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2BA but unlikely or 3/16" BSC
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The M5 does thread in, but there's play and will probably strip in use, I reckon.
Anyone care to hazard a guess at what thread I'm looking for?I can't tell you what to look for, but what you're probably looking at is a badly worn M5 thread. The best fit for something with a pitch close to 0.8mm and a diameter between 5 and 6 would be 7/32"×32TPI ME, and you could probably tap out an M5×0.8 female to that size quite successfully, as the flank angle is close enough and the pitch error is <1%
freezing77
gbj_tester
@Jon.
Thread experts: I've a frame with a built in cantilever hanger that doesn't accept either an M6 (too big) or an M5 (too small) bolt. The M5 does thread in, but there's play and will probably strip in use, I reckon.
Anyone care to hazard a guess at what thread I'm looking for?