Designation: A325M − 13

Standard Specification for

Structural Bolts, Steel, Heat Treated 830 MPa Minimum
Tensile Strength (Metric)1
This standard is issued under the fixed designation A325M; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.

ε1 NOTE—Section 1.2 was editorially corrected in June 2013.

1. Scope* of this standard to establish appropriate safety and health

2
1.1 This specification covers two types of quenched and practices and determine the applicability of regulatory limita-
tempered, steel, metric heavy hex structural bolts having a tions prior to use.
minimum tensile strength of 830 MPa (Note 1).
2. Referenced Documents
1.2 The bolts are intended for use in structural connections.
These connections are comparable to those covered under the 2.1 ASTM Standards:3
requirements of the Specification for Structural Joints Using A153/A153M Specification for Zinc Coating (Hot-Dip) on
High-Strength Bolts, approved by the Research Council on Iron and Steel Hardware
Structural Connections; endorsed by the American Institute of A490M Specification for High-Strength Steel Bolts, Classes
Steel Construction and by the Industrial Fastener Institute. 10.9 and 10.9.3, for Structural Steel Joints (Metric)
1.3 The bolts are furnished in sizes M12 to M36 inclusive. A563M Specification for Carbon and Alloy Steel Nuts (Met-
They are designated by type denoting chemical composition as ric)
follows: A751 Test Methods, Practices, and Terminology for Chemi-
1.3.1 Type 1—Medium-carbon, carbon boron, medium car- cal Analysis of Steel Products
bon alloy, or alloy boron steel. B695 Specification for Coatings of Zinc Mechanically De-
1.3.2 Type 2—Withdrawn in 2003. posited on Iron and Steel
1.3.3 Type 3—Weathering Steel. D3951 Practice for Commercial Packaging
F436M Specification for Hardened Steel Washers (Metric)
1.4 This specification is applicable to metric heavy hex, F606M Test Methods for Determining the Mechanical Prop-
structural bolts only. erties of Externally and Internally Threaded Fasteners,
1.5 Terms used in this specification are defined in Termi- Washers, and Rivets (Metric)
nology F1789. F788/F788M Specification for Surface Discontinuities of
1.6 The values stated in SI units are to be regarded as Bolts, Screws, and Studs, Inch and Metric Series
standard. No other units of measurement are included in this F959M Specification for Compressible-Washer-Type Direct
standard. Tension Indicators for Use With Structural Fasteners
(Metric)
NOTE 1—This specification is the metric companion to the inch pound F1136M Specification for Zinc/Aluminum Corrosion Pro-
Specification A325.
tective Coatings for Fasteners (Metric) (Withdrawn 2011)4
1.7 The following safety hazard caveat pertains only to the F1470 Practice for Fastener Sampling for Specified Me-
test methods portion, Section 10, of this specification. This chanical Properties and Performance Inspection
standard does not purport to address all of the safety concerns, F1789 Terminology for F16 Mechanical Fasteners
if any, associated with its use. It is the responsibility of the user
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G101 Guide for Estimating the Atmospheric Corrosion Re-

sistance of Low-Alloy Steels
1
This specification is under the jurisdiction of ASTM Committee F16 on
Fasteners and is the direct responsibility of Subcommittee F16.02 on Steel Bolts,
3
Nuts, Rivets and Washers. For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Current edition approved Feb. 15, 2013. Published March 2013. Originally contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
approved in 1979. Last previous edition approved in 2009 as A325M – 09 . DOI: Standards volume information, refer to the standard’s Document Summary page on
10.1520/A0325M-13. the ASTM website.
2 4
For ASME Boiler and Pressure Vessel Code applications, see related Specifi- The last approved version of this historical standard is referenced on
cation SA-325M in Section II of that Code. www.astm.org.

