ASTM F837 - 20

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Designation: F837 −20
Standard Speciﬁcation for
Stainless Steel Socket Head Cap Screws
1
This standard is issued under the ﬁxed designation F837; 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.
This standard has been approved for use by agencies of the U.S. Department of Defense.
1. Scope*
1.1 This speciﬁcation covers the chemical and mechanical
requirements for stainless steel inch socket head cap screw
(SHCS) with nominal thread 0.060 through 1.500 in. and
intended for use in applications requiring general corrosion
resistance.
1.2 Three groups of stainless steel alloys are covered,
austenitic Group 1 and 2 and martensitic Group 5.
1.3 Four property conditions are covered: austenitic Alloy
Groups 1 and 2 in an annealed condition (AF) at 85 ksi
maximum, in two cold worked conditions (CW) at 80 ksi
minimum, (CW1) at 102 ksi minimum, and martensitic Alloy
Group 5 in a heat treated condition (HT) at 160 ksi minimum.
1.4 The values stated in inch-pound units are to be regarded
as standard. No other units of measurement are included in this
standard.
1.5 The following precautionary caveat pertains only to the
test method portion, Section 13, of this speciﬁcation: This
standard does not purport to address all of the safety concerns,
if any, associated with its use. It is the responsibility of the user
of this standard to establish appropriate safety, health, and
environmental practices and determine the applicability of
regulatory limitations prior to use.
1.6 This international standard was developed in accor-
dance with internationally recognized principles on standard-
ization established in the Decision on Principles for the
Development of International Standards, Guides and Recom-
mendations issued by the World Trade Organization Technical
Barriers to Trade (TBT) Committee.
2. Referenced Documents
2.1 ASTM Standards:
2
A262 Practices for Detecting Susceptibility to Intergranular
Attack in Austenitic Stainless Steels
A342/A342M Test Methods for Permeability of Weakly
Magnetic Materials
A380 Practice for Cleaning, Descaling, and Passivation of
Stainless Steel Parts, Equipment, and Systems
A555/A555M Speciﬁcation for General Requirements for
Stainless Steel Wire and Wire Rods
A751 Test Methods, Practices, and Terminology for Chemi-
cal Analysis of Steel Products
A967 Speciﬁcation for Chemical Passivation Treatments for
Stainless Steel Parts
D3951 Practice for Commercial Packaging
E18 Test Methods for Rockwell Hardness of Metallic Ma-
terials
E92 Test Methods for Vickers Hardness and Knoop Hard-
ness of Metallic Materials
E384 Test Method for Microindentation Hardness of Mate-
rials
F606 Test Methods for Determining the Mechanical Proper-
ties of Externally and Internally Threaded Fasteners,
Washers, and Rivets (Metric) F0606_F0606M
F788/F788M Speciﬁcation for Surface Discontinuities of
Bolts, Screws, and Studs, Inch and Metric Series
F1470 Practice for Fastener Sampling for Speciﬁed Me-
chanical Properties and Performance Inspection
2.2 ASME Standard:
ASME B18.3 Socket Cap, Shoulder, and Set Screws—Inch
Series
3
2.3 JIS Standard:
4
JIS G 4311 Heat Resisting Steel Bar and Wire Rods
3
1
This speciﬁcation is under the jurisdiction of ASTM Committee F16 on
Fasteners and is the direct responsibility of Subcommittee F16.04 on Nonferrous
Fasteners.
Current edition approved May 1, 2020. Published May 2020. Originally
approved in 1988. Last previous edition approved in 2018 as F837 – 13(2018). DOI:
10.1520/F0837-20.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website.
3
Available from American Society of Mechanical Engineers (ASME), ASME
International Headquarters, Two Park Ave., New York, NY 10016-5990, http://
www.asme.org.
4
Available from Japanese Standards Association (JSA), Mita MT Bldg., 3-13-12
Mita, Minato-ku, Tokyo 108-0073, Japan, http://www.jsa.or.jp.
