BSPT & BSPP Threads

BSPT & BSPP Threads

BSPT & BSPP THREADS

BSP is BRITISH STANDARD PIPE
BSPT is BRITISH STANDARD PIPE TAPER
BSPP is BRITISH STANDARD PIPE PARALLEL		 Also known as Whitworth 55° Thread Form
Thread form per AS 1722.1, BS 21, ISO 7
Thread form per AS 1722.2, ISO 228
BSPT male threads seal against threads of fixed BSPT female.
Contact is made on the flanks of the threads.
Use of a thread sealant is recommended for BSPT male to BSPT female connections.
Measure the BSPT male thread OD and female thread ID at the first full thread near the end of the fitting.
BSPT male and BSPP male with conical 30° seat (60° included angle) seal against matching conical 30° seat
of BSPP female swivel.
BSPP O Ring male connector has straight threads and O Ring with metal Retaining Ring. It seals against flat external surface
of BSPP female port.
BSPP male, with chamfer to locate Bonded Seal also seals against flat external surface of BSPP female port.
Surface irregularities require a Spot Face to ensure effective sealing. Elbows and tees have Lock Nut to allow orientation of
fitting to required direction.
BSPP male and BSPP female flat face swivel require a suitable soft washer between faces to seal.
For low working pressure.
BSPT & BSPP Threads Dimensions

BSPT & BSPP
SIZE & PITCH		 DASH
SIZE		 BSPT MALE
THREAD OD		 BSPP MALE
THREAD OD		 BSPT FEMALE
THREAD ID		 BSPP FEMALE
THREAD ID
inch - TPI   mm inch mm inch mm inch mm inch
1/8 - 28 -02 9,5 0.37 9,6 0.38 8,4 0.33 8,6 0.34
1/4 - 19 -04 12,8 0.50 13,0 0.51 11,2 0.44 11,9 0.47
3/8 - 19 -06 16,3 0.64 16,5 0.65 14,7 0.59 15,2 0.60
1/2 - 14 -08 20,4 0.80 20,8 0.82 18,3 0.72 19,1 0.75
5/8 - 14 -10 22,5 0.89 22,8 0.90 20,6 0.81 20,8 0.82
3/4 - 14 -12 25,9 1.02 26,3 1.04 23,9 0.94 24,6 0.97
1 - 11 -16 32,6 1.28 33,1 1.30 29,7 1.17 30,7 1.21
1.1/4 - 11 -20 41,1 1.62 41,8 1.64 38,6 1.52 39,4 1.55
1.1/2 - 11 -24 47,0 1.85 47,7 1.88 44,5 1.75 45,5 1.79
2 - 11 -32 58,6 2.31 59,5 2.34 56,4 2.22 57,4 2.26
2.1/2 - 11 -40 74,1 2.92 75,1 2.95 71,9 2.83 72,6 2.86
3 - 11 -48 86,6 3.41 87,9 3.46 84,6 3.33 85,4 3.36
Thread size refers to the nominal bore of the pipe.
Subtract approx. 1/4" (6mm) from thread diameter
measurement for nominal pipe size.
Pitch is Threads Per Inch (TPI).
"Gas", "R" & "G" also refer to BSP.
"Male Iron (Pipe)" may be BSP or NPT.