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ASME B18.2.1-2012

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

This Standard covers the dimensional requirements for nine product types of inch series bolts and screws recognized as American National Standard.

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American Society of Mechanical Engineers [ASME]


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As the voice of the U.S. standards and conformity assessment system, the American National Standards Institute (ANSI) empowers its members and constituents to strengthen the U.S. marketplace position in the global economy while helping to assure the safety and health of consumers and the protection of the environment.

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