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

3. Classiﬁcation
3.1 The austenitic stainless steel socket head cap screw shall
be designated F837 Group 1 or 2 Condition AF, F837 Group 1
or 2 Condition CW, or F837 Group 1 or 2 Condition CW1.
3.2 The martensitic stainless steel socket head cap screw
shall be designated F837 Group 5 Condition HT.
4. Ordering Information
4.1 Orders for socket head cap screws under this speciﬁca-
tion shall include:
4.1.1 Quantity (number of pieces of each item).
4.1.2 Name of the item (socket head cap screws, SHCS).
4.1.3 Size (nominal diameter, thread pitch, thread class,
screw length) or part number.
4.1.4 Alloy Group (see 7.1) and Condition (Group 1 or 2
AF, Group 1 or 2 CW, Group 1 or 2 CW1, or Group 5 HT).
4.1.5 ASTM speciﬁcation and year of issue. When year of
issue is not speciﬁed, fasteners shall be furnished to the latest
issue.
4.1.6 Supplementary requirements, if any, (see S1 through
S7).
4.1.7 Additional special requirements, if any, to be speciﬁed
on the purchase order:
4.1.7.1 Forming (see 5.1).
4.1.7.2 Threading (see 5.2).
4.1.7.3 Surface ﬁnish (see 11.1).
4.1.7.4 Alloy selection (see 7.2).
4.1.7.5 Test report (see 12.2).
4.1.7.6 Additional testing (see 12.3).
4.1.7.7 Inspection (see 14.1).
4.1.7.8 Rejection (see 15.1).
4.1.7.9 Certiﬁcation (see 16.1).
4.1.7.10 Special packaging requirements (see 18.3).
4.1.7.11 Supplementary requirements as needed.
5. Materials and Manufacture
5.1 Heads—Unless otherwise speciﬁed the head and socket
recess of the screw may be hot forged, cold forged, or
machined at the option of the manufacturer. Users requiring
cold forged heads should specify Supplementary Requirements
S6.
5.2 Threads—Unless otherwise speciﬁed, screws in sizes up
to 1.00 in. inclusive and product lengths up to 6 in. inclusive,
shall have threads formed by rolling, except by special agree-
ment with the purchaser. Larger products may be rolled, cut, or
ground at the option of the manufacturer.
6. Heat Treatment
6.1 Austenitic alloys Group 1 or 2 Condition AF screws,
following manufacture, shall be annealed by heating to 1900 6
50 °F to obtain maximum corrosion resistance and minimum
permeability. The screws shall be held for a sufficient time at
temperature and then cooled at a rate sufficient to prevent
precipitation of the carbide and to provide the properties
speciﬁed in Table 1.
6.2 When Condition CW or CW1 is speciﬁed, the austenitic
alloys shall be annealed as speciﬁed in 6.1 generally by the raw
material manufacturer, then cold worked to develop speciﬁc
properties.
6.3 Martensitic alloy Group 5 Condition HT screws shall be
hardened and tempered by heating to 1800 650 °F sufficient
for austenitization, holding for at least
1
⁄
2
h, rapid air or oil
quenching, reheating to 525 °F minimum and holding for at
least 1 h and then air cooling to provide the properties speciﬁed
in Table 1.
7. Chemical Properties
7.1 It is the intent of this speciﬁcation that screws shall be
ordered by alloy group and condition. The chemical composi-
tion of the screw material shall conform to the requirements of
Table 2.
7.2 Unless otherwise speciﬁed in the inquiry and purchase
order (see Supplementary Requirements S2) the choice of an
alloy from within a group shall be at the discretion of the
fastener manufacturer as required by their method of fastener
fabrication and material availability. The speciﬁc alloy used by
the manufacturer shall be clearly identiﬁed on all certiﬁcation
required in the purchase order and shall have chemical com-
position conforming to the limits speciﬁed in Table 2.