*A Summary of Changes section appears at the end of this standard

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 A325M − 13
2.2 ASME Standards:5 3.3 Recommended Washers:
B 1.13M Metric Screw Threads 3.3.1 Washers conforming to Specification F436M are the
B 18.2.3.7M Metric Heavy Hex Structural Bolts recommended washers for use with Specification A325M
B 18.18.3M Inspection and Quality Assurance for Special Metric heavy hex structural bolts. The washers shall have a
Purpose Fasteners surface finish for each type of bolt as follows:
B 18.24 Part Identifying Number (PIN) Code System Stan- Bolt Type and Finish Washer Finish
dard for B18 Fastener Products 1, plain (uncoated) plain (uncoated)

2.3 RCSC Standard:6 1, zinc-coated zinc-coated

Specification for Structural Joints Using High-Strength
Bolts 1, coated in coated in accordance with
accordance with Specification F1136M
Specification F1136M,
3. Ordering Information Grade 3
3.1 Orders for heavy hex structural bolts under this speci- 3, plain weathering steel, plain
fication shall include the following:
3.4 Other Accessories:
3.1.1 Quantity (number of pieces of bolts and accessories).
3.4.1 When compressible washer type direct tension indica-
3.1.2 Size, including nominal bolt diameter, thread pitch
tors are specified to be used with these bolts, they shall
and bolt length.
conform to the requirements in Specification F959M Type 8.8.
3.1.3 Name of product, heavy hex structural bolts.
3.1.4 When bolts threaded full length are required, Supple-
mentary Requirement S1 shall be specified.
3.1.5 Type of bolt; Type 1 or Type 3. When the type is not TABLE 1 Chemical Requirements for Type 1 Bolts
specified, either Type 1 or Type 3 shall be furnished at the
supplier’s option. Carbon Steel
3.1.6 ASTM designation and year of issue. Element
Heat Product
3.1.7 Other components such as nuts, washers, and com- Analysis Analysis
pressible washer-type direct-tension indicators, if required. Carbon 0.30–0.52 0.28–0.55
3.1.8 Zinc Coating—Specify the zinc-coating process Manganese, min 0.60 0.57
Phosphorus, max 0.040 0.048
required, for example, hot-dip, mechanically deposited, Zinc Sulfur, max 0.050 0.058
Aluminium Corrosion Protective Coating or no preference (see Silicon 0.15–0.30 0.13–0.32
4.3).
Carbon Boron Steel
3.1.9 Other Finishes—Specify other protective finish, if Element
Heat Product
required. Analysis Analysis
3.1.10 Test reports, if required (see Section 13). Carbon 0.30–0.52 0.28–0.55
Manganese, min 0.60 0.57
3.1.11 Supplementary or special requirements, if required. Phosphorus, max 0.040 0.048
3.1.12 For establishment of a part identifying system, see Sulfur, max 0.050 0.058
ASME B18.24. Silicon 0.10–0.30 0.08–0.32
Boron 0.0005–0.003 0.0005–0.003
NOTE 2—A typical ordering description follows: 1000 pieces,
M24×3×100, heavy hex structural bolts, Type 1 ASTM A325M - 03, each Alloy Steel
Element
with one hardened washer and one heavy hex nut, mechanically deposited Heat Product
Analysis Analysis
zinc coating (see 3.1.8 for any special requirements).
Carbon 0.30–0.52 0.28–0.55
3.2 Recommended Nuts: Manganese, min 0.60 0.57
Phosphorus, max 0.035 0.040
3.2.1 Nuts conforming to the requirements of Specification Sulfur, max 0.040 0.045
A563M are the recommended nuts for use with A325M metric Silicon 0.15–0.35 0.13–0.37
A A
heavy hex structural bolts. The nuts shall be of the class and Alloying Elements
Alloy Boron Steel
have a surface finish for each type of bolt as follows: Heat Product
Bolt Type and Finish Nut Class and Finish Specification Analysis Analysis
1, plain (noncoated) A563M—8S or 8S3, plain Carbon 0.30–0.52 0.28–0.55
Manganese, min 0.60 0.57
1, zinc-coated A563M—10S, zinc-coated Phosphorus, max 0.035 0.040
Sulfur, max 0.040 0.045
1, coated in accordance with A563M—10S coated in accordance with Silicon 0.15–0.35 0.13–0.37
Specification F1136M, Grade 3 Specification F1136M, Grade 5 Boron 0.0005–0.003 0.0005–0.003
A A
Alloying Elements
3, plain A563M—8S3, plain A
Steel, as defined by the American Iron and Steel Institute, shall be considered to
be alloy when the maximum of the range given for the content of alloying elements
exceeds one or more of the following limits: Manganese, 1.65 %; silicon, 0.60 %;
copper, 0.60 % or in which a definite range or a definite minimum quantity of any
5
Available from American Society of Mechanical Engineers (ASME), ASME of the following elements is specified or required within the limits of the recognized
International Headquarters, Three Park Ave., New York, NY 10016-5990, http:// field of constructional alloy steels: aluminum, chromium up to 3.99 %, cobalt,
www.asme.org. columbium, molybdenum, nickel, titanium, tungsten, vanadium, zirconium, or any
6
Available from American Institute of Steel Construction (AISC), One E. other alloying elements added to obtain a desired alloying effect.
Wacker Dr., Suite 700, Chicago, IL 60601-2001, http://www.aisc.org.
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 A325M − 13
TABLE 2 Chemical Requirements for Type 3 Heavy Hex Structural BoltsA
Composition, %
Type 3 BoltsA
Element A B C D E F
Carbon:
Heat analysis 0.33–0.40 0.38–0.48 0.15–0.25 0.15–0.25 0.20–0.25 0.20–0.25
Product analysis 0.31–0.42 0.36–0.50 0.14–0.26 0.14–0.26 0.18–0.27 0.19–0.26

