U.S. FREE SHIPPING ORDERS OVER $299.  |  VOLUME DISCOUNTS ORDERS OF 5 OR MORE.  |  WE HAVE ADDITIONAL INVENTORY, CONTACT US FOR ANY PART YOU DON'T FIND.
British Pipe Standard fittings are amongst the most popular of all foreign threads in the world. These threads come in 2 versions: parallel (BSPP), and tapered (BSPT). The thread flank angle for both tapered and parallel British threads is 55°. NOTE: It is a common mistake to identify a BSPT (tapered) as an NPT. Remember that NPT threads have a 60° thread flank angle, and BSPT has a 55° angle (this can be verified with a thread gauge). Although BSP is a foreign thread, it isn't metric. This is why it comes in imperial sizes: 1/8, 1/4, 1/2, 3/4, and so on. 
BSPP-tech 

  • •Thread conforms to ISO 228-1
  • •Port conforms to ISO 1179
  • •Pitch & diameter measured in inches e.g. G1/4-19
  • •Parallel threads require o-ring, crush washer, gasket or metal to metal seal between connectinos for pressure tight connection
  • •Thread angle is 55°
  • Not interchangeable with SAE or NPT(F)
 BSPP Thread Specification
(BSPP Indicator: G)
SizeNominal Size (in)Thread Size (mm)
2 1/8 9.728 - 28
4 1/4 13.157 - 19
6 3/8 16.662 - 19
8 1/2 20.955 - 14
10 5/8 22.911 - 14
12 3/4 26.441 - 14
14 7/8 30.201 - 14
16 1 33.249 - 11
18 1-1/8 37.897 - 11
20 1-1/4 41.910 - 11
22 1-3/8 44.323 - 11
24 1-1/2 47.803 - 11
28 1-3/4 53.746 - 11
32 2 59.614 - 11
Thread Size = Male Thread OD - Threads per Inc

CONTENT HERE

CONTENT HERE

CONTENT HERE

CONTENT HERE

CONTENT HERE

CONTENT HERE

WHAT OUR CUSTOMERS ARE SAYING:
Fittings Space 2026 All Rights Reserved | Contact Us | Privacy Policy | Terms & Conditions | Set Up Account
PayPal Acceptance Mark