WORLDWIDE FASTENER STANDARD

WX 100 2020 05 27

FINISH SPECIFICATION

1. SCOPE
The following specification covers requirements for finishes used on Worldwide Standard and Utility Parts.
Obsolete finish specifications are not shown in this standard. If a finish is referenced that is not shown in this
standard, the user should contact the local Fastener Engineering Office for direction.

2. APPLICATION
Fasteners are coated and handled in bulk processes by pouring them into perforated baskets, applying the
coating, and then pouring them out. Bulk handling and coating are cost effective and efficient for all types of
fasteners but may result in coating or thread damage each time the fasteners are transferred. For this reason,
sorting process may be beneficial at removing one defect type while causing another and should be carefully
considered. Fastener size, geometry and surface area as well as fastener orientation in the basket, load size,
and agitation during processing are major factors in the application of all finishes.

2.1 RECOMMENDED USAGE

Recommended usage included in the description of individual finishes is intended for information only.
Fastener finishes should be selected per the Global Fastener Finish Strategy. See link below:
https://pd1.spt.ford.com/sites/fasteners/Shared%20Documents/Finishes/Finish_Strategy/Finish%20Stra
tegy.pdf

Please review with the appropriate fastener engineering department when releasing finishes not included
in the Global Fastener Finish Strategy.

2.2 ELECTROPLATE
Electroplated finishes are applied by pouring the fasteners into baskets and then tumbling them in each
stage of the plating line. An electric current is passed through the electrolyte to deposit metal onto the
fastener surface. Electroplates do not cause recess fill, but coating thickness does vary by part geometry.
Electroplates do not require an oven cure, although higher hardness parts are oven baked to remove
hydrogen. Electroplates are preferred for auto feed systems due to their lack of dusting and gumming of
the feed tubes.

2.3 DIP SPIN

Dip spin finishes are applied by pouring the fasteners into a perforated basket and then immersing the
basket into a tank of liquid coating. The basket is removed and then spun to centrifugally remove excess
coating. The fasteners are then poured out and the coating cured in an oven.

2.3.1 Internally driven fasteners (recess drive), fasteners with internal cavities such as nuts, rivets,
parts with extruded closed-end holes, parts with through-holes, fasteners with fine pitch threads,
and other similar features trap excess material in the cavities, which the spinning process does
not completely remove. If the dip spin process is used to apply coatings to fasteners with these
design features, a percentage of the fasteners will have recess fill, clogged holes, bubbled
coating, and/or thread bridging. As a result, fasteners with these finishes and designs may
experience issues with form, fit, and function at the assembly plants.

2.3.2 To avoid these issues, consider applying these finishes using modern planetary rotary systems.
This process may significantly reduce recess fill, but not completely. Alternatively, consider
externally driven fastener designs or electroplated finishes.

2.3.3 Dip spin coatings may result in hydraulic lockup of loose washers or washer assemblies. Single
layer coatings may contain touch marks which can be prevented by applying the coating in two
of more layers.

2.4 MECHANICALLY DEPOSITED PLATINGS – BEAD ENTRAPMENT

Mechanical plating, also known as peen plating, mechanical deposition, or impact plating, is a plating
process that imparts the coating by cold welding fine metal particles to a workpiece. It is commonly used
to avoid the potential for hydrogen embrittlement. The process involves tumbling the workpieces with a
mixture of water, metal powder, media, and additives. The media material is usually soda lime glass or
Copyright © 2020, Ford Global Technologies, LLC Page 1 of 19
 WORLDWIDE FASTENER STANDARD

WX 100 2020 05 27

a ceramic and is usually spherical in form. Common coating materials are zinc, tin, copper, and
aluminum.

2.4.1 Internally threaded fasteners and fasteners with an integrated or free-spinning assembled
washers such as nut and washer assemblies (KEPS) or screw and washer assemblies (SEMS)
have the potential for bead entrapment in the thread form, between the assembled washer or
other part cavities, which the mechanical plating process does not completely remove. To
prevent the potential from impeding the assembly process or functionality of the fastener,
mechanical plating shall not be released on these parts. This provision applies to all thread sizes
and forms.

2.5 ELECTROCOAT
Electrocoat finishes are applied by pouring the fasteners into a basket and then immersing the basket in
a tank of liquid paint. An electric current is applied while the fasteners are tumbled and the oppositely
charged paint is deposited to the fastener surface. The sealer is applied by a dip drain process. The
fasteners are then poured out and the coating cured in an oven. Electrocoats do not usually cause recess
fill for T20 recesses and above. Lockup of washer assemblies and other flat surfaces can occur. Not
recommended for small diameter fasteners (below 4.0 mm in diameter) because their low mass may
allow parts to stick together during cure.

3. DESIGNATION

The finish required on a standard or utility part is designated by adding the appropriate finish code to the part
number as a suffix when a part is released on a program. The finish code consists of letter 'S' followed by a
number and any subsequent treatment codes (except "SSW"). The release for a standard or utility part is
incomplete without the addition of a finish code to the part number. Paragraph 6 contains the list of valid
finishes.

Fasteners are initially released on a blanket notice without a finish code. This creates the 2D drawing for utility
parts and 3D CAD models for all fasteners in the release system. This initial release allows a fastener to be
released on programs with different finishes.

3.1 DESIGNATION EXAMPLES (Limited to 8 characters by WERS)

Example: S450B S450B (none) (none)

Example: S434XC S434 XC (none)

Example: S900DA S900 (none) DA

Worldwide Finish Suffix Number (see section 6)

Subsequent Treatment
Delivery Condition

N0TE: In the past, a number "1" after the S was used to indicate that the part was to be used in an
automatic assembly application. This convention is no longer used.

SUBSEQUENT TREATMENTS are treatments such as the addition of waxes for sealing on sheet metal
screws or wax on hose clamps to lower the friction between the clamp and hose. These subsequent
treatments are specified in WSS-M21P27-A1/A2/A3/A4/A5 available at www.gma.ford.com. The
subsequent treatments are shown in Table 1.

DELIVERY CONDITIONS apply to self-piercing rivets. They describe how the parts are received from
the manufacturer and how they are fed into the assembly machine during the manufacturing process.
These delivery conditions are specified in Table 2.

Copyright © 2020, Ford Global Technologies, LLC Page 2 of 19

 WORLDWIDE FASTENER STANDARD

WX 100 2020 05 27

Table 1 Subsequent Treatment Indicator Table

Material
Treatment Spec/ Log Approved
Description Trade Name
Indicator Standard Status Suppliers
Number
Wax sealer applied to WSS-
XA N ND Industries BiSeal 0630
threads. M21P27-A1
Wax applied to the inside Doerken MKS- Delta
WSS-
XB diameter of hose clamps N Systeme Wachsemulsion
M21P27-A2
to lower friction. GMBH & Co (130640)
ND Industries ND LM-1293
Fluorocarbon polymer
based coating used on Forest City
WSS- FCMS-445A
fasteners to reduce the A Technologies
XC M21P27-A3
adhesion of Nylok Fastener
electrodeposited primers. NYCOTE
Corp.
OmniTECKNIK OmniMASK
Water based wax lubricant Forest City
FCMS402
applied to lead threads of Technologies
WSS-
XD thread rolling screws to A ND Industries EZ-DRIVE
M21P27-A4
reduce the torque required
to form threads. OmniTECHNIK Precote Top 300
Non-metallic sealer ND Industries ND500
compound applied to the WSS-
XE A Nylok Fastener
bearing surface of M21P27-A5 NYSEAL
Corp.
fasteners.

