ASTM F879-12
(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.TABLE 1 Mechanical Property Requirements
Alloy Group
Alloy
Condition
Full Size Product TestsA
Machined Specimen Tests
Core HardnessB
Tensile
Strength ksi
ExtensionC
min
Tensile
Strength ksi
Yield
Strength ksi
Elongation
% min
Vickers
Rockwell
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 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.TABLE 2 Chemical Requirements
Alloy Group
UNS Designation
Alloy
Composition, % maximum except as shown
Carbon
Manganese
Phosphorus
Sulfur
Silicon
Chromium
Nickel
Copper
Molybdeneunm
Austenitic Alloys
1
S30400
304
0.08
2.00
0.045
0.030
1.00
18.0 to 20.0
8.0 to 10.5
1.00
. . .
1
S30403
304L
0.030
2.00
0.045
0.030
1.00
18.0 to 20.0
8.0 to 12.0
1.00
. . .
1
S30500
305
0.12
2.00
0.045
0.030
1.00
17.0 to 19.0
10.5 to 13.0
1.00
. . .
1
S38400
384
0.08
2.00
0.045
0.030
1.00
15.0 to 17.0
17.0 to 19.0
. . .
. . .
1
S30430
18–9LW
0.10
2.00
0.045
0.030
1.00
17.0 to 19.0
8.0 to 10.0
3.0 to 4.0
. . .
1
S30433
302HQ
0.03
2.00
0.045
0.030
1.00
17.0 to 19.0
8.0 to 10.0
3.0 to 4.0
. . .
2
S31600
316
0.08
2.00
0.045
0.030
1.00
16.0 to 18.0
10.0 to 14.0
. . .
2.00 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
. . .
2.00 to 3.0
1.3 Units—The values stated in inch-pound units are to be regarded as standard. No other units of measurement are included...
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Designation:F879 −12
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 U.S. 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 Weakly
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 June 1, 2012. Published December 2012. Originally
part number may be used for this definition.
approved in 1986. Last previous edition approved in 2010 as F879-10. DOI:
10.1520/F0879-12.
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 service@astm.org. 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
---------------------- Page: 1 ----------------------
F879−12
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 H
...
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 − 10 F879 − 12
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 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 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
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
F606 Test Methods for Determining the Mechanical Properties of Externally and Internally Threaded Fasteners, 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:
4
B 18.3 Socket Cap, Shoulder and Set Screws (Inch Series)
3. Classification
3.1 The designation of the alloy group and condition of this specification shall be consistent with the stainless steel designations
in Specification F593.
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, 2010June 1, 2012. Published June 2010December 2012. Originally approved in 1986. Last previous edition approved in 20082010 as
F879 – 02aF879(2008).-10. DOI: 10.1520/F0879-10.10.1520/F0879-12.
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.
*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 − 12
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 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 CW a
...
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