Designation: A 574 – 04
Standard Specification for
Alloy Steel Socket-Head Cap Screws
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This standard is issued under the fixed designation A 574; 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 (e) 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
2
covers the requirements for
quenched and tempered alloy steel hexagon socket-head cap
screws, 0.060 through 4 in. in diameter where high strength is
required.
NOTE 1—A complete metric companion to Specification A 574 has
been developed—A 574M; therefore no metric equivalents are presented
in this specification.
1.2 The following hazard 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
2.1 ASTM Standards:
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A 751 Test Methods, Practices, and Terminology for
Chemical Analysis of Steel Products
D 3951 Practice for Commercial Packaging
E 3 Practice of Preparation of Metallographic Specimens
E 112 Test Methods for Determining the Average Grain
Size
E 384 Test Method for Microindentation Hardness of Ma-
terials
F 606 Test Methods for Determining the Mechanical Prop-
erties of Externally and Internally Threaded Fasteners,
Washers, and Rivets
F 788/F 788M Specification for Surface Discontinuities of
Bolts, Screws, and Studs, Inch and Metric Series
2.2 ANSI/ASME Standards:
B1.1 Unified Screw Threads
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B18.3 Socket Cap, Shoulder, and Set Screws
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B18.24.1 Part Identifying Number (PIN) Code System
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2.3 Federal Standard:
H-28 Handbook of Thread Dimensions
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3. Terminology
3.1 Definitions:
3.1.1 Definitions of discontinuities covered by 10.2 follow:
3.1.2 crack—clean crystalline break passing through the
grain or grain boundary without inclusion of foreign elements.
3.1.3 inclusions—particles of nonmetallic impurities, usu-
ally oxides, sulfides, silicates, and such, which are mechani-
cally held in the steel during solidification.
3.1.4 nicks or pits—depressions or indentations in the
surface of the metal.
3.1.5 seam or lap—noncrystalline break through the metal
which is inherently in the raw material.
4. Ordering Information
4.1 Orders for socket head cap screws under this specifica-
tion shall include the following:
4.1.1 ASTM designation and year of issue.
4.1.2 Quantities (number of pieces by size).
4.1.3 Size and length.
4.2 Orders for socket head cap screws may include the
following optional requirements:
4.2.1 Inspection at point of manufacture.
4.2.2 Coating, if a protective finish other than black oxide
(thermal or chemical) is required, it must be specified.
4.2.3 Certified test reports (see 11.2).
4.2.4 Additional testing (see 11.3).
4.2.5 Special packaging (see 16.1.2).
4.2.6 Supplementary requirements (see S1).
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This specification is under the jurisdiction of ASTM Committee F16 on
Fasteners and is the direct responsibility of Subcommittee F16.02 on Steel Bolts,
Nuts, Rivets, and Washers.
Current edition approved Aug. 1, 2004. Published August 2004. Originally
approved in 1967. Last previous edition approved in 2000 as A 574 – 00.
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For ASME Boiler and Pressure Vessel Code applications see related Specifi-
cation SA-574 in Section II of that code.
3
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.
4
Available from American National Standards Institute (ANSI), 25 W. 43rd St.,
4th Floor, New York, NY 10036.
5
Available from American Society of Mechanical Engineers (ASME), ASME
International Headquarters, Three Park Ave., New York, NY 10016-5990.
6
Available from General Services Administration, Specification and Consumer
Information Distribution Branch, Bldg. 197, Washington Navy Yard, Washington,
DC 20407.
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*A Summary of Changes section appears at the end of this standard.
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