Table 2 Delivery Condition Indicator Table

Condition
Title Description
Indicator

Fasteners are received in a container in

No Suffix Bulk
loose condition via normal methods.
Fasteners are received on a returnable reel
DA Reel or spool collated by tape, wire, or similar
means.
Fasteners are received in small quantities
DB Cassette
via a cassette, magazine, or similar means.

Fasteners are received in a loose condition

DC Bottle
contained by a returnable bottle or container.

Fasteners are received on a disposable reel

DD Reel or spool collated by tape, wire, or similar
means.

Allows MP&L to separate fasteners in

DM Module CMMS when they are shared between an
assembly plant and a module builder.

Copyright © 2020, Ford Global Technologies, LLC Page 3 of 19

 WORLDWIDE FASTENER STANDARD

WX 100 2020 05 27

4. REFERENCES
AIAG CQI-11 Plating System Assessment
AIAG CQI-12 Coating System Assessment
FLTM BI 024-01 Corrosion Testing of Threaded Fastener Finishes
ISO 261 ISO general-purpose metric screw threads - General plan
ISO 898-1 Mechanical properties of fasteners - Part 1: Bolts, screws and studs
ISO 898-2 Mechanical properties of fasteners - Part 2: Nuts with specified proof load values
ISO 965-1 ISO general-purpose metric screw threads - Tolerances
ISO 4042 Clause 10 Threaded components - Electroplated coatings
ISO 6157-3 Fasteners - Surface discontinuities - Bolts, screws and studs for special
requirements
ISO 4599 Plastics, Determination of resistance to environmental stress cracking, Bent strip
method
QS-9000 Quality System Requirements
TM-00.00-L-467 Global Laboratory Accelerated Cyclic Corrosion Test
WSD-M13P7-A Lubricant-Torque/Clamping Force Control
WSS-M99A3-A Embrittlement Avoidance
WSS-M99P9999-A1 Restricted Substance Management Standard
WD 950 Material and Performance Requirements for Spaced Thread Tapping Screws
WD 951 Mechanical and Performance Requirements of Case Hardened Thread Rolling
Screws
WD 952 Mechanical and Performance Requirements Of (010) Thread Rolling Screws with
Induction Hardened Points
WD 953 Material and Performance of Screws for Use in Plastics
WD 954 Material and Performance Requirements for Screws Used in Thermoplastic
Materials
WD 956 Mechanical and Performance Requirements Of (8N) Short Point Thread Rolling
Screws for Use in Aluminum Applications
WD 957 Mechanical and Performance Requirements Of (090) Thread Rolling Screws with
Induction Hardened Points for Use as Grounding Screws or General Use
WE 955 Prevailing Torque-Type Steel Hex Nuts and Hex Flange Nuts
WE 953 Mechanical and Performance Requirements for Single Thread Spring Nuts
WX 200 Threaded Fasteners with Dry Film Microencapsulated Adhesive Applied to the
Threads
WX 201 Threaded Fasteners with Sealer Compound Applied to the Threads
WZ 100/101/102 Steel ISO Metric Threaded Fasteners Torque/Clamping Force Performance.

5. GENERAL REQUIREMENTS.

5.1 SUMMARY
Substance restrictions imposed by regulations or Company direction applies to the materials
addressed by this document. The restrictions are identified in the Restricted Substance
Management Standard WSS-M99P9999-A1 which is updated yearly. It is the supplier’s
responsibility to comply with this standard on a continuing basis through IMDS and or GMAP
reporting.

5.2 APPLICATOR SELF ASSESSMENT

AIAG CQI-11 Plating System Assessment or CQI-12 Coating System Assessment shall be
conducted annually.

5.3 PART CONDITION

Parts as supplied to Ford locations shall be completely covered with the finish specified. Parts shall also
be commercially clean and shall be free from corrosion, chips, loosely adherent metal oxides, dirt,
abrasives or other foreign material.

Copyright © 2020, Ford Global Technologies, LLC Page 4 of 19

 WORLDWIDE FASTENER STANDARD

WX 100 2020 05 27

5.4 EMBRITTLEMENT AVOIDANCE

All components shall comply with the requirements of WSS-M99A3-A with the exception of
• Spaced thread tapping screws per WD 950, WD 954, or ISO 2702 are not required to be cleaned
prior to heat treatment.
• Spaced thread tapping screws per WD 950 may be electroplated.
• Bolt retainers / push on nuts per WE 600 may be electroplated.
• Thread rolling screws per WD 952 used in grounding cable/wire/strap applications may be
electroplated with S450 or S450L.
• Rivet mandrels may be electroplated, see WG 950

5.5 PROTECTIVE FINISHES ON THREADS

Bolt threads with relatively thick coatings (e.g. greater than 8 micrometers) whose thread form is in
accordance with ISO 261 may require additional allowance to accommodate the coating. The thread
dimensions before coating shall be determined by the supplier and shall be manufactured within tolerance
class 6 limits. The thread allowance shall be limited by the upper deviation of tolerance class 6g (es) and
the lower deviation of tolerance class 6e (ei).
Note 1. Not applicable to thread rolling screws that make their own threads.
Note 2: This allows the manufacturer to size the parts anywhere within the total tolerance span of class
6g (es) through 6e (ei). To minimize deviation within a lot, the lot shall be limited to a tolerance grade 6.
See ISO 965-1 for information regarding thread tolerances.
After plating/coating the threads shall meet the requirements of tolerance class 6h using a solid GO screw
ring gauge. Based upon ISO 6157-3 for acceptability of thread damage after plating/coating, the torque
applied to the solid GO screw ring gauge shall not exceed 0.001d3 Nm, except for dip spin coatings which
shall not exceed 0.0015d3 Nm. Where d is the nominal thread diameter in millimeters.
Nut threads shall be manufactured to 6H tolerance. When coated with zinc flake type coatings tightness
to thread inspection gauges may be experienced, however, the coating thickness shall not adversely
affect the mechanical performance of the nut or have an adverse effect on normal installation practices.
Zinc flake coated nuts shall be tested using an uncoated (or zinc plated) 6g bolt. The nut shall engage
on the bolt by hand, the maximum prevailing torque measured over a minimum of 1.5 turns (540°) shall
not exceed 1 Nm.

5.6 TEST METHODS - SPECIAL REQUIREMENTS FOR FASTENERS

Requirements defined in the material engineering specification apply to parts as received by Ford and
shall be evaluated using the following test methods and definitions as applicable.

5.6.1 SIGNIFICANT SURFACES

Significant surfaces are those surfaces visible on a part as normally assembled or surfaces that
can be a source of corrosion products visible on an assembled vehicle. Significant surfaces are
used when assessing corrosion.

5.6.2 COATING THICKNESS

Threads, sharp edges, crevices, holes, slots and recesses shall not be used for coating thickness
measurement.

5.6.3 CYCLIC CORROSION TESTING

The corrosion requirements and recommended test frequency are found in the material
specification listed for each finish. Values reproduced here are for convenience and are typically
based on coated hex flange bolts attached to e-coated steel panels and rated in accordance with
FLTM BI 024-01. Cyclic corrosion will eventually replace salt spray testing for all finishes.

