UNCONTROLLED COPY - This Engineering Standard is the confidential property of Nissan Motor Co.
, Ltd, and is made available
for retrieving / reading when required for an NTCE development entrusted task. The Supplier will observe the storage,
administration and utilisation rules - see covering letter for details.
Nissan Engineering Standard
Automotive Standard Parts
NES Specifications for Weld Bolts
1. SCOPE This Standard describes specifications of steel weld bolts (hereinafter referred to as bolt).
Specifications for weld bolts with 4T property class conform to the APPENDIX.
Remark: Materials and surface treatment of the parts specified in this Standard must conform to NES M 0301
(Substance Use Restrictions).
2. PROPERTY CLASS, MATERIAL AND HEAT TREATMENT Bolt propety class and material and heat treatment
shall be in accordance with Table 1.
Table 1 Bolt propety class and material and heat treatment
Property Tensile strength Tempering temperature
2 Material Heat treatment
°C (Min.)( )
1
class N/mm
4.8 420 NES M 1019:
WRCH4R or
WRCH4K
8.8 800 NES M 1019: Quenching and tempering 425
2
MnB123H( ) or
MnB320H
1
Note ( ): When testing is carried out in accordance with item 3.1.8 (Repetitive temper testing) of NES D 1012
(Inspection of Hexagon Head Bolts and Hexagon Nuts), the average hardness value must not
2
have a difference which exceeds 20 in Vickers hardness units.
( ): Nominal size M16 and larger shall not be applied.
3. QUALITY
3.1 Surface condition
(1) Bolt surface shall be smooth, and there shall be no flaw such as burrs, residual bend or rust which can be
detrimental for use.
(2) Allowable limits for surface discontinuities shall be in accordance with NES D 2108 (Surface Discontinuities -
Bolts, Screws and Studs).
3.2 Mechanical properties The mechanical properties of the bolts shall be in accordance with item 5.3.1 of NES D
2110 (Specifications for Bolt).
3.3 Thread Threads shall be in accordance with NES D 1402 (Metric Screw Threads) and the grade shall be 6 g.
The maximum allowable size of thread with surface treatment, however, shall be the maximum allowable size of 4 h
external thread.
Note that the thread root roundness for property class of 8.8 or more shall be 0.1 P minimum.
4. SURFACE TREATMENT Following surface treatment for bolts shall be conducted as assigned.
O Zinc plating: MFZn5TC or MFZn8TC in NES M 4040 (Specifications - Zinc Plating and Chromate Films on Iron
and Steel).
O High corrosion resistant electroplating: Shall be high corrosion resistant hexavalent chromium free black
electroplating in NES D 2110 (Specifications for Bolt).
O Anti Corrosive Zinc Aluminum Compound Coating: Shall be ZAC-2 in NES M 4601 (Anti Corrosive Zinc
Aluminum Compound Coating).
5. INSPECTION Bolts shall be inspected in accordance with NES D 1012 (Inspection of Hexagon Head Bolts and
Hexagon Nuts).
Conformance is required for items 2. to 4., and also with the corresponding component standards.
6. DESIGNATION Bolts shall be designated by part number.
Part name (abbreviated), nominal size, material and surface treatment may be added to the part number in the order
as shown.
Example: 82-70516 BOLT-WELD M5 × 16
82-70840-1A BOLT-WELD M8 × 40 MFZn8TC
Normative References and References: See page 3.
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UNCONTROLLED COPY - This Engineering Standard is the confidential property of Nissan Motor Co., Ltd, and is made available
for retrieving / reading when required for an NTCE development entrusted task. The Supplier will observe the storage,
administration and utilisation rules - see covering letter for details.
APPENDIX Specifications for weld bolts with 4T property class
1. SCOPE This APPENDIX is to be abolished in the future. Accordingly, it shall not be applied to new designs. It only
applies to the parts manufactured by the previous standard.
2. MATERIAL The standard bolt material shall be WRCH4R or WRCH4K specified in NES M 1019 (Wire Rod for Cold
Headed Bolts).
3. QUALITY
3.1 Appearance Bolt surface shall be smooth, and there shall be no flaw such as burrs, residual bend or rust which
can be detrimental to performance. Standard of the allowance of surface defects shall conform to the following.
Surface Allowance
discontinuities
It is allowed when it is present at the top face and its length is 1d max. and the width and the
Forging crack
depth are 0.2 mm + 0.01d max.
Transverse Flaw on the threaded part or the underhead fillet.
discontinuity
It is allowed when it is present at the thread and underhead and the depth is 0.08 mm max. for
Seam
the nominal size of 8 mm and smaller and 0.01d max. for the nominal size of 10 mm and larger.
It is allowed when it is present at the side of the bolt head and both the width and the depth are
Burst
0.3 mm + 0.25d max. without reaching the bearing surface.
(a) It is allowed for areas except the thread.
(b) Impact mark is present at the thread is allowed when the bolt is acceptable for the through-
Impact mark
thread ring gauge at the torque of 58.8 mN·m {0.6 kgf·cm} max. per nominal size of 1 mm.
(Example) For M10, 58.8 × 10 = 588 mN·m {6 kgf·cm}.
Remarks: 1. The meaning of surface discontinuities shall be in accordance with NES D 2108 (Surface Discontinuities - Bolts,
Screws and Studs).
2. d in the Table shows the nominal diameter of screw in mm.
