ASTM F879-15
(Specification)Standard Specification for Stainless Steel Socket Button and Flat Countersunk Head Cap Screws
Standard Specification for Stainless Steel Socket Button and Flat Countersunk Head Cap Screws
ABSTRACT
This specification covers the chemical and mechanical requirements for stainless steel metric hexagon socket button (SBHCS) and flat countersunk (SFHCS) head cap screws with nominal thread M 3 through M 20 intended for use in applications requiring general corrosion resistance. These steels are designated into three classes: Austenitic Class A 1-50 in an annealed condition, Austenitic Class A1-55 in a cold worked condition, and Austenitic Class A 1-70 in a cold worked condition. The austenitic stainless steel socket screw shall be designated F879M A1-50, F879M A1–55, or F 879M A1-70. Screws shall be formed by upsetting or extruding, or both. Also, these screws shall be roll threaded. Austenitic alloys ClassA 1-50 screws, following manufacture, shall be annealed by heating to a certain temperature to obtain maximum corrosion resistance and minimum permeability. The screws shall be held for a sufficient time at temperature, then cooled at a rate sufficient to prevent precipitation of the carbide and provide the properties specified. Different tests shall be conducted in order to determine the following mechanical properties of screws: tensile strength, minimum extension, yield strength, elongation, Vickers hardness, and Rockwell hardness.
SCOPE
1.1 This specification covers the chemical and mechanical requirements for stainless steel inch hexagon socket button (SBHCS) and flat countersunk (SFHCS) head cap screws with nominal thread 0.060 through 0.625 in. intended for use in applications requiring general corrosion resistance.
1.2 Two groups of austenitic stainless steel alloys and three conditions are covered. See Table 1 and Table 2. (A) Actual full-size testing of condition CW and CW1 may result in decreased tensile strength because of the head configuration (see Table 3). For fasteners with nominal thread diameters larger than 0.625 in., the mechanical properties shall be agreed upon between the user and manufacturer.(B) Core hardness is only required when full-size product testing cannot be accomplished.(C) D denotes nominal thread size. (A) 304J3 from JIS G 4309.
1.3 Units—The values stated in inch-pound units are to be regarded as standard. No other units of measurement are included in this standard.
1.4 The following precautionary caveat pertains only to the test method portion, Section 12, 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 and health practices and determine the applicability of regulatory limitations prior to use.
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Designation:F879 −15
Standard Specification for
Stainless Steel Socket Button and Flat Countersunk Head
1
Cap Screws
ThisstandardisissuedunderthefixeddesignationF879;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginal
adoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscript
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* cal Analysis of Steel Products
A967/A967MSpecification for Chemical Passivation Treat-
1.1 This specification covers the chemical and mechanical
ments for Stainless Steel Parts
requirements for stainless steel inch hexagon socket button
D3951Practice for Commercial Packaging
(SBHCS) and flat countersunk (SFHCS) head cap screws with
E18Test Methods for Rockwell Hardness of Metallic Ma-
nominal thread 0.060 through 0.625 in. intended for use in
terials
applications requiring general corrosion resistance.
E92Test Methods for Vickers Hardness and Knoop Hard-
1.2 Two groups of austenitic stainless steel alloys and three
ness of Metallic Materials
conditions are covered. See Table 1 and Table 2.
E384Test Method for Microindentation Hardness of Mate-
rials
1.3 Units—The values stated in inch-pound units are to be
regarded as standard. No other units of measurement are F593Specification for Stainless Steel Bolts, Hex Cap
Screws, and Studs
included in this standard.
F606/F606MTest Methods for Determining the Mechanical
1.4 The following precautionary caveat pertains only to the
Properties of Externally and Internally Threaded
test method portion, Section 12, of this specification: This
Fasteners, Washers, Direct Tension Indicators, and Rivets
standard does not purport to address all of the safety concerns,
F788Specification for Surface Discontinuities of Bolts,
if any, associated with its use. It is the responsibility of the user
Screws, and Studs, Inch and Metric Series
of this standard to establish appropriate safety and health
F1470Practice for Fastener Sampling for Specified Me-
practices and determine the applicability of regulatory limita-
chanical Properties and Performance Inspection
tions prior to use.
2.2 ASME Standard:
3
B18.3Socket Cap, Shoulder and Set Screws (Inch Series)
2. Referenced Documents
4
2 2.3 JIS Standard:
2.1 ASTM Standards:
JIS G 4309Stainless Steel Wires
A262Practices for Detecting Susceptibility to Intergranular
Attack in Austenitic Stainless Steels
3. Classification
A342/A342MTest Methods for Permeability of Weakly
3.1 The designation of the alloy group and condition of this
Magnetic Materials
specification shall be consistent with the stainless steel desig-
A380/A380MPractice for Cleaning, Descaling, and Passi-
nations in Specification F593.
vation of Stainless Steel Parts, Equipment, and Systems
A555/A555MSpecification for General Requirements for
3.2 Screws shall be designated by group and condition (for
Stainless Steel Wire and Wire Rods
example, F879 Group 1 Condition AF).