5.6.4 WASHER ADHESION

Free spinning washers on bolt and washer assemblies may no longer remain free spinning after
application of electro-coated or dip spin finishes. These washers typically become free spinning
during handling or during the installation process. Stuck washers should separate with moderate
hand pressure.

Copyright © 2020, Ford Global Technologies, LLC Page 5 of 19

 WORLDWIDE FASTENER STANDARD

WX 100 2020 05 27

5.6.5 TORQUE TENSION PERFORMANCE

ISO general purpose metric screw threaded steel fasteners whose thread form is in accordance
with ISO 261 and/or whose material and performance requirement reference ISO 898-1 or 898-2
shall meet torque/clamping force as specified, e.g, WZ 101, Prevailing Torque Nuts WE 955. For
production control, data for torque / clamping force or friction coefficient can be measured on similar
parts coated with the same finish. In case of dispute, the referee test method shall be as specified
in the engineering material specification for that finish.

6. DETAILED FINISH DESCRIPTIONS

SSW IN WHITE (COLOR KEYED) PARTS

When Standard or Utility parts are designated "In White" and are therefore required to comply with a color chart
or master sample, they shall be released with the suffix SSW.

S300 PLAIN: No coating or finish other than the normal result of manufacturing processes for the material
and product involved.

Specifications: Not applicable

Approved Source: Not Applicable
Coating Process: Not applicable
Total Thickness: Not applicable
Lubricant: When applicable per Special Requirements.
Friction Coefficient: If applicable per Special Requirements below. µ =0.15 +/-0.03 per WZ 101 Program
B using test surfaces per WZ 100.
Color: Not applicable
Corrosion Protection: See paragraph 5.3 (part condition) for FCSD requirements
Service Temperature: Not applicable
Tox Number:

Special Requirements: Threaded parts may be oiled/lubricated as part of the normal process to meet the
requirements for torque/clamping force specified in WZ 100. The following parts
shall not be lubricated: Weld, Pierce, Clinch, Tapping Screws WD 950/953/954, and
Single Threaded Spring Nuts WE 953. Rust inhibitors may be used on metal
fasteners as part of the normal manufacturing process to keep them rust free during
normal transport and delivery.
Recommended Usage: Generally used on aluminum rivets, plastic fasteners and weld, bolts and nuts for
“Body in White” applications.

S303 BLACK ORGANIC CORROSION PROTECTION COATING

Specification: WSD-M21P10-B2
Approved Source: Multiple (See iPoint Approval approved source list)
Coating Process: Dip Spin or Electrophoresis. One base coat.
Total Thickness: 5.0 micrometers min.; 15 – 20 micrometers typical
Lubricant: Integral friction modifiers in topcoat. No additional waxes, lubricants or torque
tension fluids are necessary.
Friction Coefficient: µ =0.15 +/-0.03 per WZ101 Program B using test surfaces per WZ100.
Color: Black
Salt Spray Corrosion: 120 hour salt spray
Service Temperature: 175 °C
Tox Number:
Special Requirements: If a lubrication process is required to satisfy this requirement, it will be an integral
dry self-lubrication system. See section 2.3.1 on recess fill.
Recommended Usage: Generally used on externally driven screws for interior applications. Not
recommended for nuts.

Copyright © 2020, Ford Global Technologies, LLC Page 6 of 19

 WORLDWIDE FASTENER STANDARD

WX 100 2020 05 27

S307 BLACK ZINC ORGANIC CORROSION PROTECTION COATING

Specification: WSD-M21P11-B2
Approved Source: Doerken MKS Delta-Protekt KL100 / Delta-Seal GZ Schwarz
Doerken MKS Delta-Tone 9000 / Delta-Seal GZ Schwarz
Magni: Dorrlflake/Magniseal or B06JA / B15
Coating Process: Dip Spin.
Total Thickness: 11.0 micrometers, min.; 12 – 20 micrometers typical
Basecoat: 7µm min Topcoat: 4 µm
Lubricant: Integral friction modifiers in topcoat. No additional waxes, lubricants or torque
tension fluids are necessary.
Friction Coefficient µ =0.13 +/-0.03 per WZ 102.
Color: Black
Cyclic Corrosion: 3 weeks white corrosion, 3 weeks red corrosion
Service Temperature: 200 - 230 °C Intermittent, 150 - 180 °C Continuous
Tox Number:
Special Requirements: See paragraph 2.3.1 on recess fill.
Recommended Usage: Generally used on clips and externally driven bolts or screws for exterior
applications where black color is required. Not recommended for nuts. Due to
hydraulic lock up in processing, parts which may be mated, i.e., flat washers, hex
flange nuts, etc. should not use this finish.

S403 COPPER PLATE: This finish is an electroplated or mechanically plated copper coating.

Specification: None
Approved Source: Any Reliable Supplier
Coating Process: Typically electroplating, one base layer
Total Thickness: 2.5 micrometers, min.
Lubricant: None
Friction Coefficient: Not Applicable
Color: Copper
Corrosion Protection: No inherent corrosion resistant qualities
Service Temperature: 250 °C
Tox Number:
Special Requirements: None
Recommended Usage: Used on weld studs for “Body in White” applications. Sometimes used on high
temperature stainless steel applications to prevent galling.

S417 ANODIZING - BLACK: This finish is an organically colored anodize over aluminum or aluminum alloy.

Specification: None
Approved Source: Any Reliable Supplier
Coating Process: Anodizing
Total Thickness: 2.5 micrometers, min.
Lubricant: None
Friction Coefficient: Not Applicable.
Color: Black
Corrosion Protection: Not applicable.
Service Temperature: Same as Aluminum alloy used
Tox Number:
Special Requirements: None
Recommended Usage: Used on aluminum bodied rivets where black color is required. Not for use where
electrical conductivity is required of finish.

Copyright © 2020, Ford Global Technologies, LLC Page 7 of 19

 WORLDWIDE FASTENER STANDARD

WX 100 2020 05 27

S430 PHOSPHATE AND LUBRICANT (NOT FOR NEW DESIGN)

This finish consists of a zinc iron or manganese iron phosphate coating plus a specified approved lubricant.

Specification: WSD-M3P35-A1/A2 and WSD-M21P19-A30 (for approved lubricants)

Approved Source: PPG Industries Inc. – Rustarest 260 or 53253
Coating Process: Barrel process, chemical deposition
Total Thickness: Not applicable
Lubricant: ISO general purpose metric screw threaded steel fasteners whose thread form is in
accordance with ISO 261 and/or whose material and performance requirement
reference ISO 898-1 or 898-2 shall be lubricated with a specified approved lubricant
which meets the requirements of WZ 100.
Friction Coefficient: µ =0.15 +/-0.03 per WZ101 Program B using test surfaces per WZ100.
Color: Black
Corrosion Protection: None
Service Temperature: 50 °C
Tox Number: NA: 175008, 185597
Special Requirements: Coated parts offer no corrosion protection and should only be used for internal
applications where corrosion protection is not a requirement. Fasteners that do not
fully conform to the aforementioned requirements shall not use this finish suffix.
Recommended Usage: Used on externally driven screws for internal engine and transmission applications
for the control of torque/clamping force performance. Not recommended for new
design. Replaced by S452.