Manganese:
Heat analysis 0.90–1.20 0.70–0.90 0.80–1.35 0.40–1.20 0.60–1.00 0.90–1.20
Product analysis 0.86–1.24 0.67–0.93 0.76–1.39 0.36–1.24 0.56–1.04 0.86–1.24

Phosphorus:
Heat analysis 0.035 max 0.06–0.12 0.035 max 0.035 max 0.035 max 0.035 max
Product analysis 0.040 max 0.06–0.125 0.040 max 0.040 max 0.040 max 0.040 max

Sulfur:
Heat analysis 0.040 max 0.040 max 0.040 max 0.040 max 0.040 max 0.040 max
Product analysis 0.045 max 0.045 max 0.045 max 0.045 max 0.045 max 0.045 max

Silicon:
Heat analysis 0.15–0.35 0.30–0.50 0.15–0.35 0.25–0.50 0.15–0.35 0.15–0.35
Product analysis 0.13–0.37 0.25–0.55 0.13–0.37 0.20–0.55 0.13–0.37 0.13–0.37

Copper:
Heat analysis 0.25–0.45 0.20–0.40 0.20–0.50 0.30–0.50 0.30–0.60 0.20–0.40
Product analysis 0.22–0.48 0.17–0.43 0.17–0.53 0.27–0.53 0.27–0.63 0.17–0.43

Nickel:
Heat analysis 0.25–0.45 0.50–0.80 0.25–0.50 0.50–0.80 0.30–0.60 0.20–0.40
Product analysis 0.22–0.48 0.47–0.83 0.22–0.53 0.47–0.83 0.27–0.63 0.17–0.43

Chromium:
Heat analysis 0.45–0.65 0.50–0.75 0.30–0.50 0.50–1.00 0.60–0.90 0.45–0.65
Product analysis 0.42–0.68 0.47–0.83 0.27–0.53 0.45–1.05 0.55–0.95 0.42–0.68

Vanadium:
B B B B B
Heat analysis 0.020 min
B B B B B
Product analysis 0.010 min

Molybdenum:
B B B B
Heat analysis 0.06 max 0.10 max
B B B B
Product analysis 0.07 max 0.11 max

Titanium:
B B B B B
Heat analysis 0.05 max
B B B B B
Product analysis 0.06 max
A
A, B, C, D, E, and F are classes of material used for Type 3 bolts. Selection of a class shall be at the option of the bolt manufacturer.
B
These elements are not specified or required.

