Countersunk head screw ASME 18.3, plain steel alloy, UNC (comparable with ISO metric thread)
ASME B18.3 steel alloy plain UNC
SCR-FLT-SOC-ALLOY-1/4_20X1 1/2
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1 INCH (in) = 25.4 mm
The "alloy" strength class is comparable with the metric strength class 12.9
The hexagon socket screws according to ASME B 18.3 have no strength class designation on the head as they only have one strength class according to the ASTM F835 mechanical properties.
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