26 tpi thread

26 tpi thread

This topic has 5 replies, 4 voices, and was last updated 1 April 2022 at 20:33 by Brian Morehen.

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1 April 2022 at 16:44 #592416
Peter Howell 1
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@peterhowell1
I need to make an adaptor to pressure test my loco boiler. The safety valve has a 26tpi thread.

Would this be Brass or Cycle ? Both have 26 tpi, brass is 55 deg. cycle 60
Advert

1 April 2022 at 16:44 #28647
Peter Howell 1
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@peterhowell1
1 April 2022 at 17:02 #592428
Howard Lewis
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@howardlewis46836
PURELY a guess, but B S Brass would be my choice.

Can you cut pieces of bar with each of the threads to use as a gauge?

1/4 BSF is 26 tpi, is Whit thread form same as B S B, if that is any help.

Howard
1 April 2022 at 17:54 #592434
Clive Brown 1
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@clivebrown1
After many years of reading ME through the heyday of designs by Martin Evans, Don Young etc, I have never seen a BSC thread specified for a steam application. Always Brass.
1 April 2022 at 18:07 #592436
Peter Howell 1
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@peterhowell1
Thanks. I thought it probably would be brass but I thought I'd check.
1 April 2022 at 20:33 #592464
Brian Morehen
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@brianmorehen85290
Almost Certain British standard brass as they are all 26 threads if i remeber right

Regards Bee.M
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