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RTJ API Ring Groove measuring Digital Caliper JOINT flange valve seal instrument


  • RTJ (ring type joint facing) API Ring Groove Digital Calipers, RING JOINT GROOVE measuring instruments, RTJ ring groove measuring instruments, rjt vernier caliper

  • This special caliper is used to measure the ring groove or ring joint in valve flange and pipe flange.

  • Denotes API critical dimension, break sharp corner typical, groove dimensions for type "R" and "RX" gaskets, size API 6A, API 3-5m ANSI.

  • With presetting function, so it is easy for origin-setting.

  • Can measure the outside and inside diameter of the RTJ and API (Ring Type Joint) ring groove. So you can calculate the pitch diamter by below formula: Preset 20mm before measuring, PCD means pitch circle diameter, PCD=(ID+OD)/2 ; Also this caliper can easy measure actually ID and OD for ring joint. Actually OD=reading+10mm, Actually ID=reading-10mm;

  • Available with conical and accurate cutting points.

  • The angle of the jaws/claw:23°  23 degree angle,

  • octagonal gasket and block ring sealing structure,oval type ring joint gaskets.

  • For ASME / ANSI B16.5

Range(mm/in) Resolution Permissible Error Order No. Price Buy Now
10-300mm 0.01mm ±0.03mm 426-403 $150.00USD
10-500mm 0.01mm ±0.05mm 426-405 $260.00USD
10-1000mm 0.01mm ±0.06mm 426-410 $420.00USD
10-600mm 0.01mm ±0.05mm 426-406 $320.00USD


RTJ API Ring Groove Digital Calipers

Questions & Comments

  • Glenn Salzer on April 20, 2021, 11:35 pm

    Hi I purchased the 426-405 set but it has no battery. What battery does it take. Thank-you

  • Fredy Barriga on June 14, 2019, 10:54 pm

    I am interested in your equipment, Please we are interested in your equipment to measure Ring groove, with equipment of 12 "and 24" range.

  • EDSON PALOMINO on March 21, 2019, 10:30 pm

    Good day We would like to buy it. Is it available in stock? Please your comments

  • Aryanto on November 15, 2017, 7:52 am

    Please advise price and delivery for range from 10 - 500 mm

  • Joni Sitio on July 25, 2017, 6:24 am

    Hi, I am looking for RTJ digital caliper, but I need the angle of jaws 20degree instead of 23 degree. Please have a look with this quaries if the equipment available I will order immediately.

  • Linda on March 7, 2017, 3:44 am

    Where is the best price?

  • wayne on March 1, 2017, 10:27 am

    price and delivery on order 118-401

  • Rezali kusnan on January 13, 2017, 7:14 am

    HI We are looking for RTJ grove vernier for measuring ASME B 16.5 RTJ flanges from 0 ~ 300 . Can I get Quotation form your with best price ASAP.Thanks

  • Rezali kusnan on January 13, 2017, 7:13 am

    HI We are looking for RTJ grove vernier for measuring ASME B 16.5 RTJ flanges from 0 ~ 300 . Can I get Quotation form your with best price ASAP.Thanks

  • Baskaran on June 16, 2016, 1:21 pm

    We need API ring groove vernier 0-500 mm. our factory is located at Oman. Please send us the brochure and Quotation.Also give us con tact details for any dealer in Dubai for your products.

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Product Detail

Ring groove measuring instruments, ring groove vernier caliper

We searched Ring Groove Measuring.

We are using the Caliper to measure RTJ Test Flanges 

For ASME / ANSI B16.5

This for our own workshop use. We use for measuring Ring grooves on API 6A Flanges, Blocks & Adapters etc.,
We are currently using Gage maker & Tool Runner Ball verniers, but we also want some direct reading verniers like yours for direct use by our machinists

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