S431 METALLIC GRAY CORROSION PROTECTIVE COATING (SEE S453)

This finish is a water-dilutable aluminum filled chromate/phosphate compound which requires an oven baking
cycle to cure and will have a uniform metallic gray appearance after full processing. The process consists of
cleaning the components by abrasive blasting followed by two coats of the aluminum-filled compound applied
by the dip spin process and curing at a nominal temperature of 340 °C. The surface is then burnished using
glass beads and then lubricated with a dry to the touch wax lubricant.

Specification: WSD-M21P19-A31
Approved Source: Sermatech International – Sermagard 902 + Sermalube 1127
Coating Process: Dip Spin, basecoat applied 2 times + lubricated topcoat
Total Thickness: 15.0 - 20.0 micrometers for threaded components
Lubricant: Dry to the touch wax lubrication
Friction Coefficient: µ =0.15 +/-0.03 per WZ101 Program B using test surfaces per WZ100.
Color: Gray
Salt Spray Corrosion: 408 hour salt spray
Service Temperature: Maximum of 645 °C
Tox Number:
Special Requirements: Limited global availability. See paragraph 2.3.1 on recess fill.
Recommended Usage: Used on externally driven bolts or screws for high temperature engine and
transmission applications. Not recommended for nuts or other internally threaded
parts and parts released for Final Assembly. Intended to be replaced by S453

S434 ZINC PLATE: This finish is zinc electroplate followed by a clear trivalent chromate treatment.

Specification: WSS-M1P85-B1
Approved Source: Any Reliable Supplier
Coating Process: Electroplating. Base layer + trivalent chromate
Total Thickness: 5.0 to 11.0 micrometers
Lubricant: None
Friction Coefficient: Not Applicable.
Color: Silver
Cyclic Corrosion: White corrosion starts < 1 week, 1 week for red corrosion,
Service Temperature: 90 °C, max
Tox Number:
Copyright © 2020, Ford Global Technologies, LLC Page 8 of 19
 WORLDWIDE FASTENER STANDARD

WX 100 2020 05 27

Special Requirements: Part shall not be supplied in an oiled condition.

Recommended Usage: Used on small semi-tubular rivets (M3.5 and smaller) or pierce/clinch nuts or studs
used in steel panels for “Body in White” applications where corrosion protection for
material handling is required. It is not to be used on general purpose ISO metric
threaded steel fasteners.

S437 ELECTROLYTIC ZINC PLATE, TRIVALENT CHROMATE, AND CLEAR SEALER, INTEGRAL
TORQUE CONTROL LUBRICANT

Specification: WSS-M21P52-A2
Approved Source: MacDermid Inc. - Zinklad 250 (TnT 15 topcoat)
Coating Process: Electroplating. Base layer, trivalent chromate, sealer
Total Thickness: 8.0 to 14.0 micrometers
Lubricant: The clear sealer contains an integral torque control lubricant. No additional
lubrication is necessary.
Friction Coefficient: µ =0.15 +/-0.03 per WZ101 Program B using test surfaces per WZ100.
Color: Silver
Cyclic Corrosion: 1 week for white corrosion, 4 weeks for red corrosion
Service Temperature: 120 °C
Tox Number: NA: 195518
Special Requirements: none.
Recommended Usage: Generally used on bolts, screws and nuts for engine, transmission, interior and
“Body in White” applications. Also used on low hardness washers where hydrogen
embrittlement is not a concern. Not recommended for severe abrasion conditions
or where chip resistance is required.

S437M MECHANICAL ZINC PLATE, TRIVALENT CHROMATE, AND CLEAR SEALER, INTEGRAL
TORQUE CONTROL LUBRICANT

Specification: WSS-M21P52-A3
Approved Source: MacDermid Inc. - Zinklad 250M (TnT 15 topcoat)
Coating Process: Mechanical plating using beads. Base layer + trivalent chromate + sealer
Total Thickness: 8.0 to 14.0 micrometers
Lubricant: The clear sealer contains an integral torque control lubricant. No additional
lubrication is necessary.
Friction Coefficient: µ =0.15 +/-0.03 per WZ101 Program B using test surfaces per WZ100.
Color: Silver
Cyclic Corrosion: 1 week for white corrosion, 3 weeks for red corrosion
Service Temperature: 120 °C
Tox Number: NA: 195517
Special Requirements: none.
Recommended Usage: Generally used on thread forming screws with internal recess drives for interior and
“Body in White” applications and hardened washers where hydrogen embrittlement
is a concern. Not recommended for severe abrasion conditions, where chip
resistance is required or applications referenced in paragraph 2.4.1.

S437U ELECTROLYTIC ZINC PLATE AND TRIVALENT CHROMATE

Specification: WSS-M21P52-A1
Approved Source: MacDermid Inc. - Zinklad 96
Coating Process: Electroplating. Base layer + trivalent chromate
Total Thickness: 8.0 to 14.0 micrometers
Lubricant: None
Friction Coefficient: Not applicable
Color: Silver
Cyclic Corrosion: 1 week for white corrosion, 2 weeks for red corrosion
Service Temperature: 120 °C
Tox Number: NA: 195520
Copyright © 2020, Ford Global Technologies, LLC Page 9 of 19
 WORLDWIDE FASTENER STANDARD

WX 100 2020 05 27

Special Requirements: Parts shall not be supplied in oiled or lubricated condition.

Recommended Usage: Used on steel bodied rivets for interior applications or engine cup plugs with an
applied sealant. Not recommended for threaded fasteners, severe abrasion
conditions or where chip resistance is required.

S437L ELECTROLYTIC ZINC PLATE, TRIVALENT CHROMATE, AND CLEAR SEALER, ENHANCED
INTEGRAL TORQUE CONTROL LUBRICANT

Specification: WSS-M21P52-A4
Approved Source: MacDermid Inc. - Zinklad 250 (TnT 08 topcoat)
Coating Process: Electroplating. Base layer + trivalent chromate + sealer
Total Thickness: 8.0 to 14.0 micrometers
Lubricant: The clear sealer contains an integral enhanced torque control lubricant. No
additional lubrication is necessary.
Friction Coefficient: µ =0.08 +/- 0.03 per WZ101 Program B using test surfaces per WZ100.
Color: Silver
Cyclic Corrosion: 1 week for white corrosion, 4 weeks for red corrosion
Service Temperature: 120 °C
Tox Number: 195516
Special Requirements: none.
Recommended Usage: Used on thread forming screws per WD 956 for engine and transmission
applications into aluminum or threaded fasteners requiring enhanced lubricity. Not
recommended for severe abrasion conditions or where chip resistance is required.

S439 CORROSION PROTECTIVE COATING, ALUMINUM ORGANIC TYPE

This finish is an organic coating over an inorganic zinc rich basecoat.

