A split washer or a spring washer is a ring split at one point and bent into a helical shape. This causes the washer to exert a spring force between the fastener’s head and the substrate, which maintains the washer hard against the substrate and the bolt thread hard against the nut or substrate thread, creating more friction and resistance to rotation. Applicable standards are ASME B18.21.1, DIN 127B, and United States Military Standard NASM 35338 (formerly MS 35338 and AN-935). Spring washers are a left hand helix and allow the thread to be tightened in a right hand direction only, i.e. a clockwise direction. When a left hand turning motion is applied, the raised edge bites into the underside of the bolt or nut and the part that it is bolted to, thus resisting turning. Therefore spring washers are ineffective on left hand threads and hardened surfaces. Also, they are not to be used in conjunction with a flat washer under the spring washer, as this isolates the spring washer from biting into the component that it is fastening. Where a flat washer is required to span a large hole in a component, a nyloc nut (nylon insert) must be used. The use and effectiveness of spring lock washers has been in debate of late, with some publications advising against their use on the grounds that, when tight, the washer is flat against the substrate and gives no more resistance to rotation than a normal washer at the same torque. Sources in reference are IS:3063, and NASA Fastener Design Manual. However, a spring washer will continue to hold the bolt against the substrate and maintain friction when loosened slightly, whereas a plain washer will not.
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M-sing Screw Factory with a mature production technology and sophisticated processing techniques, improved detection methods, with the development of strong design capabilities, product quality, the introduction of domestic and international high-precision molds and high-quality raw materials. The main production line with GB, Japan’s JIS, the United States ANSI, the German DIN, BS British standards of bolts, and customers can request all kinds of difficult design and production of standard parts. And through third-party authoritative testing agencies product testing, qualified in the relevant report. Re-header equipment, Roll Machine, tail-cutting, stamping machines, slot milling machines, line cutting, automatic lathes, and other production equipment, some of which more machinery assembling a computer-controlled, automatic detection display, can provide the steady and rapid Zero tolerance of the product, the monthly production capacity of several 10 million.
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