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B18-2-1 Square, Hex, Heavy Hex, and Askew Head Bolts and Hex, Heavy Hex, Hex Flange, Lobed Head, and Lag Screws (Inch Series)

B18-2-1
Square, Hex, Heavy
Hex, and Askew Head
Bolts and Hex, Heavy
Hex, Hex Flange,
Lobed Head, and Lag
Screws (Inch Series)

American National Standards Committee B18 for the standardization of bolts, screws, nuts,
rivets, and similar fasteners was organized in March 1922 as Sectional Committee B18, under
the aegis of the American Engineering Standards Committee [AESC, later the American Standards
Association (ASA), then the United States of America Standards Institute (USASI), and, as of
October 6, 1969, the American National Standards Institute (ANSI)], with the Society of
Automotive Engineers (SAE International) and The American Society of Mechanical Engineers
(ASME) as joint sponsors. Subcommittee 2 was subsequently established and charged with the
responsibility for technical content of standards covering wrench head bolts and nuts.



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