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This topic has 4 replies, 4 voices, and was last updated 31 March 2021 at 17:29 by Howard Lewis.

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30 March 2021 at 18:51 #537147
Richard Clare 1
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@richardclare1
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?
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30 March 2021 at 18:51 #28079
Richard Clare 1
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@richardclare1
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30 March 2021 at 20:03 #537160
John Baron
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@johnbaron31275
Hi Richard,

Could be Cycle thread, 5/32 CSI 30 tpi.
30 March 2021 at 20:31 #537166
SillyOldDuffer
Moderator
@sillyoldduffer
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
31 March 2021 at 17:29 #537284
Howard Lewis
Participant
@howardlewis46836
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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