Just Google it Henri.
https://www.google.co.uk/search?rlz=1C2OKWM_enGB771GB771&source=hp&ei=ZL0wWtfPL8SRgAb294_QBg&q=3%2F8++bsp+to+1%2F4+bsp+reducers&oq=3%2F8++bsp+to+1%2F4+bsp+reducers&gs_l=psy-ab.12..33i22i29i30k1.3373.57636.0.60028.35.33.1.1.1.0.113.2827.29j4.33.0....0...1c.1.64.psy-ab..0.35.2859...0j0i131k1j0i7i30k1j0i7i10i30k1j0i30k1j0i10i30k1j0i22i30k1j0i22i10i30k1.0.--4GqE-7VXQ

Ron

email (option): ronpier@talk21.com

Hi Ron

Is BSPP the same thread as Whitworth?

Reason for asking is I have a few Whitworth taps and I have just ordered some BSPP fittings to do some work on breathers for my Triumph.

Regards

Pat

email (option): sacombsashtrees@hotmail.com

Just answered my own question......not really (1/4 Whitworth at 20 TPI abd 1/4 BSP at 19 TPI).

email (option): sacombsashtrees@hotmail.com

Yeah right Pat. BSP parallel and BSP tapered are a different TPI to Whitworth.....Same thread angle I think. Ron

email (option): ronpier@talk21.com