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Countersunk head screw
Countersunk head screw - 1
Countersunk head screw - 2

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Countersunk head screw

ASME 18.3 steel alloy plain UNC (standard thread)

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Available in 68 versions

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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.