The Durlok System comprises specially designed bolts and nuts with radial serrations on the flange surface that engage both the fastener and the bearing material. This design produces moderate but sufficient edge pressure to guarantee self-locking without damaging or grooving the clamped material. Durlok fasteners are reusable, as their serration pattern maintains locking ability even after multiple assemblies. The system works effectively on a broad range of materials including hardened steels, cast irons, non-ferrous metals, and sheet materials. Designed for high tensile strength and vibration resistance, Durlok fasteners deliver enhanced safety, reduced maintenance, and improved performance in critical engineering applications.