3/8" BSF
most likely. Have you tried a 3/8" coarse thread bolt? A 3/8" UNC will fit in a 3/8" BSC threaded hole (although the thread pitches are different). However, a 3/8" UNF will not go in a 3/8" BSF hole.
most likely. Have you tried a 3/8" coarse thread bolt? A 3/8" UNC will fit in a 3/8" BSC threaded hole (although the thread pitches are different). However, a 3/8" UNF will not go in a 3/8" BSF hole.
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