reidsupply.com sells good quality clamp. This supplier stocks bar, pipe and L camps of different designs. It has regular duty, heavy duty and extra heavy duty types clamps in its inventory. It also sells 36″ Heavy Duty steel clamp and the Clutch Style Bar Clamp. These clamps are made using high carbon steel or hardened steel.
Companies approach them for parts and products because it offers design diagrams too for a number of products.