7.3 When chemical analysis is performed by the purchaser
using ﬁnished fasteners representing each lot, the chemical
TABLE 1 Mechanical Property Requirements
Alloy
Group Condition
Alloy
Mechanical
Property
Marking
Nominal
Thread
Diameter
A
Full-Size Product Machine Specimen Core Hardness
B
Tensile
Strength, ksi
Minimum
Extension
C
Tensile
Strength, ksi
Yield Strength,
ksi
Minimum
Elongation,
%
Vickers Rockwell
1 AF F837A 0.060–1.500 85 max 0.6D85 max 55 max 40 210 max 95 HRB max
1 CW F837B 0.060–0.750 80 min 0.4D80 min 40 min 25 150 min 50 HRA min
1 CW1 F837C 0.060–0.750 102 min 0.4D87 min 65 min 20 220 min 59 HRA min
2 AF F837D 0.060–1.500 85 max 0.6D85 max 55 max 40 210 max 95 HRB max
2 CW F837E 0.060–0.750 80 min 0.4D80 min 40 min 25 150 min 50 HRA min
2 CW1 F837F 0.060–0.750 102 min 0.4D87 min 65 min 20 220 min 59 HRA min
5 HT F837G 0.060–0.190 180 min . . . . . . . . . . . . 350–423 36–43 HRC
5 HT F837H 0.250–1.500 180 min 0.2D160 min 120 min 12 350–423 36–43 HRC
A
For CW and CW1 condition fasteners with nominal thread diameter larger than 0.750 in., the mechanical properties and marking shall be agreed upon between the user
and manufacturer.
B
Core hardness is only required when full-size product tensile testing cannot be accomplished.
C
Ddenotes nominal thread size.
F837 − 20
2

contents obtained shall conform to the limits speciﬁed in Table
2for the speciﬁc alloy. Chemical contents shall conform to the
tolerances speciﬁed in Speciﬁcation A555/A555M.
7.3.1 In the event of discrepancy, a referee analysis as
speciﬁed in 13.1 of samples for each lot shall be made in
accordance with 12.3.1.
8. Mechanical Properties
8.1 Screws shall be tested in accordance with the mechani-
cal testing requirements for the alloy group and condition
nominal thread diameter, length, and speciﬁed minimum ten-
sile strength as speciﬁed in Table 3 and shall meet the
mechanical requirements speciﬁed for that product in Table 1.
8.2 For products on which both hardness and tension tests
are performed, acceptance based on tensile requirements shall
take precedence over low hardness readings (see Table 4).
9. Corrosion Resistance
9.1 Carbide Precipitation:
9.1.1 Rod, bar, and wire in the austenitic alloy groups 1 and
2 (not including the free-machining grade 303) used to make
fasteners in accordance with this speciﬁcation shall be capable
of passing the test for susceptibility to intergranular corrosion
as speciﬁed in Practice E of Practice A262.
9.1.2 As stated in Practices A262, samples may be subjected
to the faster and more severe screening test in accordance with
Practice A. Failing Practice A, specimens shall be tested to
Practice E and be considered satisfactory if passing Practice E.
10. Dimensions
10.1 Unless otherwise speciﬁed, the products shall conform
to the requirements of ASME B18.3.
11. Workmanship, Finish, and Appearance
11.1 Surface Treatment—Unless otherwise speciﬁed, screws
shall be cleaned, descaled and passivated in accordance with
Practice A380 or Speciﬁcation A967 at the option of the
manufacturer.
11.2 The surface discontinuities for these products shall
conform to Speciﬁcation F788/F788M and the additional
limitations speciﬁed herein.
11.2.1 Forging defects that connect the socket to the periph-
ery of the head are not permissible. Defects originating on the
periphery and with a traverse indicating a potential to intersect
are not permissible. Other forging defects are permissible
provided those located in the bearing area, ﬁllet, and top
surfaces shall not have a depth exceeding 0.03 Dor 0.005 in,
whichever is greater. For peripheral discontinuities, the maxi-
mum depth may be 0.06 D(see Fig. 1).
