Wednesday, December 25, 2019

Q. What does 3/8” or ¾” means in thread nomenclature?

3/8” or ¾” means the nominal OD of the bolt. For Course threads the TPI will be 16 and for fine threads the TPI will be 20. Actually that’s according to the American standards. Metric standards define it in eg. M10 * 1.5 where, 10 is the nominal diameter and 1.5 is the pitch. If Pitch is not mentioned, then we take it as that thread is belonging to the course group.

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