Specification: WSS-M21P37-A1
Approved Source: Magni Group Inc. – Magni 565 (B06JA or B46 + B18)
Coating Process: Dip Spin. Basecoat + topcoat
Total Thickness: 12.0 micrometers, min.; 13 – 18 micrometers typical
Lubricant: Integral friction modifiers in topcoat. No additional waxes, lubricants or torque
tension fluids are necessary.
Friction Coefficient: µ = 0.14 ±0.03 per WZ 102.
Color: Silver
Cyclic Corrosion: 6 weeks for white corrosion, 6 weeks for red corrosion.
Service Temperature: Not to exceed 260 °C
Tox Number: NA: 159883
Special Requirements: The cure temperature may degrade non-metallic inserts in prevailing torque nuts,
see WE 955. Additionally, it should not be applied to parts in contact with uncoated
copper or stainless steel surfaces. See paragraph 2.3.1 on recess fill.
Recommended Usage: Generally used on clips, spring nuts and externally driven bolts or screws for exterior
and interior applications. Not recommended for nuts or recessed drive screws. Due
to hydraulic lock up in processing, parts which may be mated, i.e., flat washers, hex
flange nuts, etc. should not use this finish.

S439B CORROSION PROTECTIVE COATING, ALUMINUM ORGANIC TYPE

This finish is an organic coating over an inorganic zinc rich basecoat.

Specification: WSS-M21P37-A4
Approved Source: Magni Group Inc. – Magni 565 Black (B06JA or B46 + B37 + B37)
Coating Process: Dip Spin. Basecoat + topcoat 2 times.
Total Thickness: 12.0 micrometers, min.; 13 – 18 micrometers typical
Lubricant: Integral friction modifiers in topcoat. No additional waxes, lubricants or torque
tension fluids are necessary.
Friction Coefficient: µ = 0.14 ±0.03 per WZ 102.
Color: Black
Cyclic Corrosion: 6 weeks for white corrosion, 6 weeks for red corrosion.
Copyright © 2020, Ford Global Technologies, LLC Page 10 of 19
 WORLDWIDE FASTENER STANDARD

WX 100 2020 05 27

Service Temperature: Not to exceed 260 °C

Tox Number:
Special Requirements: The cure temperature may degrade non-metallic inserts in prevailing torque nuts,
see WE 955. Additionally, it should not be applied to parts in contact with uncoated
copper, magnesium or stainless steel surfaces. See paragraph 2.3.1 on recess fill.

Recommended Usage: Generally used on clips, spring nuts and externally driven bolts or screws for exterior
and interior applications. Not recommended for nuts or recessed drive screws. Due
to hydraulic lock up in processing, parts which may be mated, i.e., flat washers, hex
flange nuts, etc. should not use this finish.

S439T (BLUE) CORROSION PROTECTIVE COATING, ALUMINUM ORGANIC TYPE

This finish is an organic coating over an inorganic zinc rich basecoat.

Specification: WSS-M21P37-A5
Approved Source: Magni Group Inc. – Magni 565 Blue (B06JA or B46 + B18BL)
Coating Process: Dip Spin. Basecoat + topcoat
Total Thickness: 12.0 micrometers, min.; 13 – 18 micrometers typical
Lubricant: Integral friction modifiers in topcoat. No additional waxes, lubricants or torque
tension fluids are necessary.
Friction Coefficient: µ = 0.14 ±0.03 per WZ 102.
Color: Blue
Cyclic Corrosion: 6 weeks for white corrosion, 6 weeks for red corrosion.
Service Temperature: Not to exceed 260 °C
Tox Number:
Special Requirements: The cure temperature may degrade non-metallic inserts in prevailing torque nuts,
see WE 955. Additionally, it should not be applied to parts in contact with uncoated
copper or stainless steel surfaces. See paragraph 2.3.1 on recess fill.
Recommended Usage: Generally used on clips, spring nuts and externally driven bolts or screws for exterior
and interior applications. Not recommended for nuts or recessed drive screws. Due
to hydraulic lock up in processing, parts which may be mated, i.e., flat washers, hex
flange nuts, etc. should not use this finish.

S439LH CORROSION PROTECTIVE COATING, ALUMINUM ORGANIC TYPE

This finish is an organic coating over an inorganic zinc rich basecoat.

Specification: WSS-M21P37-A6
Approved Source: Magni Group Inc. – Magni 568 (B06JA + B06JA+ B18LH)
Coating Process: Dip Spin. Basecoat 2 times + top coat
Total Thickness: 13.0 micrometers, min.; 15 – 22 micrometers typical
Lubricant: Integral friction modifiers in topcoat. No additional waxes, lubricants or torque
tension fluids are necessary.
Friction Coefficient: µ = 0.09 ±0.03 per WZ 102.
Color: Silver with a pink hue
Cyclic Corrosion: 9 weeks for white corrosion, 9 weeks for red corrosion.
Service Temperature: Not to exceed 260 °C
Tox Number:
Special Requirements: The cure temperature may degrade non-metallic inserts in prevailing torque nuts,
see WE 955. Additionally, it should not be applied to parts in contact with uncoated
copper or stainless steel surfaces. See paragraph 2.3.1 on recess fill.
Recommended Usage: Used on large diameter >M16 bolts or nuts to reduce drive torque within tool limits.
Not recommended for general use or single shear applications. Due to hydraulic
lock up in processing, parts which may be mated, flat washers, etc. should not use
this finish.

Copyright © 2020, Ford Global Technologies, LLC Page 11 of 19

 WORLDWIDE FASTENER STANDARD

WX 100 2020 05 27

S440 CORROSION PROTECTIVE COATING, ALUMINUM ORGANIC TYPE

This finish is an organic coating applied over an electrolytic zinc base coat.

Specification: WSS-M21P40-A1
Approved Source: Magni Group Inc. – Magni 560 (zinc plate + trivalent Cr + B18)
Coating Process: Electroplate + Trivalent Chromate + Dip spin topcoat
Total Thickness: 11.0 micrometers, min.; 12 – 16 micrometers typical
Zinc plate: 6 µm min Topcoat: 5 µm min
Lubricant: Integral friction modifiers in topcoat. No additional waxes, lubricants or torque
tension fluids are required.
Friction Coefficient: µ = 0.15 ±0.03 Per WZ101 Program B.
Color: Gray/Silver
Cyclic Corrosion: 1 week for white corrosion, 3 weeks for red corrosion
Service Temperature: Not to exceed 260 °C
Tox Number: NA: 164880
Special Requirements: The cure temperature may degrade non-metallic inserts in prevailing torque nuts,
see WE 955. See paragraph 2.3.1 on recess fill. Additionally, it should not be
applied to parts in contact with uncoated copper, magnesium or stainless steel
surfaces.
Recommended Usage: Generally used on nuts with nonmetallic insert for exterior and interior applications.

S440M CORROSION PROTECTIVE COATING, ALUMINUM ORGANIC TYPE

This finish is an organic coating applied over a mechanically plated zinc base coat.

Specification: WSS-M21P40-A2
Approved Source: Magni Group Inc. – Magni 560M (zinc plate + trivalent Cr + B18)
Coating Process: Mechanical plating using beads +Trivalent chromate + Dip spin topcoat
Total Thickness: 11.0 micrometers, min.; 12 – 16 micrometers typical
Lubricant: Integral friction modifiers in topcoat. No additional waxes, lubricants or torque
tension fluids are required.
Friction Coefficient: µ = 0.15 ±0.03 Per WZ101 Program B.
Color: Gray/Silver
Salt Spray Corrosion: 240 hours salt spray for zinc corrosion, 840 hours salt spray for ferrous corrosion.
Service Temperature: Not to exceed 260 °C
Tox Number: NA: 164880
Special Requirements: The cure temperature may degrade non-metallic inserts in prevailing torque nuts,
see WE 955. Additionally, it should not be applied to parts in contact with uncoated
copper, magnesium or stainless steel surfaces.
Recommended Usage: Used on threaded fasteners for exterior applications where there is a concern for
hydrogen embrittlement. Not recommended for applications referenced in
paragraph 2.3.1.

