Question

what is mean by 3/8

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Answer 1

Answer:

3/8 means the third part of a whole of 8

Answer 2

3/8" is the diameter of the bolt shank... the non threaded part that the threads are cut into. Then in 3/8" the coarse thread is 16 threads per inch and for fine thread it is 24 threads per inch. You can easily measure these with a ruler and figure it out...