A751Test Methods, Practices, and Terminology for Chemi-
4. Ordering Information
4.1 Ordersformaterialunderthisspecificationshallinclude
1
This specification is under the jurisdiction of ASTM Committee F16 on
the following information:
Fasteners and is the direct responsibility of Subcommittee F16.04 on Nonferrous
4.1.1 Quantity (number of pieces of each item).
Fasteners.
CurrenteditionapprovedMay1,2015.PublishedJuly2015.Originallyapproved
in 1986. Last previous edition approved in 2012 as F879-12. DOI: 10.1520/F0879-
3
15. Available from American Society of Mechanical Engineers (ASME), ASME
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or International Headquarters, Two Park Ave., New York, NY 10016-5990, http://
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM www.asme.org.
4
Standards volume information, refer to the standard’s Document Summary page on Available from Japanese Industrial Standards Committee (JIS) 1-3-1
the ASTM website. Kasumigaseki, Chiyoda-ku, Tokyo 100-8901, JAPAN. http://www.jisc.go.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
1
---------------------- Page: 1 ----------------------
F879−15
TABLE 1 Mechanical Property Requirements
A B
Full Size Product Tests Machined Specimen Tests Core Hardness
Alloy
C
Alloy Group Tensile Tensile Yield Elongation
Extension
Condition Vickers Rockwell
min
Strength ksi Strength ksi Strength ksi %min
All AF 85 max 0.6D 85 max 55 max 40 210 max 95 HRB max
All CW 80 min 0.4D 80 min 40 min 25 150 min 50 HRA min
All CW1 102 min 0.4D 87 min 65 min 20 220 min 59 HRA min
A
Actual full-size testing of condition
...
This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation: F879 − 12 F879 − 15
Standard Specification for
Stainless Steel Socket Button and Flat Countersunk Head
1
Cap Screws
This standard is issued under the fixed designation F879; 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 hexagon socket button (SBHCS)
and flat countersunk (SFHCS) head cap screws with nominal thread 0.060 through 0.625 in. intended for use in applications
requiring general corrosion resistance.
1.2 Two groups of austenitic stainless steel alloys and three conditions are covered. See Table 1 and Table 2.
1.3 Units—The values stated in inch-pound units are to be regarded as standard. No other units of measurement are included
in this standard.
1.4 The following precautionary caveat pertains only to the test method portion, Section 12, 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 and health practices and determine the applicability of regulatory limitations prior to use.
2. Referenced Documents
2
2.1 ASTM Standards:
A262 Practices for Detecting Susceptibility to Intergranular Attack in Austenitic Stainless Steels
A342/A342M Test Methods for Permeability of Weakly Magnetic Materials
A380A380/A380M 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 Chemical Analysis of Steel Products
A967A967/A967M Specification for Chemical Passivation Treatments for Stainless Steel Parts
D3951 Practice for Commercial Packaging
E18 Test Methods for Rockwell Hardness of Metallic Materials
3
E92 Test Method for Vickers Hardness of Metallic Materials (Withdrawn 2010)
E384 Test Method for Knoop and Vickers Hardness of Materials
F593 Specification for Stainless Steel Bolts, Hex Cap Screws, and Studs
F606F606/F606M Test Methods for Determining the Mechanical Properties of Externally and Internally Threaded Fasteners,
Washers, and Rivets (Metric) F0606_F0606M Direct Tension Indicators, and Rivets
F788/F788MF788 Specification for Surface Discontinuities of Bolts, Screws, and Studs, Inch and Metric Series
F1470 Practice for Fastener Sampling for Specified Mechanical Properties and Performance Inspection
2.2 ASME Standard:
4
B 18.3 Socket Cap, Shoulder and Set Screws (Inch Series)
5
2.3 JIS Standard:
JIS G 4309 Stainless Steel Wires
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 June 1, 2012May 1, 2015. Published December 2012July 2015. Originally approved in 1986. Last previous edition approved in 20102012 as
F879-10.-12. DOI: 10.1520/F0879-12.10.1520/F0879-15.
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
The last approved version of this historical standard is referenced on www.astm.org.
4
Available from Global Engineering Documents, 15 Inverness Way, East Englewood, CO 80112-5704, http://www.global.ihs.com.American Society of Mechanical
Engineers (ASME), ASME International Headquarters, Two Park Ave., New York, NY 10016-5990, http://www.asme.org.
5
Available from Japanese Industrial Standards Committee (JIS) 1-3-1 Kasumigaseki, Chiyoda-ku, Tokyo 100-8901, JAPAN. http://www.jisc.go.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
1
---------------------- Page: 1 ----------------------
F879 − 15
TABLE 1 Mechanical Property Requirements
A B
Full Size Product Tests Machined Specimen Tests Core Hardness
Alloy
C
Alloy Group
Tensile Extension Tensile Yield Elongation
Condition Vickers Rockwell
min
Strength ksi Strength ksi Strengt
...
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