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Ring Groove joint facings Rtj seal caliper Variety of forged steel ball valves


Ideal for ring grooves and ring joint facings applications in oil, gas and petrochemical industry

The most economical & easy way to check RTJ, API Ring Grooves and all ring joint facings.

Unique Measuring Instrument for groove diameter measuring and groove pipe ring;

Designed specifically for oil field industry.

The series of API ring groove checker inspect all types of API Ring seal Groove i.e RTJ’s Groove. It is a modified form of vernier caliper, used for checking OD, ID and pitch diameter of the Ring joint facings.

Pitch diameter=(ID+OD)/2+20mm

During RTJ’s groove manufacturing, RTJ’s groove checking is an important criteria. Our RGC Caliper eliminate the headache of checking RTJ’s groove while machining. It saves rework & rejection cost of RTJ’s groove by giving direct accurate reading. 

The checking process of RTJ's groove with RGC calipers is simple, RGC is properly positioned on falt surface of RTJ's groove. The precision contact point of ball touches the angular portion of the groove. The RGC Caliper gives the reading. From this reading we can subtract/add some constant valve to obtain final drawing reading of RTJ's groove


1) Does not required any setting gauge or parameter.

2) Gives accurate reading in metric or inch; 

3) Measure all parameter of RTJ's groove(OD, ID, PCD)

4) Covers all types of RTJ's groove i.e. R, RX, BX

5) Gives 100% Repeatability.

6) No skills required.

7) Save rework or rejection headached.

8) Save time, save money

9) Easy to handle, easy to store, easy to use.

10) Coolant-proof, corrosion resistance.

Range(mm/in) Permissible Error Resolution Order No. Price Buy Now
0-300mm ±0.04mm 0.01mm 171-603 $130.00USD


Questions & Comments

  • Leon Bradshaw on June 7, 2016, 12:04 pm

    For BX type grooves where the OD and Id dimensions are required to specific angles, is there a formula to be carried out from direct reading of scale to give specific actual OD & ID dimensions? The photo shows cone type inserts, for BX grooves are t

  • kris winnington on May 29, 2015, 12:49 pm

    hi would you be able to supply a API ring groove caliper ring joint measuring instrument for a R71 ASME B16.5 specification groove?

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