4. Materials and Manufacture 4.3.1 When zinc-coated fasteners are required, the pur-
4.1 Heat Treatment: chaser shall specify the zinc coating process, for example, hot
4.1.1 Type 1 bolts produced from medium carbon steel shall dip, mechanically deposited, Zinc/Aluminum Corrosion Pro-
be quenched in a liquid medium from the austenitizing tective Coating, or no preference.
temperature. 4.3.2 When hot-dip is specified, the fasteners shall be
4.1.2 Type 1 bolts produced from carbon steel to which zinc-coated by the hot-dip process and the coating shall
chromium, nickel, molybdenum, or boron were intentionally conform to the coating weight/thickness and performance
added shall be quenched only in oil from the austenitizing requirements of Class C of Specification A153/A153M.
temperature. 4.3.3 When mechanically deposited is specified, the fasten-
4.1.3 Type 3 bolts shall be quenched only in oil from the ers shall be zinc-coated by the mechanical deposition process
austenitizing temperature. and the coating shall conform to the coating weight/thickness
4.1.4 Type 1 bolts, regardless of the steel used, and Type 3 and performance requirements of Class 55 of Specification
bolts, shall be tempered by reheating to not less than 427°C. B695.
4.3.4 When Zinc/Aluminum Corrosion Protective Coating
4.2 Threading—Threads shall be cut or rolled. is specified, the coating shall conform to the coating weight/
4.3 Zinc Coatings, Hot-dip and Mechanically Deposited thickness and performance requirements of Grade 3 of Speci-
and Zinc/Aluminum Corrosion Protective Coating: fication F1136M.
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 A325M − 13
4.3.5 When no preference is specified, the supplier shall TABLE 3 Hardness Requirements for Bolts
furnish either a hot-dip zinc coating in accordance with Bolt Size, Bolt Length, Brinell Rockwell C
Specification A153/A153M, Class C, or a mechanically depos- mm mm Min Max Min Max
ited zinc coating in accordance with Specification B695, Class M12 to M24, Less than 253 319 25 34
55, or a Zinc/Aluminum Corrosion Protective Coating in incl 2D
2D and ... 319 ... 34
accordance with Specification F1136M, Grade 3. Threaded over
components (bolts and nuts) shall be coated by the same M25 to M36, Less than 253 319 25 34
zinc-coating process and the supplier’s option is limited to one incl 3D
3D and ... 319 ... 34
process per item with no mixed processes in a lot. over
D = Nominal diameter or thread size.
4.4 Lubrication—When zinc coated nuts are ordered with
the bolts, the nuts shall be lubricated in accordance with
Specification A563M, Supplementary Requirement S1, to
minimize galling.
length of 2-1⁄4 D and longer; and sizes larger than M24 having
4.5 Secondary Processing: a nominal length of 3D and longer; shall be wedge tested full
4.5.1 If any processing, which can affect the mechanical size and shall conform to the minimum wedge tensile load, and
properties or performance of the bolts is performed after the proof load or alternative proof load specified in Table 4. The
initial testing, the bolts shall be retested for all specified load achieved during proof load testing shall be equal to or
mechanical properties and performance requirements affected greater than the specified proof load.
by the reprocessing. 6.2.1.1 When the length of the bolt makes full size testing
4.5.2 When the secondary process is heat treatment, the

