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Engineers Notes on Measuring UNC/UNF British Bolts

UNC/UNF British bolts (such as A102) are measured using the grip length or plain shank portion of the bolt.

However, if you study the picture closely you will notice a small tapered portion between the thread and the shank, this being the run out area of the thread.

This run out area usually measures approximately 1/10” and is not included in the grip length, meaning that the effective grip is always slightly longer than the official specifications would suggest!

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