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This specification covers chemical and mechanical requirements for eight property classes of hex and hex-flange carbon and alloy steel nuts for general structural and mechanical uses on bolts, studs, and other externally threaded parts.
Formerly under the jurisdiction of Committee F16 on Fasteners, this specification was withdrawn in June 2021 and replaced by Specificationfor Carbon and Alloy Steel Nuts (Inch and Metric) as a dual unit standard.
1.1 This specification covers chemical and mechanical requirements for eight property classes of hex and hex-flange carbon and alloy steel nuts for general structural and mechanical uses on bolts, studs, and other externally threaded parts.
1.2 Classes 8S3 and 10S3 nuts have atmospheric corrosion resistance and weathering characteristics comparable to those of the steels covered in Specification A588/A588M. The atmospheric corrosion resistance of these steels is substantially better than that of carbon steel with or without copper addition (see 6.2). When properly exposed to the atmosphere, these steels can be used bare (uncoated) for many applications.
1.3 The nut size range for which each class is applicable is given in the table on mechanical requirements.
1.4 Appendix X1 gives guidance to assist designers and purchasers in the selection of a suitable class.
1.5 Appendix X2 gives data on the properties of slotted hex nuts and hex jam nuts.
1.6 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.
A153/A153M Specification for Zinc Coating (Hot-Dip) on Iron and Steel Hardware
A325M Specification for Structural Bolts, Steel, Heat Treated 830 MPa Minimum Tensile Strength (Metric)
A394 Specification for Steel Transmission Tower Bolts, Zinc-Coated and Bare
A490M Specification for High-Strength Steel Bolts, Classes 10.9 and 10.9.3, for Structural Steel Joints (Metric)
A588/A588M Specification for High-Strength Low-Alloy Structural Steel, up to 50 ksi [345 MPa] Minimum Yield Point, with Atmospheric Corrosion Resistance
A751 Test Methods, Practices, and Terminology for Chemical Analysis of Steel Products
B695 Specification for Coatings of Zinc Mechanically Deposited on Iron and Steel
D3951 Practice for Commercial Packaging
F568M Specification for Carbon and Alloy Steel Externally Threaded Metric Fasteners (Metric)
F606M Test Methods for Determining the Mechanical Properties of Externally and Internally Threaded Fasteners, Washers, and Rivets (Metric)
F812 Specification for Surface Discontinuities of Nuts, Inch and Metric Series
F1789 Terminology for F16 Mechanical Fasteners
G101 Guide for Estimating the Atmospheric Corrosion Resistance of Low-Alloy Steels
ANSI StandardsB 1.13M Metric Screw Threads--M Profile B 18.104.22.168M Metric Hex Nuts, Style 1 B 22.214.171.124M Metric Hex Nuts, Style 2 B 126.96.36.199M Metric Slotted Hex Nuts B 188.8.131.52M Metric Hex Flange Nuts B 184.108.40.206M Metric Hex Jam Nuts B 220.127.116.11M Metric Heavy Hex Nuts
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ASTM A563M-07(2013), Standard Specification for Carbon and Alloy Steel Nuts (Metric) (Withdrawn 2021), ASTM International, West Conshohocken, PA, 2013, www.astm.orgBack to Top