ring type joint klinger

A number of ring joint styles are available designed for specific flange types:

  • NB1 1/2” to 24” Class Rating 720 to 5000 ASME B16.20
  • NB26” to 36” Class Rating 300 to 900 ASME B16.20 Series A
  • NB1 1/2” to 20” Class Rating API 6A


  • Used for high pressure applications.
  • The Style RX is designed to fit the same groove design as a standard style R making joints interchangeable.
  • The Style RX has an increased height and utilizes the internal system pressure to energize and improve the seal as internal pressure increase.
  • Suitable for flat bottom groove flanges.

      Also available in style SRX.

Common Materials

Material Brinell Hardness Temperature limitations Identification
Soft iron 90 -60 to +400⁰C    D
Low carbon steel 120 -40 to +500⁰C   S
4%-6% Cr 1/2% Mo: F5 130 -125 to +500⁰C   F5
Stainless steel 304 /304L 160 -250 to +650⁰C   S304 or 304L
Stainless steel 316 /316L 160 -196 to +800⁰C    S316 or 316L
Stainless steel 321 160 -250 to +870⁰C    S321
Stainless steel 347 160 -250 to +870⁰C   S347
Stainless steel 410 170 -20 to +500⁰C    D9S410
Inconel 625 – 1000⁰C    625
Incoloy 825 – 1000⁰C    825
Hastelloy C-276 – 1000⁰C    C-276
Duplex – 800⁰C    S31803
Titanium – 540⁰C    TI

The sealing surfaces on the ring joint grooves must be smoothly finished to 63 Microinches and be free of objectionable ridges, tool or chatter marks.