![]() The use and effectiveness of spring lock washers have been in the 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. Where a flat washer is required to span a large hole in a component, a nyloc nut (nylon insert) must be used. 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 will resist turning. Therefore, spring washers are ineffective on left-hand threads and hardened surfaces. ![]() 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. ![]() ![]() Split lock washer is a left-hand helix and allows the thread to be tightened in a right-hand direction only, i.e. ![]()
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