Classification Of Gaskets

Washers are divided into: flat washer-C, large washer-A and C, extra-large washer-C, small washer-A, flat washer-A, flat washer-chamfered washer-A, high-strength washer for steel structure, spherical washer, conical washer, square bevel washer for I-beam, square bevel washer for channel steel, standard spring washer, light spring washer, heavy spring washer, internal serrated lock washer, internal serrated lock washer, external serrated lock washer, external serrated lock washer Single lug tab washer, double lug tab washer, outer tab tab washer, and tab washer for round nut.
Flat washers are generally used in connectors, one is soft and the other is hard and brittle. Its main function is to increase the contact area, disperse the pressure and prevent the soft from being crushed. The basic function of the spring of the spring washer is to give the nut a force after the nut is tightened to increase the friction between the nut and the bolt! The material is 65Mn (spring steel), the heat treatment hardness is HRC44 ～ 51HRC, and the surface is oxidized.
Huasi (spring) washer, the snap spring is an elastic cushion or a lock washer, which prevents the bolt from loosening. The working principle of the lock washer is very simple. It consists of two washers. The outer side has a radial convex surface, while the inner side has a helical tooth surface. When assembling, the inner helical tooth surfaces are opposite, and the outer radial convex surface is in an occlusive state with the contact surfaces at both ends. When the connecting piece is subject to vibration and the bolts tend to loosen, only the relative dislocation between the inner helical tooth surfaces of the two washers is allowed to generate lifting tension, so as to achieve 100% locking.
Spring washers are widely used in load-bearing and non-load-bearing structures of general mechanical products. They are characterized by low cost, convenient installation, and are suitable for parts with frequent assembly and disassembly. The automatic selection of washer is included, but the anti-loosening ability of spring washer is very low! Especially in Europe and the United States, the adoption rate of products requiring high reliability is very low, especially the important load-bearing structure connection parts have been abandoned. Our country still has some applications in military industry, but it has been improved to stainless steel. Steel spring washers have long been banned in CASC! In other words, it is very unsafe, because there are two reasons: 1 is "rising circle" and 2 is hydrogen embrittlement.