ASTM F879-10

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 hexagon socket button and flat countersunk head cap screws intended for use in applications requiring general corrosion resistance. The following three conditions are covered: austenitic alloy group 1 AF in an annealed condition, austenitic alloy group 1 CW in a cold-worked condition, and austenitic alloy group 1 CW1 in a cold worked condition. Screws shall be formed by upsetting or extruding, or both and shall be roll threaded and annealed to obtain maximum corrosion resistance and minimum permeability. The chemical composition, which shall be determined by chemical analysis, shall conform to the requirements for carbon, manganese, phosphorus, sulfur, silicon, chromium, nickel, copper, and molybdenum. The screws shall be subjected to tension tests and shall conform to the breaking strength, tensile strength, extension, yield strength, elongation, and Vickers and Rockwell hardness requirements. Corrosion test shall also be conducted to determine the susceptibility of the specimens to intergranular corrosion.
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.

General Information

• Status: Historical
• Publication Date: 30-Apr-2010
• ICS: 21.060.10 - Bolts, screws, studs
• Technical Committee: F16 - Fasteners
• Drafting Committee: F16.04 - Nonferrous Fasteners

Relations

• Replaces: ASTM F879-02a(2008) - Standard Specification for Stainless Steel Socket Button and Flat Countersunk Head Cap Screws
• Effective Date: 01-May-2010
• Replaced By: ASTM F879-12 - Standard Specification for Stainless Steel Socket Button and Flat Countersunk Head Cap Screws
• Effective Date: 01-Jun-2012
• Referred By: ASTM C1921/C1921M-22 - Standard Test Method for Comparative Impact Testing of Gypsum Panel Outside 90° Corner Systems
• Effective Date: 01-May-2010

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation:F879 −10
StandardSpecification 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 Department of Defense.
1. Scope* cal Analysis of Steel Products
A967Specification for Chemical Passivation Treatments for
1.1 This specification covers the chemical and mechanical
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.
E92TestMethodforVickersHardnessofMetallicMaterials
3
1.2 Two groups of austenitic stainless steel alloys and three
(Withdrawn 2010)
conditions are covered. See Table 1 and Table 2.
E384Test Method for Knoop and Vickers Hardness of
Materials
1.3 Units—The values stated in inch-pound units are to be
regarded as standard. No other units of measurement are F593 Specification for Stainless Steel Bolts, Hex Cap
Screws, and Studs
included in this standard.
F606Test Methods for Determining the Mechanical Proper-
1.4 The following precautionary caveat pertains only to the
ties of Externally and Internally Threaded Fasteners,
test method portion, Section 12, of this specification: This
Washers, Direct Tension Indicators, and Rivets
standard does not purport to address all of the safety concerns,
F788/F788MSpecification for Surface Discontinuities of
if any, associated with its use. It is the responsibility of the user
Bolts, 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:
4
B18.3Socket Cap, Shoulder and Set Screws (Inch Series)
2. Referenced Documents
2
2.1 ASTM Standards:
3. Classification
A262Practices for Detecting Susceptibility to Intergranular
3.1 The designation of the alloy group and condition of this
Attack in Austenitic Stainless Steels
specification shall be consistent with the stainless steel desig-
A342/A342MTest Methods for Permeability of Feebly
nations in Specification F593.
Magnetic Materials
3.2 Screws shall be designated by group and condition (for
A380Practice for Cleaning, Descaling, and Passivation of
example, F879 Group 1 Condition AF).
Stainless Steel Parts, Equipment, and Systems
A555/A555MSpecification for General Requirements for
4. Ordering Information
Stainless Steel Wire and Wire Rods
4.1 Ordersformaterialunderthisspecificationshallinclude
A751Test Methods, Practices, and Terminology for Chemi-
the following information:
4.1.1 Quantity (number of pieces of each item).
4.1.2 Name of the screw, SBHCS or SFHCS.
1
This specification is under the jurisdiction of ASTM Committee F16 on
4.1.3 Dimensions, including nominal thread designation,
Fasteners and is the direct responsibility of Subcommittee F16.04 on Nonferrous
Fasteners.
thread pitch, and nominal screw length (inches). A standard
Current edition approved May 1, 2010. Published June 2010. Originally
part number may be used for this definition.
approved in 1986. Last previous edition approved in 2008 as F879–02a(2008).
DOI: 10.1520/F0879-10.
2 3
For referenced ASTM standards, visit the ASTM website, www.astm.org, or The last approved version of this historical standard is referenced on
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM www.astm.org.
4
Standards volume information, refer to the standard’s Document Summary page on Available from Global Engineering Documents, 15 Inverness Way, East
the ASTM website. Englewood, CO 80112-5704, http://www.global.ihs.com.
*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

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F879−10
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
...

This document is not anASTM standard and is intended only to provide the user of anASTM 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:F879–02a (Reapproved 2008) Designation: F879 – 10
Standard Specification for
Stainless Steel Socket Button and Flat Countersunk Head
1
Cap Screws
ThisstandardisissuedunderthefixeddesignationF879;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginal
adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.Asuperscript
epsilon (´) indicates an editorial change since the last revision or reapproval.
This standard has been approved for use by agencies of the Department of Defense.
1. Scope*
1.1 Thisspecificationcoversthechemicalandmechanicalrequirementsforstainlesssteelinchhexagonsocketbutton(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.
1.2The following three conditions are covered:
1.2.1Austenitic alloy group 1 AF in an annealed condition at 85 ksi maximum,
1.2.2Austenitic alloy group 1 CW in a cold-worked condition at 80 ksi minimum, and
1.2.3Austenitic alloy group 1 condition CW1 in a cold worked condition at 102 ksi minimum.
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 Feebly 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 Chemical 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 Materials
E92 Test Method for Vickers Hardness of Metallic Materials
E384 Test Method for Knoop and Vickers Hardness of Materials
F593 Specification for Stainless Steel Bolts, Hex Cap Screws, and Studs
F606 TestMethodsforDeterminingtheMechanicalPropertiesofExternallyandInternallyThreadedFasteners,Washers,Direct
Tension Indicators, and Rivets
F788/F788M 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:
3
B 18.3 Socket Cap, Shoulder and Set Screws (Inch Series)
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, 2008.2010. Published August 2008.June 2010. Originally approved in 1986. Last previous edition approved in 20022008as
F879 – 02a(2008). DOI: 10.1520/F0879-02AR08.10.1520/F0879-10.
2
For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at [e-mail]. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
3
Available from Global Engineering Documents, 15 Inverness Way, East Englewood, CO 80112-5704, http://www.global.ihs.com.
*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 – 10
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
Strength ksi min Strength ksi Strength ksi %min
AF 85 max 0.6D 85 max 55 max 40 210 max 95 HRB max
All AF 85 max 0.6D 85 max 55 max 40 210 max 95 HRB max
CW 80 min 0.4D 80 min 40 min 25 150 min 50 HRA min
All CW 80 min 0.4D 80 min 40 min 25 150 min 50 HRA min
CW1 102 min 0.4D
...