ASTM F879M-02a(2015)
(Specification)Standard Specification for Stainless Steel Socket Button and Flat Countersunk Head Cap Screws (Metric)
Standard Specification for Stainless Steel Socket Button and Flat Countersunk Head Cap Screws (Metric)
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 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.
1.2 The following three property classes are covered:
1.2.1 Austenitic Class A1-50 in an annealed condition at 585 MPa maximum,
1.2.2 Austenitic Class A1–55 in a cold worked condition at 550 MPa minimum, and
1.2.3 Austenitic Class A1-70 in a cold-worked condition at 700 MPa minimum.
1.3 Units—The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
1.4 The following hazard caveat pertains only to Section 12, Test Methods: This standard does not purport to address all of the safety problems, 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:F879M −02a(Reapproved 2015)
Standard Specification for
Stainless Steel Socket Button and Flat Countersunk Head
1
Cap Screws (Metric)
This standard is issued under the fixed designation F879M; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope A555/A555MSpecification for General Requirements for
Stainless Steel Wire and Wire Rods
1.1 This specification covers the chemical and mechanical
A751Test Methods, Practices, and Terminology for Chemi-
requirements for stainless steel metric hexagon socket button
cal Analysis of Steel Products
(SBHCS) and flat countersunk (SFHCS) head cap screws with
A967Specification for Chemical PassivationTreatments for
nominal thread M3 through M20 intended for use in applica-
Stainless Steel Parts
tions requiring general corrosion resistance.
D3951Practice for Commercial Packaging
1.2 The following three property classes are covered:
E18Test Methods for Rockwell Hardness of Metallic Ma-
1.2.1 Austenitic Class A1-50 in an annealed condition at
terials
585 MPa maximum,
E92TestMethodforVickersHardnessofMetallicMaterials
1.2.2 Austenitic ClassA1–55 in a cold worked condition at 3
(Withdrawn 2010)
550 MPa minimum, and
E384Test Method for Knoop and Vickers Hardness of
1.2.3 Austenitic Class A1-70 in a cold-worked condition at
Materials
700 MPa minimum.
F606MTest Methods for Determining the Mechanical Prop-
1.3 Units—The values stated in SI units are to be regarded erties of Externally and Internally Threaded Fasteners,
Washers, and Rivets (Metric)
asstandard.Nootherunitsofmeasurementareincludedinthis
standard. F738M Specification for Stainless Steel Metric Bolts,
3
Screws, and Studs (Withdrawn 2014)
1.4 ThefollowinghazardcaveatpertainsonlytoSection12,
F788/F788MSpecification for Surface Discontinuities of
Test Methods: This standard does not purport to address all of
Bolts, Screws, and Studs, Inch and Metric Series
the safety problems, if any, associated with its use. It is the
F1470Practice for Fastener Sampling for Specified Me-
responsibility of the user of this standard to establish appro-
chanical Properties and Performance Inspection
priate safety and health practices and determine the applica-
2.2 ASME Standards:
bility of regulatory limitations prior to use.
B18.3.4MHexagon Socket Button Head Cap Screws (Met-
4
ric Series)
2. Referenced Documents
B18.3.5MHexagon Socket Flat Countersunk Head Cap
2
2.1 ASTM Standards: 4
Screws (Metric Series)
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 property class and conditions of
Magnetic Materials
this specification shall be consistent with the stainless steel
A380Practice for Cleaning, Descaling, and Passivation of
designations in Specification F738M.
Stainless Steel Parts, Equipment, and Systems
3.2 The austenitic stainless steel socket screw shall be
designated F879M A1-50, F879M A1–55, or F879M A1-70.
1
This specification is under the jurisdiction of ASTM Committee F16 on
4. Ordering Information
Fasteners and is the direct responsibility of Subcommittee F16.04 on Nonferrous
4.1 Ordersformaterialunderthisspecificationshallinclude
Fasteners.
Current edition approved Sept. 1, 2015. Published November 2015. Originally
the following information:
approved in 1984. Last previous edition approved in 2008 as F879–02a(2008).
DOI: 10.1520/F0879M-02AR15.
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.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
---------------------- Page: 1 ----------------------
F879M−02a (2015)
4.1.1 Quantity (number of pieces of each item). 6.3.1 In the event of a discrepancy, a referee analysis of the
4.1.2 Name of the screw, SBHCS or SFHCS. samples for each lot as specified in 12.1, shall be made in
4.1.3 Dimensions, including nominal thread designation, accordance with 11.3.
thread pitch, and nominal screw length (millimetres). A stan-
dard part number may be used for this definition.
7. Mechanical Properties
4.1.4 Property Class A1-50, A1–55, or A1-70.
7.1 The finished screws shall conform to t
...
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: F879M − 02a (Reapproved 2008) F879M − 02a (Reapproved 2015)
Standard Specification for
Stainless Steel Socket Button and Flat Countersunk Head
1
Cap Screws (Metric)
This standard is issued under the fixed designation F879M; 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.
1. Scope
1.1 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.
1.2 The following three property classes are covered:
1.2.1 Austenitic Class A1-50 in an annealed condition at 585 MPa maximum,
1.2.2 Austenitic Class A1–55 in a cold worked condition at 550 MPa minimum, and
1.2.3 Austenitic Class A1-70 in a cold-worked condition at 700 MPa minimum.
1.3 Units—The values stated in SI units are to be regarded as standard. No other units of measurement are included in this
standard.
1.4 The following hazard caveat pertains only to Section 12, Test Methods:This standard does not purport to address all of the
safety problems, 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
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
F606M Test Methods for Determining the Mechanical Properties of Externally and Internally Threaded Fasteners, Washers, and
Rivets (Metric)
3
F738M Specification for Stainless Steel Metric Bolts, Screws, and Studs (Withdrawn 2014)
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 Standards:
4
B 18.3.4M Hexagon Socket Button Head Cap Screws (Metric Series)
4
B 18.3.5M Hexagon Socket Flat Countersunk Head Cap Screws (Metric 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, 2008Sept. 1, 2015. Published August 2008November 2015. Originally approved in 1984. Last previous edition approved in 20022008
as F879 – 02a.F879 – 02a(2008). DOI: 10.1520/F0879M-02AR08.10.1520/F0879M-02AR15.
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.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
---------------------- Page: 1 ----------------------
F879M − 02a (2015)
3. Classification
3.1 The designation of the property class and conditions of this specification shall be consistent with the stainless steel
designations in Specification F738M.
3.2 The austenitic stainless steel socket screw shall be designated F879M A1-50, F879M A1–55, or F879M A1-70.
4. Ordering Information
4.1 Orders for material under this specification shall include the following information:
4.1.1 Quantity (number of pieces of each item).
4.1.2 Name of the screw, SBHCS or SFHCS.
4.1.3 Di
...
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