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impractical, machined specimens shall be tested and shall
bolts shall be tested for all specified mechanical properties. Hot conform to the requirements specified in Table 5. When bolts
dip zinc coated bolts shall be tested for all specified mechanical are tested by both full size and machined specimen methods,
properties and rotational capacity. If zinc coated nuts are the full size tent shall take precedence.
relubricated after the initial rotational capacity tests, the 6.2.1.2 Sizes M24 and smaller having a nominal length
assemblies shall be retested for rotational capacity. See 10.2, shorter than 2-1⁄4 D down to 2D inclusive, which cannot be
Note 3. wedge tensile tested shall be axially tension tested full size and
5. Chemical Composition shall conform to the minimum tensile load and proof load, or
alternate proof load specified in Table 4. Sizes M24 and
5.1 Type 1 bolts shall be plain carbon steel, carbon boron smaller having a nominal length shorter than 2D and sizes
steel, alloy steel, or alloy boron steel at the manufacturer’s larger than M24 with nominal lengths shorter than 3D, which
option, conforming to the chemical composition specified in cannot be axially tensile tested, shall be qualified on the basis
Table 1. of hardness.
5.2 Type 3 bolts shall be weathering steel and shall conform 6.2.2 For bolts on which both hardness and tension tests are
to one of the chemical compositions specified in Table 2. The performed, acceptance based on tensile requirements shall take
selection of the chemical composition, A, B, C, D, E, or F, shall precedence in the event of low hardness readings.
be at the option of the bolt manufacturer. See Guide G101 for 6.3 Rotational Capacity Test:
methods of estimating the atmospheric corrosion resistance of
low alloy steels.
5.3 Product analyses made on finished bolts representing TABLE 4 Tensile Load and Proof Load Requirements for Bolts
each lot shall conform to the product analysis requirements Tested Full-Size
specified in Table 1 or Table 2, as applicable. Alternative
Nominal
5.4 Heats of steel to which bismuth, selenium, tellurium, or Proof Load,B Proof Load,B
Diameter Stress Tensile Length Yield
lead has been intentionally added shall not be permitted for and Thread Area,A Load,B Measurement Strength
Pitch mm min, Method Method
bolts.
Column 1 Column 2 Column 3 Column 4 Column 5
5.5 Compliance with 5.4 shall be based on certification that M12 × 1.75 84.3 70 50.6 55.6
heats of steel having any of the listed elements intentionally M16 × 2 157 130 94.2 104
added were not used to produce the bolts. M20 × 2.5 245 203 147 162
M22 × 2.5 303 251 182 200
5.6 Chemical analyses shall be performed in accordance M24 × 3 353 293 212 233
M27 × 3 459 381 275 303
with Test Methods, Practices, and Terminology A751. M30 × 3.5 561 466 337 370
M36 × 4 817 678 490 539
6. Mechanical Properties A
Stress Area, mm2 = 0.7854 (D − 0.9382P) 2
6.1 Hardness—The bolts shall conform to the hardness where:
D = nominal bolt diameter, mm, and
specified in Table 3. P = thread pitch, mm.
B
6.2 Tensile Properties: Loads tabulated are based on the following:
Column 3 Column 4 Column 5
6.2.1 Except as permitted in 6.2.1.1 for long bolts, and 830 MPa 600 MPa 660 MPa
6.2.1.2 for short bolts, sizes M24 and smaller having a nominal