S442 CORROSION PROTECTIVE COATING, ZINC/ALUMINUM BASECOAT, LUBRICATED TOPCOAT

This finish is a micro layer corrosion protection system consisting of a high zinc and aluminum containing
inorganic basecoat with and aqueous inorganic topcoat that provides lubricity for consistent torque tension
control. It is free of chromium, nickel, and lead.

Specification: WSS-M21P42-A3
Approved Source: Doerken MKS-Systeme GMBH & Co KG – Delta-Protekt KL100 and VH 302 GZ
Coating Process: Dip Spin. Basecoat + Topcoat
Total Thickness: 9.0 micrometers, min.; 10 – 14 micrometers typical
Lubricant: Integral friction modifiers in topcoat. No additional waxes, lubricants or torque
tension fluids are necessary.
Friction Coefficient: µ = 0.12 ±0.03 Per WZ 102
µ = 0.14 ±0.03 Per WZ 101 Program B.
Color: Silver
Cyclic Corrosion: 6 weeks for white corrosion, 6 weeks for red corrosion
Copyright © 2020, Ford Global Technologies, LLC Page 12 of 19
 WORLDWIDE FASTENER STANDARD

WX 100 2020 05 27

Service Temperature: Not to exceed 260 °C

Tox Number: 170303
Special Requirements: The cure temperature may degrade non-metallic inserts in prevailing torque nuts,
see WE 955. See paragraph 2.3.1 on recess fill. Additionally, it should not be applied
to parts in contact with uncoated copper, magnesium or stainless steel surfaces.
Recommended Usage: Generally used on nuts and externally driven bolts or screws for exterior and interior
applications. Not recommended for recessed drive screws. Due to hydraulic lock
up in processing, parts which may be mated, i.e., flat washers, should not use this
finish.

S444 SILVER/SILVER GRAY CORROSION PROTECTIVE COATING:

This finish is a proprietary corrosion protection coating which is low temperature heat cured.

Specification: WSS-M21P45-A1
Approved Source: Multiple (See iPoint Approval approved source list)
Coating Process: Dip Spin. See ASL for basecoat and topcoat details
Total Thickness: Not Applicable
Lubricant: Integral friction modifiers in topcoat. Friction Coefficient < 0.18.
Color: Silver/Silver Gray
Cyclic Corrosion: 1 week for white corrosion, 4 weeks for red corrosion
Salt Spray Corrosion: 120 hours salt spray to zinc corrosion, 480 hours salt spray to ferrous corrosion.
Service Temperature: Maximum of 200 °C
Tox Number:
Special Requirements: Not to be used for applications other than hose clamps.
Recommended Usage: Used on spring band hose clamps.

S444H SILVER/SILVER GRAY CORROSION PROTECTIVE COATING:

This finish is a proprietary corrosion protection coating which is low temperature heat cured.

Specification: WSS-M21P45-A3
Approved Source: Praxair Surface Technologies - NGC-1695
Coating Process: Dip Spin. See ASL for basecoat and topcoat details
Total Thickness: Not Applicable
Lubricant: Integral friction modifiers in topcoat. Friction Coefficient < 0.18.
Color: Silver/Silver Gray
Cyclic Corrosion: 8 weeks for ferrous corrosion
Salt Spray Corrosion: 1000 hours for ferrous corrosion
Service Temperature: Maximum of 200 °C
Tox Number: 196586
Special Requirements: Not to be used for applications other than hose clamps. Due to the potential for
stress corrosion cracking, clamps equal to or greater than 35 mm diameter the
hardness shall not be higher than 530 HV. For clamps less than 35 mm
diameter, no hardness limit is required.
Recommended Usage: Used on spring band hose clamps.

S445 BLACK CORROSION PROTECTIVE COATING:

This finish is a proprietary corrosion protection coating which is low temperature heat cured.

Specification: WSS-M21P45-A2
Approved Source: Multiple (See iPoint Approval approved source list)
Coating Process: Dip Spin. See ASL for basecoat and topcoat details
Total Thickness: Not Applicable
Lubricant: Integral friction modifiers in topcoat. Friction Coefficient < 0.18.
Color: Black
Cyclic Corrosion: 1 week for white corrosion, 4 weeks for red corrosion
Salt Spray Corrosion: 120 hours salt spray to zinc corrosion, 480 hours salt spray to ferrous corrosion.
Service Temperature: Maximum of 200 °C
Tox Number:
Copyright © 2020, Ford Global Technologies, LLC Page 13 of 19
 WORLDWIDE FASTENER STANDARD

WX 100 2020 05 27

Special Requirements: Not to be used for applications other than hose clamps.
Recommended Usage: Used on spring band hose clamps where black color is required.

S445H BLACK CORROSION PROTECTIVE COATING:

This finish is a proprietary corrosion protection coating which is low temperature heat cured.

Specification: WSS-M21P45-A4
Approved Source: Praxair Surface Technologies - NGC-1694
Coating Process: Dip Spin. See ASL for basecoat and topcoat details
Total Thickness: Not Applicable
Lubricant: Integral friction modifiers in topcoat. Friction Coefficient < 0.18.
Color: Black
Cyclic Corrosion: 8 weeks for ferrous corrosion
Salt Spray Corrosion: 1000 hours for ferrous corrosion
Service Temperature: Maximum of 200 °C
Friction Coefficient: Not Applicable.
Tox Number: 196587
Special Requirements: Not to be used for applications other than hose clamps. Due to the potential for
stress corrosion cracking, clamps equal to or greater than 35mm diameter the
hardness shall not be higher than 530 HV. For clamps less than 35mm
diameter, no hardness limit is required.
Recommended Usage: Used on spring band hose clamps.

S450 ELECTROLYTIC ZINC-NICKEL PLATE, TRIVALENT CHROMATE, AND CLEAR SEALER,

INTEGRAL TORQUE CONTROL LUBRICANT

Specification: WSS-M21P51-A2
Approved Source: MacDermid Inc. - Zinklad 1000 (TnT 12) coating
Coventya Inc. Performa 285 + Finidip 128 + Finigard 105
Coating Process: Electroplating. Base layer +Trivalent chromate + Sealer
Total Thickness: 8.0 to 14.0 micrometers
Lubricant: The clear sealer contains an integral torque control lubricant. No additional
lubrication is necessary.
Friction Coefficient: µ = 0.14 ±0.03 Per WZ 101 Program B using test surfaces per WZ 100.
Color: Silver
Cyclic Corrosion: 1 week for zinc corrosion, 9 weeks for ferrous corrosion
Service Temperature: 310 °C
Tox Number: 187212 - MacDermid
193895 - Coventya
Special Requirements: none.
Recommended Usage: Generally used on bolts or screws with internal recess drives, nuts and steel bodied
rivets for exterior applications (for blind rivets refer to S450U). Used on pierce/clinch
nuts or studs in aluminum panels for “Body in White” applications where corrosion
protection for material handling is required. Also used on low hardness washers and
grounding applications for exterior applications where hydrogen embrittlement is not
a concern.

