Companion Flange

Size: 1-13/16″ – 26-3/4″

Working Pressure: 2000PSI, 3000PSI, 5000PSI, 10000PSI, 15000PSI, 20000 PSI

Standard Material: AISI 4130(forged) 75K/ 410 Stainless Steel

Face Type: RTJ, FF, RF

Connection: Bolted or Studded

Surface Treatment: Anti-Rust Oil, Transparent/Yellow/Black Anti-Rust Paint, Zinc, Hot Dipped Galvanized.

Temp Class: K-V

Material Class: BB, CC, DD, EE, FF

PSL Rating: PSL1, PSL2, PSL3

PR Rating: PR1, PR2


A Companion Flange is a flange that corresponds to another flange. It has bolt holes that align with another flange is a trait of this type of flange. Usually, a companion flange features a Raised Face (RF) or Ring Joint (RTJ), with a threaded outlet. Also called a Threaded Flange by some people.


  1. Designed and manufactured according to API 6A latest edition.
  2. All sizes and materials are available, including alloy steel, carbon steel, and stainless steel.
  3. 100% test for each piece including Hardness test, MT, NT, and hydrostatic test.  


Companion Flange

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