Button head screw, inch ASME B18.3, steel alloy, phosphated, UNC (standard thread)
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Button head screw, inch ASME B18.3, steel alloy, phosphated, UNC (standard thread)
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1 INCH (in) = 25.4 mm. The "alloy" strength class is comparable to metric strength class 12.9. Hexagon socket screws in accordance with ASME B 18.3 do not have the strength class specified on the head, as they have only one strength class in accordance with ASTM F835 mechanical properties. Standard thread tolerance in accordance with ASME B1.1 = 3A (for external thread)
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