3.2 Mechanical properties Mechanical properties and materials of bolt shall conform to the following.
2 2
Part Tensile strength N/mm Hardness Yield point N/mm
4T ≥ 392 70 to 98 HRB ≥ 294
3.3 Thread Screw threads shall conform to Grade 2 as defined in NES D 1402 (Metric Screw Threads).
In addition, the upper limit of threads after plating shall be the maximum value of Grade 1 external threads.
4. SURFACE TREATMENT Bolt shall be given the following surface treatment when specified.
O Zinc plating: MFZn5TC or MFZn8TC in NES M 4040 (Specifications - Zinc Plating and Chromate Films on Iron
and Steel).
O High corrosion resistant electroplating: Shall be high corrosion resistant hexavalent chromium free black
electroplating in NES D 2110 (Specifications for Bolt).
O Anti Corrosive Zinc Aluminum Compound Coating: Shall be ZAC-2 in NES M 4601 (Anti Corrosive Zinc
Aluminum Compound Coating).
5. INSPECTION Bolts shall be inspected in accordance with NES D 1012 (Inspection of Hexagon Head Bolts and
Hexagon Nuts), and conform to items 3 and 4 and also the requirements of NES D2126.
6. DESIGNATION Bolts shall be designated by part number.
Part name (abbreviated), nominal size, material and surface treatment may be added to the part number in the order
as shown.
Example: 82-70516 BOLT-WELD M5 × 16
82-70840-1A BOLT-WELD M8 × 40 MFZn8TC
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UNCONTROLLED COPY - This Engineering Standard is the confidential property of Nissan Motor Co., Ltd, and is made available
for retrieving / reading when required for an NTCE development entrusted task. The Supplier will observe the storage,
administration and utilisation rules - see covering letter for details.
Normative References and References: NES D 1012-2004 Inspection of Hexagon Head Bolts and
Hexagon Nuts
NES D 1402-2001 Metric Screw Threads
NES D 2108-2000 Surface Discontinuities - Bolts, Screws and
Studs
NES D 2110-2008 Specifications for Bolt
NES M 0301-2008-N Substance Use Restrictions
NES M 1019-2008 Wire Rod for Cold Heated Bolts
NES M 1073-2008 Common Quality of Wire Rod for Cold Headed
Bolts
NES M 4040-2006 Specifications - Zinc Plating and Chromate
Films on Iron and Steel
NES M 4601-2006 Anti Corrosive Zinc Aluminum Compound
Coating
JIS B 1195 Weld bolts
Renault Standard 39-02-206 WELD SCREWS · WELD NUTS
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UNCONTROLLED COPY - This Engineering Standard is the confidential property of Nissan Motor Co., Ltd, and is made available
for retrieving / reading when required for an NTCE development entrusted task. The Supplier will observe the storage,
administration and utilisation rules - see covering letter for details.
ANNEX
1. Revision points at this time
(1) Because the wire rod for boron steel MnB320H was standardized in NES M 1019 (Wire Rod for Cold Headed
Bolts), it has been added as a standard material for property class 8.8.
(2) Until recently, WRCH4R (rimmed steel) has been used as standard material for property classes 4.8 and 4T.
However, because unification with WRCH4K (killed steel) is being advanced with the popularization of
continuous casting method, WRCH4K has been added to the standard material.
(3) Year of revision of normative references has been updated and NES M 1073 (Common Quality of Wire Rod
for Cold Headed Bolts) has been added.
2. Revision history
O Revision in 2006
Olive chromate which had not been previously revised was changed to hexavalent chromium free specification that
satisfies the ELV regulation in Europe.
However, since one standardized substitute material could not be developed, it was decided that a supplier shall
select a substitute material that conforms to the surface treatment specifications prescribed in NES D2110
(Specifications for Bolt).
[Comparison table of old and new surface treatments]
New specification High corrosion resistant hexavalent
(Free from hexavalent chromium) chromium free black electroplating
Conventional specification Olive chromate (Electro-zinc plating)
(Containing hexavalent chromium)
MFZn8G
O Revision in 2005
(1) Since the use of hexavalent chromium will be prohibited by ELV regulations from July 2007 for all vehicles in
Europe, and by the voluntary agreement of the Japan Automobile Manufacturers Association from January
2008 for new vehicle models in Japan, Nissan decided to prohibit the use of it from January 2007 for all
European models and from July 2007 for new models for all other destinations outside Europe. Therefore, the
surface treatment was changed as follows. For olive chromate treatment, however, no changes have been
made this time because the development of substitute materials has not yet been completed.
[Comparison table of old and new surface treatments]
Trivalent clear chromate Anti Corrosive Zinc Aluminum
New specification Compound Coating
(Free from hexavalent chromium) M6 max. M8
MFZn5TC MFZn8TC ZAC-2
Yellow chromate
Conventional specification Zinc Chromate Organic Coating
(Containing hexavalent chromium) M6 max. M8
MFZn5C MFZn8C ZnCr-2
O Revision in 2001
(1) Based on Renault standards and results of Nissan, two property classes of 4.8 and 8.8 were set.
(2) Allowable limits for surface discontinuities were changed to match NES D2108.
O Revision in 2000
(1) The requirements of NES M 0301 (Substance Use Restrictions) were added.
(2) The bolt standard material was changed from SS41 → WRCH4R to match the actual conditions.
(3) Surface discontinuity provisions were changed from JIS B 0101 → NES D 2108.
(4) The maximum value for the hardness of the mechanical property was changed from 97 → 98. (Unified to the
standard of D2126.)
O Revision in 1991
This revision is for the introduction of the phase two for SI units, and the values of standard are not revised
substantially.
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