Treads and Connector Identification BSPT & BSPP Threads


BSPT is British Standard Pipe

Also known as Withworth 55° Thread Form

BSPT is British Standard Pipe Taper

Thred from per As 1722.1, BS 21, ISO 7

BSPT is British Standard Pipe Parallel

Thred from 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 thread sealant is recommended for BSPT male and BSPT female connections.

Measure the BSPT male thread OD and female thread neer the end of fitting.

BSPT male and BSPP male with conical 30° seal of BSPP female swivel.

BSPP O Ring male connector has straight threads and O Ring with metal Retaining. 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. Elboes 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

Thread size refers to the nominal bore of the pipe.

Subtract approximately 1/4"()6 mm from thread meas ure ment for nominal pipe size.

Pitch is Thread Per Inch (TPI).

"Gas","R" & "G" also refer to BSP.

"Male Iron (Pipe)" may be BSP or NPT.