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ASTM F879-23

Current Revision

Standard Specification for Stainless Steel Socket Button, Low and Flat Countersunk Head Cap Screws

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1.1 This specification covers the chemical and mechanical requirements for stainless steel inch hexagon socket button (SBHCS), flat countersunk (SFHCS) head cap screws with nominal thread 0.060 through 0.625 in. and low head (SLHCS) cap screws with nominal thread 0.112 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.

1.5 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.


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.


SDO ASTM: ASTM International
Document Number F879
Publication Date June 1, 2023
Language en - English
Page Count 7
Revision Level 23
Supercedes
Committee F16.04
Publish Date Document Id Type View
June 1, 2023 F0879-23 Revision
May 1, 2015 F0879-15 Revision
June 1, 2012 F0879-12 Revision
May 1, 2010 F0879-10 Revision
Oct. 10, 2002 F0879-02A Revision
June 10, 2002 F0879-02 Revision
Oct. 10, 2001 F0879-98 Revision
Oct. 10, 2001 F0879-01 Revision
April 1, 2020 F0879-15R20 Reaffirmation
May 1, 2008 F0879-02AR08 Reaffirmation