2 1/2″ BSPT thread gauge-R2 1/2 x 11 BSPT thread ring plug gage

2 1/2" BSPT (R) thread gauge ring & plugR 2 1/2 x 11 BSPT 2 1/2" thread ring gage & plug gage

2 1/2″ BSPT (R) thread gauge ring & plug

R 2 1/2 x 11 BSPT 2 1/2″ thread ring gage & plug gage

  • Thread form: BSPT (R) 
  • DEC. : 2.5
  • Frac.: 2 1/2″
  • TPI: 11

In stock, can be sent out the next day.

BSPT (R) thread gauges, the full name is British Standard Pipe Taper thread gauges with 55° thread angel, having 1:16 taper thread.

Each R 2 1/2 BSP Taper thread gage 100% calibrated with quality assurance.

RH= right hand  LH=left hand both available

if clients need BSPT (R) 2 1/2″ right hand thread gauge, then no need special notes.

if clients need R2 1/2 x 11 BSPT left hand thread gage, then need special notes.

For example: R 2 1/2 x 11 BSPT-LH thread ring gage 1 pc

BSPT 2 1/2″ thread’s basic size

Diameter : 2 1/2  n=11  P=2.309  h=1.479 Major Dia.=75.184  Pitch Dia.=73.705  Minor Dia.=72.226

R 2 1/2 BSPT thread gauge calibration certificate

If needed, one long form calibration certificate from professional third party testing lab accredited to ISO/IEC 17025 can be supplied. gaugesools also can provide UKAS certificates if needed.These calibration certificates need extra cost, if clients need them,please tell in advance.

About us

gaugestools is a professional manufacturer and supplier of thread ring gages and thread plug gauges,including GO/NOGO, RH/LH(right hand and left hand).We have rich ranges of thread gauges, including UN, Metric, ACME, stub-ACME,BSPP (G), BSPT (R), NPT, NPTF, Trapezoidal, and Whitworth etc.

Standard: ISO 228-1  BS21

Worldwide shipment , usually taking 3-4 days clients can receive goods.

How to use R 2 1/2 BSPT ring plug gage

  • BSPT plug gauge: it controls workpiece’s internal thread’ s pitch diameter and major diameter’s sizes. when screw in the plug gage,   the internal thread’s large end should be within plug gage’s step end(-) and large end (+), or be flush with one of the gauges ends.     otherwise, the internal thread is unqualified.
  • BSPT ring gauge: it controls workpiece’s external thread’s pitch diameter and minor diameter, when screw in the ring gage , the external thread’s small end should be within ring gage’s step end(-) and large end (+), or be flush with one of the gauges ends. otherwise, the external thread is unqualified.

The pictures are just for reference. As too many items in stock, we haven’t taken pictures one by one, If clients need  actual goods’s pictures, we are happy to take.

Check the full range of BSPT (R) thread gauge in stock


We accept payment of T/T(bank transfer), Paypal, Credit Cards, and West Union etc.

2 1/2" BSPT (R) thread gauge ring & plug qualityR2 1/2 x 11 BSPT 2 1/2" thread ring gage & plug gage delivery