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Richard Clare 1	30/03/2021 18:51:53
1 forum posts	Hi All, I have a brass door handle with a 5/32" xd 30 TPI grub screw. Can you tell me what thread this is? Could it be BSB?
John Baron	30/03/2021 20:03:19
520 forum posts 194 photos	Hi Richard, Could be Cycle thread, 5/32 CSI 30 tpi.
SillyOldDuffer	30/03/2021 20:31:04
10668 forum posts 2415 photos	Fitting a bathroom privacy lock last week I graunched the grub screw with an incorrectly sized screwdriver and had to re-slot it. Taking the grub out, it appeared to be M4 with an unusually coarse pitch. Reminded me of Meccano, which is 5/32" Whitworth, 32 tpi, but I didn't try one to confirm! Dave
Howard Lewis	31/03/2021 17:29:45
7227 forum posts 21 photos	Unlikely to be BSB since this 26 tpi for all sizes. If it is not a special, some possibles might be: Cycle thread 5/32 x 32 tpi, Whit form. CEI is 60 degree. It might be an undersize 8 - 32 UNC (0.164 OD x 32 tpi ) again 60 degree form. M4 would approximate to 0.157 x 36 tpi so unlikely 3 BA is 4.1 mm ( 0.161 0 OD ) x 0.73 mm (34.8 tpi approx ) Pitch. 47.5 degree form. Howard

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