Abstact： ASME B18.2.1:2012 pdf download.Square, Hex,HeavyHex, and Askew HeadBolts and Hex, HeavyHex, Hex Flange, Lobed Head, and LagScrews (Inch Series). 2 GENERAL DATA FOR BOTH BOLTS AND SCREWS 2.1 Heads 2.1.1 Top of Head. Top of head shall he full
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