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 A325M − 13
TABLE 5 Tensile Strength Requirements for Specimens coating. After zinc coating, the pitch diameter and major
Machined from Bolts diameter shall not exceed the Class 6g limits by more than the
Nominal Tensile Yield Elongation Reduction following amounts:
Diameter, Strength, Strength, in 4D, of Area,
mm min, MPa min, MPa min, % min, % Nominal Bolt Oversize Limit, mmA
Diameter Hot Dip Zinc Mechanical
M12 to M36 incl 830 660 14 35
Zinc
M12 0.36 0.24
M16 0.42 0.28
M20 0.53 0.35
6.3.1 Definition—The rotational capacity test is intended to M24 0.64 0.43
evaluate the presence of a lubricant, the efficiency of the M27 0.64 0.43
M30 0.75 0.50
lubricant, and the compatibility of assemblies as represented by M36 0.86 0.58
the components selected for testing.
6.3.2 Requirement—Zinc-coated bolts, zinc-coated washers A
Hot-dip zinc nuts are tapped oversize after coating and mechanical zinc-coated
and zinc-coated and lubricated nuts tested full size in an nuts are tapped oversize before coating.
assembled joint or tension measuring device, in accordance 7.2.3 The gaging limit for bolts shall be verified during
with 10.2, shall not show signs of failure when subjected to the manufacture. In case of dispute, a calibrated thread ring gage of
nut rotation in Table 6. The test shall be performed by the the same size as the oversize limit in 7.2.2 (Class X tolerance,
responsible party (see Section 14) prior to shipment after zinc gage tolerance plus) shall be used to verify compliance. The
coating and lubrication of nuts. See 10.2, Note 3. gage shall assemble with hand effort following application of
6.3.3 Acceptance Criterion—The bolt and nut assembly light machine oil to prevent galling and damage to the gage.
shall be considered as non-conforming if the assembly fails to These inspections, when performed to resolve controversy,
pass any one of the following specified requirements: shall be conducted at the frequency specified in the quality
6.3.3.1 Inability to install the assembly to the nut rotation in assurance provisions of ASME B18.2.6.
Table 6.
6.3.3.2 Inability to remove the nut after installing to the 8. Workmanship
rotation specified in Table 6. 8.1 The allowable limits, inspection and evaluation of the
6.3.3.3 Shear failure of the threads as determined by visual surface discontinuities quench cracks, forging cracks, head
examination of bolt and nut threads following removal. bursts, shear bursts, seams, folds, thread laps, voids, tool
6.3.3.4 Torsional or torsional/tension failure of the bolt. marks, nicks and gouges shall be in accordance with Specifi-
Elongation of the bolt, in the threads between the nut and bolt cation F788/F788M.
head, is to be expected at the required rotation and is not to be
classified as a failure. 9. Number of Tests and Retests

7. Dimensions 9.1 Testing Responsibility:

9.1.1 Each lot shall be tested by the manufacturer prior to
7.1 Head and Body: shipment in accordance with the lot identification control
7.1.1 The bolts shall conform to the dimensions for metric quality assurance plan in 9.2 – 9.5.
heavy hex structural bolts specified in ASME B18.2.3.7M. 9.1.2 When bolts are furnished by a source other than the
7.1.2 The thread length shall not be changed except as manufacturer, the Responsible Party as defined in 14.1 shall be
provided in Supplementary Requirement S1. Bolts with thread responsible for assuring all tests have been performed and the
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lengths other than those required by this specification shall be bolts comply with the requirements of this specification (see
ordered under Specification F568M. 4.5).
7.2 Threads: 9.2 Purpose of Lot Inspection—The purpose of a lot inspec-
7.2.1 Uncoated—Threads shall be Metric Coarse Thread tion program is to ensure that each lot conforms to the
Series as specified in ASME B1.13M and shall have Grade 6g requirements of this specification. For such a plan to be fully
tolerances. effective it is essential that secondary processors, distributors,
7.2.2 Coated: and purchasers maintain the identification and integrity of each
7.2.2.1 Unless otherwise specified, zinc-coated bolts, to be lot until the product is installed.
used with zinc-coated nuts or tapped holes, which are tapped
oversize in accordance with Specification A563M, shall have 9.3 Lot Method—All bolts shall be processed in accordance
6g threads before hot-dip or mechanically deposited zinc with a lot identification-control quality assurance plan. The
manufacturer, secondary processors, and distributors shall
identify and maintain the integrity of each production lot of
TABLE 6 Rotational Capacity Test for Zinc-Coated Bolts bolts from raw-material selection through all processing op-
Nominal Bolt Nut Rotation, erations and treatments to final packing and shipment. Each lot
Length, mm degrees (turn), min
shall be assigned its own lot-identification number, each lot
2D and shorter 180 (1⁄2)
Over 2D to 3D incl 240 (2⁄3)
shall be tested, and the inspection test reports for each lot shall
Over 3D to 4D incl 300 (7⁄8) be retained.
Over 4D to 8D incl 360 (1)
Over 8D 420 (1-1⁄8) 9.4 Lot Definition—A lot shall be a quantity of uniquely
identified heavy hex structural bolts of the same nominal size

