Uxcell M20 Carbon Steel Flat Washer 21x36.5x2.8mm Black Oxidized Grade 8.8 Alloy Steel Fasteners 10 Pack

Made of black oxidized carbon steel which has the characteristics of good cutting performance high hardness good toughness and wear resistance after quenching and tempering treatment. The flat washer is commonly used to distribute loads of threaded bolts screws and nuts evenly as the fastener is tightened. Intended for general use under the head of a bolt or nut across the area of the support in order to provide a smooth surface and prevent pull through. Widely used in mechanical industry automotive home decoration electrical maintenance furniture repair shop and outdoor construction and threaded bolt connections.