Stainless steel or mild steel made hex nuts are used for fixing of hexagonal screws or bolts by using a wrench. Developed as per DIN norms, these nuts are used as suitable fixing accessories for CNC systems, surface grinder system and heading machine. Hardening or stress reliving manufacturing method of these nuts makes these highly durable, strong and tough. Based on application type, hex nuts are offered with anodized/passivated/zinc plated/plain or any other surface finish based choices. Quality of these metal fastening accessories has been verified by using hardness tester, thickness gauge etc.