Description:
Companion Flange, sometimes referred to as a hub, 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.

Specifications:
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