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1.1 This specification covers the chemical and mechanical requirements for two types of quenched and tempered steel bolts and studs for general applications where high strength is required.
1.2 The two types of bolts covered in this specification are:
1.2.1 Type 1—Medium-carbon steel bolts and studs furnished in nominal diameters of 1/4 to 3 in., inclusive.
1.2.2 Type 2—Low-carbon martensite or medium-carbon martensite steel bolts and studs furnished in nominal diameters of 1/4to 1 in., inclusive.
1.3 The bolts and studs shall be Type 1, Type 2, or Type 1 or 2 at manufacturer's option, as specified by the purchaser. When a type is not specified, Type 1 shall be furnished. When elevated temperature applications are involved, Type 1 shall be specified by the purchaser on the order.
1.4 Suitable nuts are covered in Specification A 563. Unless otherwise specified, the grade and style of nut shall be as follows:
|Fastener Size and Surface Finish||Nut Grade and Style|
|1/4 to 11/2 in., plain (or with a coating of insufficient thickness to require over-tapped nuts)||B, hex|
|Over 11/2 to 3 in., plain (or with a coating of insuffi-cient thickness to require over-tapped nuts)||A, heavy hex|
|1/4 to 3 in., zinc-coated (or with a coating thicknessrequiring over-tapped nuts)||DH, heavy hex|
1.5 Unless otherwise specified, washers ordered with bolts shall be furnished to the requirements of Specification F 436.
1.6 The values stated in inch-pound units are to be regarded as the standard. The values given in parentheses are provided for information purposes only.
1.7 Terms used in this specification are defined in Terminology F 1789 unless otherwise defined herein.
2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.
A563 Specification for Carbon and Alloy Steel Nuts
A751 Test Methods, Practices, and Terminology for Chemical Analysis of Steel Products
B695 Specification for Coatings of Zinc Mechanically Deposited on Iron and Steel
F436 Specification for Hardened Steel Washers
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
F1789 Terminology for F16 Mechanical Fasteners
F2329 Specification for Zinc Coating, Hot-Dip, Requirements for Application to Carbon and Alloy Steel Bolts, Screws, Washers, Nuts, and Special Threaded Fasteners
G101 Guide for Estimating the Atmospheric Corrosion Resistance of Low-Alloy Steels
ICS Number Code 21.060.10 (Bolts, screws, studs)
UNSPSC Code 31160000(Hardware)
ASTM A449-04a, Standard Specification for Quenched and Tempered Steel Bolts and Studs, ASTM International, West Conshohocken, PA, 2004, www.astm.orgBack to Top