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 A325M − 13
and length produced consecutively at the initial operation from 11. Inspection
a single mill heat of material and processed at one time, by the 11.1 If the inspection described in 11.2 is required by the
same processor in the same manner so that statistical sampling purchaser, it shall be specified in the inquiry and contract or
is valid. The identity of the lot and lot integrity shall be order.
maintained throughout all subsequent operations and packag-
11.2 The purchaser’s representative shall have free entry to
ing.
all parts of the manufacturer’s works, or supplier’s place of
9.5 Number of Tests—The minimum number of tests from business, that concern the manufacture or supply of the
each lot for the tests specified below shall be as follows: material ordered. The manufacturer or supplier shall afford the
Number of Tests in purchaser’s representative all reasonable facilities to satisfy
Tests
Accordance with him that the material is being furnished in accordance with this
Hardness, Tensile Strength, Guide F1470
Proof Load and Rotational
specification. All tests and inspections required by the specifi-
Capacity cation that are requested by the purchaser’s representative shall
Coating Weight / Thickness The referenced coating be made before shipment, and shall be conducted as not to
specificationA
Surface Discontinuities Specification F788/F788M
interfere unnecessarily with the operation of the manufactur-
Dimensions and Thread Fit ASME B18.2.6 er’s works or supplier’s place of business.
A
Guide F1470 if the coating specification does not specify a testing frequency. 12. Rejection and Rehearing
12.1 Disposition of nonconforming bolts shall be in accor-
10. Test Methods dance with Guide F1470 section titled “Disposition of Non-
conforming Lots.”
10.1 Tensile, Proof Load, and Hardness:
10.1.1 Tensile, proof load and hardness tests shall be con- 13. Certification
ducted in accordance with Test Methods F606M. 13.1 When specified on the purchase order, the manufac-
10.1.2 Tensile strength shall be determined using the Wedge turer or supplier, whichever is the responsible party as defined
or Axial Tension Testing Method of Full Size Product Method in Section 14, shall furnish the purchaser test reports which
or the Machined Test Specimens Method depending on size include the following:
and nominal length as specified in 6.2.1 – 6.2.1.2. Fracture on 13.1.1 Heat analysis, heat number, and a statement certify-
full size tests shall be in the body or threads of the bolt without ing that heats having the elements listed in 5.4 and intention-
a fracture at the junction of the head and body. ally added were not used to produce the bolts,
10.1.3 Proof load shall he determined using Method 1, 13.1.2 Results of hardness, tensile, and proof load tests,
Length measurement; or Method 2, Yield Strength; at the 13.1.3 Results of rotational capacity tests. This shall include
option of the manufacturer. the test method used (solid plate or tension measuring device);
and the statement “Nuts Lubricated” for zinc-coated nuts when
10.2 Rotational Capacity (Note 3)—The zinc-coated bolt
shipped with zinc-coated bolts,
shall be placed in a steel joint or tension measuring device and
13.1.4 Zinc coating measured coating weight/thickness for
assembled with a zinc-coated washer and a zinc-coated and
coated bolts,
lubricated nut with which the bolt is intended to be used. The
13.1.5 Statement of compliance of visual inspection for
nut shall have been provided with the lubricant described in the
surface discontinuities (Section 8),
last paragraph of the Manufacturing Processes section of
13.1.6 Statement of compliance with dimensional and
Specification A563M. The joint shall be one or more flat
thread fit requirements,
structural steel plates or fixture stack up with a total thickness,
13.1.7 Lot number and purchase order number,
including the washer, such that 3 to 5 full threads of the bolt are
13.1.8 Complete mailing address of responsible party, and
located between the bearing surfaces of the bolt head and nut.
13.1.9 Title and signature of the individual assigned certi-
The hole in the joint shall have the same nominal diameter as
fication responsibility by the company officers.
the hole in the washer. The initial tightening of the nut shall
produce a load in the bolt not less than 10 % of the specified 13.2 Failure to include all the required information on the
proof load. After initial tightening, the nut position shall be test report shall be cause for rejection.
marked relative to the bolt, and the rotation shown in Table 6 14. Responsibility
shall be applied. During rotation, the bolt head shall be
restrained from turning. After the tightening rotation has been 14.1 The party responsible for the fastener shall be the
applied, the assembly shall be taken apart and examined for organization that supplies the fastener to the purchaser.
compliance with 6.3.3. 15. Product Marking
NOTE 3—Rotational capacity tests shall apply only to matched assem- 15.1 Manufacturer’s Identification—All Type 1 and 3 bolts
bly lots that contain one A325M bolt, one A563M lubricated nut, and one
F436M washer which have been zinc-coated in accordance with the shall be marked by the manufacturer with a unique identifier to
requirements in 4.3. Both the bolt and nut components of the matched identify the manufacturer or private label distributor, as appro-
assembly shall be zinc-coated using the same process. priate.