TABLE 2 Chemical Requirements
Alloy
Group
UNS
Designation Alloy
Composition, % maximum except as shown, ellipses indicate no requirement for listed element
Carbon Manganese Phosphorus Sulfur Silicon Chromium Nickel Copper Molybdenum
Austenitic Alloys
1 S30300 303
A
0.15 2.00 0.20 0.15 min 1.00 17.0 to 19.0 8.0 to 10.0 . . . 0.60
B
1 S30400 304 0.08 2.00 0.045 0.030 1.00 18.0 to 20.0 8.0 to 10.5
C
...
1 S30403 304L 0.030 2.00 0.045 0.030 1.00 18.0 to 20.0 8.0 to 12.0
C
...
1 S30500 305 0.12 2.00 0.045 0.030 1.00 17.0 to 19.0 10.0 to 13.0
C
...
1 S38400 384 0.08 2.00 0.045 0.030 1.00 15.0 to 17.0 17.0 to 19.0 . . . . . .
1 S20300 XM1
A
0.08 5.0 to 6.5 0.040 0.18 to 0.35 1.00 16.0 to 18.0 5.0 to 6.5 1.75 to 2.25 0.50
B
1 S30430 18-9LW 0.10 2.00 0.045 0.030 1.00 17.0 to 19.0 8.0 to 10.0 3.00 to 4.00 . . .
1 S30433 302HQ 0.03 2.00 0.045 0.030 4.00 17.0 to 19.0 8.0 to 10.0 3.0 to 4.0 . . .
1 ... 304J3
D
0.08 2.00 0.045 0.030 1.00 17.0 to 19.0 8.0 to 10.5 1.00 to 3.00 ...
2 S31600 316 0.08 2.00 0.045 0.030 1.00 16.0 to 18.0 10.0 to 14.0 . . . 2.0 to 3.0
2 S31603 316L 0.03 2.00 0.045 0.030 1.00 16.0 to 18.0 10.0 to 14.0 . . . 2.0 to 3.0
Martensitic Alloys
5 S41000 410 0.15 1.00 0.040 0.030 1.00 11.5 to 13.5 . . . . . . . . .
A
Free machining grades are not recommended for forged product. These grades may be furnished only when approved by the purchaser.
B
At manufacturer’s option, determined only when intentionally added.
C
1.00 % Cu max allowed by this standard for formability at manufacturer’s option.
D
304J3 from JIS standard G 4311.
TABLE 3 Mechanical Testing Requirements
Item Product Length
Hardness Test Conducted Using Full Size
Product Test Conducted Using Machined Test Speciﬁcation
max min Extension Axial Tensile
Strength
Yield Strength
0.2 % offset
Tensile
Strength
Elongation
1#3D
AB B
... ... ... ... ...
2>3D-12 in.
B
...
BB
... ... ...
3 Over 12 in.
B
...AABBB
A
Ddenotes nominal diameter of product.
B
Denotes mandatory test. In addition, either all tests denoted by A or all tests denoted by B shall be performed. In case of arbitration full size tests, denoted A, shall be
decisive.
F837 − 20
3

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摘要：

ASTM F837 - 20 是美国材料与试验协会发布的最新标准规范，专门针对不锈钢制无头内六角紧定螺钉（也称内六角平端紧定螺钉或顶丝）的材料、机械性能、尺寸公差及表面处理要求进行了详细规定。该标准取代了旧版 F837-13，适用于多种不锈钢牌号（包括奥氏体、马氏体和沉淀硬化型），并覆盖了公制与英制尺寸系列。通过严格定义抗拉强度、硬度、螺纹精度及测试方法，ASTM F837 - 20 确保了螺钉在紧固应用中的可靠性、耐腐蚀性和一致性。对于工程师、采购人员及质量检测部门而言，遵循此项标准有助于降低

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