ASTM F879M - 02a(2008)

    Standard Specification for Stainless Steel Socket Button and Flat Countersunk Head Cap Screws (Metric)

    Active Standard ASTM F879M | Developed by Subcommittee: F16.04

    Book of Standards Volume: 01.08


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    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 A155, 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.

    This abstract is a brief summary of the referenced standard. It is informational only and not an official part of the standard; the full text of the standard itself must be referred to for its use and application. ASTM does not give any warranty express or implied or make any representation that the contents of this abstract are accurate, complete or up to date.

    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 A 1-50 in an annealed condition at 585 MPa maximum,

    1.2.2 Austenitic Class A155 in a cold worked condition at 550 MPa minimum, and

    1.2.3 Austenitic Class A 1-70 in a cold-worked condition at 700 MPa minimum.

    1.3 UnitsThe 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 (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.

    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

    F606M Test Methods for Determining the Mechanical Properties of Externally and Internally Threaded Fasteners, Washers, and Rivets (Metric)

    F738M Specification for Stainless Steel Metric Bolts, Screws, and Studs

    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

    ASME Standards

    B18.3.5M Hexagon Socket Flat Countersunk Head Cap Screws (Metric Series)


    ICS Code

    ICS Number Code 21.060.10 (Bolts, screws, studs)

    UNSPSC Code

    UNSPSC Code 31161501(Cap screws )


    DOI: 10.1520/F0879M-02AR08

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