It is a piece with a central hole, which has a thread, which is used to attach to a screw in a fixed or sliding way. Nut allows clamping and fixing of removable element joints, designed for use in high pressure and/or high temperature service, made of medium carbon steel, quenched and tempered, are approximately 10% wider and taller than standard hex nuts and distribute the load over a large area, have a load resistance of 120,000 psi.