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Colin Heseltine	23/08/2023 20:10:30
744 forum posts 375 photos	I have a Stuart 504 boiler and need to make a blanking plug for the safety valve. I appears to be a 5/16" x 26 tpi. Need to purchase suitable tap and die. Is it going to be a BSB (British Standard Brass or a BSC (British Standard Cycle). These are both available at 5/16"x26. I would guess BSB but would like confirmation before ordering. Thanks, Colin Edited By Colin Heseltine on 23/08/2023 20:10:58
JasonB	23/08/2023 20:31:22
25215 forum posts 3105 photos 1 articles	My old paper catalogue lists them as brass and if you look on Stuarts's site under tools the 5/16" x 26tpi taps and dies are BSB
Colin Heseltine	23/08/2023 23:03:31
744 forum posts 375 photos	Jason, Many thanks. Tap and Die now ordered. Regards, Colin
Clive Brown 1	24/08/2023 08:40:27
1050 forum posts 56 photos	Pedant alert! although often used, the term "BSB" is incorrect, there isn't a BS for Brass Threads AFAIK. My copy of Machinery's Handbook doesn't seem to mention Brass Thread, or Cycle Thread for that matter, but In 50+ years of model engineering I can't ever remember seeing Cycle Thread specified in a design, always Brass for 26 tpi.
noel shelley	24/08/2023 09:53:13
2308 forum posts 33 photos	My copy of The metalworkers Data Book (2009 ) lists BSB and tells me that like many old british threads it is witworth form WF. Interestingly it does NOT give a thread form for the other 26tpi system, BSC, is it 55, 60 or some other ? Noel.
JasonB	24/08/2023 10:09:30
25215 forum posts 3105 photos 1 articles	Cycle is 60deg

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