S450L ELECTROLYTIC ZINC-NICKEL PLATE, TRIVALENT CHROMATE, AND CLEAR SEALER,

ENHANCED INTEGRAL TORQUE CONTROL LUBRICANT

Specification: WSS-M21P51-A3
Approved Source: MacDermid Inc. - Zinklad 1000 (TnT 08) coating
Coventya Inc. Performa 285 + Finidip 128 + Finigard 111
Coating Process: Electroplating. Base layer +Trivalent chromate + Sealer
Total Thickness: 8.0 to 14.0 micrometers.
Lubricant: The clear sealer contains an enhanced integral torque control lubricant. No
additional lubrication is necessary.
Friction Coefficient: µ = 0.11 ±0.03 Per WZ101 Program B using test surfaces per WZ 100.
Copyright © 2020, Ford Global Technologies, LLC Page 14 of 19
 WORLDWIDE FASTENER STANDARD

WX 100 2020 05 27

Color: Silver
Cyclic Corrosion: 1 week for zinc corrosion, 9 weeks for ferrous corrosion
Service Temperature: 310 °C
Tox Number: 187211 - MacDermid
193894 - Coventya
Special Requirements: none.
Recommended Usage: Used on thread forming screws per WD 952 for grounding applications where
enhanced lubricity is required and hydrogen embrittlement is not a concern.

S450B ELECTROLYTIC ZINC-NICKEL PLATE, BLACK TRIVALENT CHROMATE, AND CLEAR SEALER,
INTEGRAL TORQUE CONTROL LUBRICANT

Specification: WSS-M21P51-A5
Approved Source: MacDermid Inc. - Zinklad 1000B (TnT 12) coating
Coventya Inc. Performa 285 + Finidip 728.3 + Finigard 105
Coating Process: Electroplating. Base layer +Trivalent chromate + Sealer
Total Thickness: 8.0 to 14.0 micrometers.
Lubricant: The clear sealer contains an integral torque control lubricant. No additional
lubrication is necessary.
Friction Coefficient: µ = 0.14 ±0.03 Per WZ101 Program B using test surfaces per WZ 100.
Color: Black
Cyclic Corrosion: 1 week for zinc corrosion, 9 weeks for ferrous corrosion
Service Temperature: 310 °C
Tox Number: 187216 - MacDermid
193893 - Coventya
Special Requirements: none.
Recommended Usage: Generally used on bolts or screws with internal recess drives, nuts and steel bodied
rivets for exterior applications where black color is required. Also used on low
hardness washers for exterior applications where hydrogen embrittlement is not a
concern.

S450BL ELECTROLYTIC ZINC-NICKEL PLATE, BLACK TRIVALENT CHROMATE, AND CLEAR

SEALER, ENHANCED INTEGRAL TORQUE CONTROL LUBRICANT

Specification: WSS-M21P51-A6
Approved Source: MacDermid Inc. - Zinklad 1000B (TnT 08) coating
Coventya Inc. Performa 285 + Finidip 728.3 + Finigard 111
Coating Process: Electroplating. Base layer +Trivalent chromate + Sealer
Total Thickness: 8.0 to 14.0 micrometers.
Lubricant: The clear sealer contains an enhanced integral torque control lubricant. No
additional lubrication is necessary.
Friction Coefficient: µ = 0.11 ±0.03 Per WZ101 Program B using test surfaces per WZ 100.
Color: Black
Cyclic Corrosion: 1 week for zinc corrosion, 9 weeks for ferrous corrosion
Service Temperature: 310 °C
Tox Number: 187215 - MacDermid
193891 - Coventya
Special Requirements: none.
Recommended Usage: Generally used on bolts or screws with internal recess drives and nuts for exterior
applications where enhanced lubricity and black color is required.

Copyright © 2020, Ford Global Technologies, LLC Page 15 of 19

 WORLDWIDE FASTENER STANDARD

WX 100 2020 05 27

S450U ELECTROLYTIC ZINC-NICKEL PLATE, TRIVALENT CHROMATE

Specification: WSS-M21P51-A1
Approved Source: MacDermid Inc. – Enviralloy Ni 12-15 + Chromax ELV
MacDermid Inc. – Enviralloy Ni 12-15 + Tripass ELV 2000
Coventya Inc. Performa 285 + Finidip 128
Coating Process: Electroplating. Base layer +Trivalent chromate
Total Thickness: 8.0 to 14.0 micrometers
Lubricant: No additional sealer or lubrication.
Friction Coefficient: Not applicable
Color: Silver
Cyclic Corrosion: 1 week for zinc corrosion, 6 weeks for ferrous corrosion
Service Temperature: 310 °C
Tox Number: NA: 187213 – MacDermid
NA: 193895 - Coventya
Special Requirements: Parts shall not be supplied in oiled or lubricated condition.
Recommended Usage: For painted parts as deleted torque tension sealer does not interfere with paint
adhesion. Used on non-threaded parts or pierce/clinch nuts or studs in aluminum
panels for “Body in White” applications where corrosion protection for material
handling is required.

S451 BLACK ORGANIC CORROSION PROTECTION COATING

This finish is a black organic protective coating plus a sealer coating.

Specification: WSS-M21P41-A2
Approved Source: PPG Industries Inc. Powercron XP Bath + Sealcoat S424 S/B
Coating Process: Electrophoresis. E-coat + sealer
Total Thickness: 12.5 to 20.0 micrometers
Lubricant: Friction Modified Sealer
Friction Coefficient: u=0.11 +/-0.03 per WZ101 Program B.
Color: Black
Cyclic Corrosion: 1 day (Showroom) for ferrous corrosion
Service Temperature: 260 ⁰C
Tox Number: 189362 – Powercron XP
189654 - Sealcoat
Special Requirements: The sealer is a water based corrosion protection fluid; it shall be dry to the touch.
For initial sample/Engineering Approval only, sealers used for this finish shall not
cause a stress cracking concern when tested against commonly used nonmetallic
materials. The test shall be in accordance with ISO 4599.
Recommended Usage: Generally used on small diameter screws for interior applications where recess fill
is a concern. The application of the sealcoat will result in a small percentage of
parts which will have retained coating build-up in recessed areas. Also used on
spring type “U” nuts and steel clips or other interior parts where hydrogen
embrittlement is a concern. Hydraulic lockup or significant touch marks may occur
in processing parts which may be mated, i.e., flat washers, hex flange nuts, etc.
Recommended replacement for S424.

S452 PHOSPHATE AND OIL LUBRICANT

This finish consists of a zinc phosphate coating plus a specified approved oil lubricant.

Specification: WSS-M3P39-A1
Approved Source: Any reliable supplier with approval of Powertrain Fastener Engineering at the time
of PPAP. Each supplier must keep an approved source list for lubricating oil and
use the SREA process for changes. Approved source list for material specification
is not used or maintained.
Coating Process: Barrel process. Chemical deposition
Total Thickness: 2 – 6 micrometers typical (ISO 3497)
Copyright © 2020, Ford Global Technologies, LLC Page 16 of 19
 WORLDWIDE FASTENER STANDARD

WX 100 2020 05 27

Lubricant: ISO general purpose metric screw threaded steel fasteners whose thread form is in
accordance with ISO 261 and/or whose material and performance requirement
reference ISO 898-1 or 898-2 shall be lubricated with a specified approved lubricant
which meets the requirements of WZ 102.
Friction Coefficient: See specification WSS-M3P39-A1 for details.
Color: Light to dark gray
Cyclic Corrosion: Not applicable
Salt Spray Corrosion: 8 hours for ferrous corrosion
Service Temperature: 80 °C
Tox Number: N/A
Special Requirements: Coated parts offer essentially no corrosion protection and shall only be used
for internal applications where corrosion protection is not a requirement.
Lubricated parts shall meet the requirements for torque/clamping force specified in
WZ 102 or the requirements of the individual product specification, e.g., Thread
Rolling Screws WD 951/952, Prevailing Torque Nuts WE 955. Fasteners that do
not fully conform to the aforementioned requirements shall not use this finish suffix.
Recommended Usage: Externally threaded fasteners for internal engine and transmission applications
for the control of torque/clamping force performance.

