KC Welding KC-6-R 6” Ratchet Pipe Clamp, A36 Steel, 3/4” Square-Head RatchetKC Welding KC 6 R is a heavy duty ratchet style pipe clamp designed for fit up and alignment on 6 nominal pipe. It uses an A36 carbon steel clamp body with a square head ratchet and screw assembly for secure, repeatable tightening in shop or field work. Specifications Brand: KC Welding MPN: KC 6 R Clamp size: 6 Clamp material: A36 carbon steel Screw assembly materials: Screw A311; Nuts C1018 Ratchet type: Square head, 3 4 Ratchet part #: KC RH 16 0.