Hexagon Socket Head Cap Screw ASME 18.3, plain steel alloy, UNC (comparable with ISO metric thread)
ASME B18.3 steel alloy plain UNC
SCR-CYL-UNC-12.9-HS5/16-3/8IN-16X83MM
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1 INCH (in) = 25, 4 mm
The alloy strength class is comparable with metric strength class 12.9
Socket screws to ASME B 18.3 do not have the strength class marked on the head since, according to ASTM 574, they have only one strength class.
Standard thread tolerance according to ASME B1.1 = 3A (for external thread)
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