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O.D. = 0.2087″ — 28.25tpi

3/16″ BSF — O.D. = 0.1875″ — 32tpi

3/16″ BSW — O.D. = 0.1875″ — 24tpi

7/32″ BSF — O.D. = 0.2188″ — 28tpi

While the 7/32″ BSF thread size is documented there is no BSW thread listed in that size.

A 5mm diameter thread is in the same ball park and has, within a “gnat’s nagger”, a 31.5tpi thread.

These are the likely candidates, there are others and it is not unknown for manufacturers to have their own threads just to make life difficult.