Square and hex bolts and screws, inch series : including hex cap screws and lag screws / Secretariat, Society of Automotive Engineers, American Society of Mechanical Engineers
Cover title. "ANSI B18.2.1-1981 (revision of B18.2.1-1972)." At head of title : American National Standard. "Date of issuance: December 31, 1981"--P. [ii]. "Reaffirmed 1992"--Cover. Bound with: Supplement to ANSI B18.2.1-1981, Square and hex bolts and screws, inch series.
Action Note:
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