S453 HIGH TEMP ZINC-RICH INORGANIC BASECOAT, ALUMINUM-RICH INORGANIC TOPCOAT

This finish is an organic coating over an inorganic zinc rich basecoat.

Specification: WSS-M21P53-A1
Approved Source: Magni Group Inc. – Magni 597 (B68 + B68+ B72)
Coating Process: Dip Spin. Basecoat 2 times + topcoat
Total Thickness: 17.0 micrometers, min.; 18 – 27 micrometers typical
Lubricant: Integral friction modifiers in topcoat.
Friction Coefficient: µ = 0.14 ±0.03 per WZ 102.
Color: Grey
Cyclic Corrosion: Zero weeks for white corrosion, 3 weeks for red corrosion.
Service Temperature: 400 - 645 °C
Tox Number:
Special Requirements: See paragraph 2.3.1 on recess fill.
Recommended Usage: Steel double ended studs for mounting exhaust manifolds. Other high temp
applications where antiseize properties are needed.

S900 SPECIAL: This designation denotes a finish that is defined on the part drawing.

The following conditions govern the issuance of S900 series (S900, S901, S902, etc.) fastener finish requests:

An S900 series finish may be released with a utility (W7) or standard fastener (W5) part number. Releasing an
S900 finish requires a completed, approved FAF03-117-1 (1217) form per FAP03-117.
For standard fasteners, a carrier drawing shall be produced in accordance with Engineering CAD & Drafting
Standards. The title block shall include the 'W5' part number and fastener name. The drawing shall contain
the S900 series finish designation and the material specification number; all other information remains exclusive
to the pre-existing standard part drawing.
The S900 series finish requires toxicological clearance prior to use at Ford.
The finish shall be used to support limited usage only.
S900 shall not be used to specify subsequent treatments such as adhesives, sealers, or patches. Refer to WX
200 and WX 201.
S900 shall not be used to specify changes to the base part, dimensions, materials, mechanical properties, or
quality level.

Copyright © 2020, Ford Global Technologies, LLC Page 17 of 19

 WORLDWIDE FASTENER STANDARD

WX 100 2020 05 27

7. SUMMARY OF REVISIONS

2020 05 27
Added delivery modifier DM for chassis or suspension modules. Added embrittlement exemption for rivet
mandrels already in WG 950. Replaced MATS with iPoint Approval (www.MATS.ford.com to
www.gma.ford.com)

2020 01 19
Added WD 954 to exemptions for hydrogen embrittlement avoidance. Added not recommended for single
shear applications to S439LH

2019 12 16
Added recommendation for auto feed systems
Made XA and XB subsequent treatments Not for New Design
Removed Nylok Nytorq XD due to restricted substance – replaced by Precote Top 300 in 2017.
CETP title replaced with test method (TM) title.
Added AIAG CQI-11/12 audit
Added tapping screw (ISO 2702) exemption for required cleaning-dephos to Embrittlement Avoidance
Added: Thread rolling screws do not need a thread allowance for coating thickness
Added FLTM BI 024-01 to cyclic corrosion testing
Added S439B and S439T (blue) which were frequent S900 finishes
Added S439LH for large bolts needing low friction to avoid larger drive tools.
Added S453 to eventually replace S431
Replaced salt spray requirement with L-467 for S451
Moved special requirement statement for S303, S307, S430, S437, S437M and L, S439, S440, S440M,S442,
S450, S450L, S450B, S451, to paragraph 5.6.6 Torque Tension Performance

2019 03 14
Replaced inactive WE 950 with its replacement WE 955.
Aligned paragraph 3. Designation, with the FAP03-117
Added ND to XA and XC subsequent treatments
Revised S300 for inhibitors and plastic parts
Replaced salt spray requirements with L-467 for recommended finishes. S307,S434,S437M/U/L, S439,
S440, S442. Revised requirement for S450 U/B/L,
Replaced WZ 101 with WZ 102 for finishes S307, S439 and S442
Moved all dip spin and electroplate process statements from requirements section to application section.
Moved S306, S415, S424, S441 to WX 100A obsolete finishes.

2017 09 25
Added OmniTECHNIK to XC and XD subsequent treatments
Added section 5.5.4 for Cyclic Corrosion Testing
Removed reference material spec for S417
Revised as received corrosion rating for S437
Updated approved source and tox numbers for S444H and S445H
Added nut usage to S450
Added Tripass 5100 passivate to S450U
Revised note for S451 regarding hydraulic lockup

2016 04 13
Added CETP 00.00-L-467 to Section 4
Added Cyclic Corrosion requirement to S450, S450L, S450B, S450BL
Updated Coventya tox numbers for S450, S450L, S450B, S450BL
Added new S450U finish

2015 09 30
In Section 3.1 – Added “H” indicator
Corrected S307 Min. thickness
Copyright © 2020, Ford Global Technologies, LLC Page 18 of 19
 WORLDWIDE FASTENER STANDARD

WX 100 2020 05 27

Made S430 “NOT FOR NEW DESIGN”

Added new S444H, S445H, S452 finishes

2013 12 20
Removed Coventya only approved in Europe and South America notation in S450,L,B,BL
Changed A1 to A in the S424 material specification.

2013 02 06
Added Section 2.1 Recommended Usage
Removed various references in Section 4
In Section 3.1 added Table 1
Revised and updated all recommended usages.
Added S451, S437L, and S437U finishes
Made corrections to S417 finish
Changed material specs for each S437 finish from WSS-M21P17-B1/B2/B3/B4 to
WSS-M21P52-A1/A2/A3/A4
Added delivery conditions
Added Table 2 (Delivery Conditions)
Updated coating thicknesses

2011 12 23
In Section 5.4, revised embrittlement avoidance requirement
Added Friction Coefficient, Approved Source and Tox Number information to all finishes
Corrected information for S306, S307 and S424 finishes
Miscellaneous editorial correction

2011 04 29
In 3.1 Added descriptors
OBSOLETED 11 suffixes
In S434, Updated description, updated corrosion requirements, added Special Requirement
Added S450, S450L, S450B, S450BL new suffixes

2010 07 20
Added Section 5.8
In S415, S437M, S440M, S449M Special Requirements – deleted references to ISO 898-2 and WE 950.

2010 03 24
In S307, change WSD-M21P11-B2 to -B3 – editorial correction
In S437 and S437M, revised Friction Coefficient requirement

2009 08 19
In Section 4, revise ISO 6157-1 reference to ISO 6157-3.

Copyright © 2020, Ford Global Technologies, LLC Page 19 of 19