HDG BOLT AND NUT FULL THREAD (FT)

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M6 -M24  Hot DIP Galvanized HDG hex bolt and nut 

A bolt is a form of threaded fastener with an external male thread.

Bolts are thus closely related to, and often confused with, screws.

A hex cap screw is a cap screw with a hexagonal head, designed to be driven by a wrench (spanner).

An ASME B18.2.1 compliant cap screw has somewhat tighter tolerances than a hex bolt for the head height and the shank length.

The nature of the tolerance difference allows an ASME B18.2.1 hex cap screw to always fit where a hex bolt is installed but a hex bolt could be slightly too large to be used where a hex cap screw is designed in.