【Material】 The hex nut is made of high-quality carbon steel and nylon, which is strong, wear-resistant, and durable. The self-locking nut is easy to use. 【Stability】 The hex nut has a thread inside, which can fix the nut to prevent loosening, and the fastening effect is good. 【Finish】 The surface is black electroplated, rust-proof, and beautiful. The machine tool is precisely manufactured by calculator control, with standard dimensions, clear and clean threads. 【Widely Used】Our self-locking nuts are very strong, suitable for machine building, automobiles, motorcycles, model making, fences, furniture, etc. Hex nut made of high-quality carbon steel and nylon. The internal thread is self-locking, easy to use, and the fastening effect is better. Hex nuts can be used in conjunction with bolts and screws to connect and fix parts. It is widely used in mechanical engineering, automobiles, motorcycles, model making, fences, furniture, etc. The safety nut, also called a stop nut or self-locking nut, is provided with a polyamide plastic clamping element in the internal thread. Thanks to plastic deformation of the plastic part that occurs when tightening the nut, the self-loosening of the screw connection is prevented and other machine elements. or the work of the screw rod is not necessary. Important: Lock nuts are disposable. If such a connection is resolved, the lock nut becomes unusable and must be replaced. Protection against self-loosening is no longer possible. Self-locking nuts with plastic ring are not suitable for high operating temperatures. Contents: 50 M5 hexagon nuts.