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 A325M − 13
15.2 Grade Identification: 16. Packaging and Package Marking
15.2.1 Type 1 bolts shall be marked “A325M” and “8S.” In 16.1 Packaging:
addition, bolts marked “8.8S” shall be an acceptable marking 16.1.1 Unless otherwise specified, packaging shall be in
provided they also meet the requirements of ISO 7412. accordance with Practice D3951.
15.2.2 Type 3 bolts shall be marked “A325M” (with the 16.1.2 When zinc-coated nuts are included on the same
A325M) underlined) and “8S3.” In addition, bolts marked order as zinc-coated bolts, the bolts and nuts shall be shipped
“8.8S3” shall be an acceptable marking provided they also in the same container.
meet requirements of ISO 7412. The use of additional distin- 16.1.3 When special packaging requirements are required,
guishing marks to indicate the bolts are weathering steel shall they shall be defined at the time of the inquiry and order.
be at the manufacturer’s discretion.
16.2 Package Marking:
15.3 Marking Location and Methods—All marking shall be 16.2.1 Each shipping unit shall include or be plainly marked
located on the top of the bolt head and shall be either raised or with the following information:
depressed at the manufacturer’s option. The base of the metric 16.2.1.1 ASTM designation and type,
property class numerals 8S and 8S3 shall be positioned towards 16.2.1.2 Size,
the closest periphery of the head. 16.2.1.3 Name and brand or trademark of the manufacturer,
15.4 Acceptance Criteria—Bolts which are not marked in 16.2.1.4 Number of pieces,
accordance with these provisions shall be considered noncon- 16.2.1.5 Lot number,
forming and subject to rejection. 16.2.1.6 Purchase order number, and
15.5 Type (property class) and manufacturer’s or private 16.2.1.7 Country of origin.
label distributor’s identification shall be separate and distinct.
The two identifications shall preferably be in different locations 17. Keywords
and, when on the same level, shall be separated by at least two 17.1 alloy steel; bolts; carbon steel; metric; steel; structural;
spaces. weathering steel

SUPPLEMENTARY REQUIREMENTS

The following supplementary requirements shall apply only when specified by the purchaser in the
contract or order. Details of these supplementary requirements shall be agreed upon in writing between
the manufacturer and purchaser. Supplementary requirements shall in no way negate any requirement
of the specification itself.

S1. Bolts Threaded Full Length hand as far as the thread will permit, shall not exceed the length
S1.1 Bolts with nominal lengths equal to or shorter than of 21⁄2 threads for bolt sizes M24 and smaller, and 31⁄2 threads
four times the nominal bolt diameter shall be threaded full for bolt sizes larger than M24.
length. Bolts need not have a shoulder, and the distance from S1.2 Bolts shall be marked in accordance with Section 15
the underhead bearing surface to the first complete (full form) except that the symbol shall be “A 325MT” instead of
thread, as measured with a GO thread ring gage, assembled by “A325M”.

SUMMARY OF CHANGES

Committee F16 has identified the location of selected changes to this standard since the last issue (A325–09)
that may impact the use of this standard. (Approved Feb. 15, 2013.)

(1) Revised Sections 6 and 10.1.2 to clarify “nominal” length.

(2) Revised 6.2, Table 3, and Table 4 to clarify testing
requirements for large diameter bolts with short lengths.

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 A325M − 13
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