Split Lock Washer Flat Spring Washer Hardened Washers Metric DIN 127

Split lock washer is a left-hand helix and allows 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 will resist turning. 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 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. NASA researchers have gone as far as to say “In summary, a lock washer of this type is useless for locking.” 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. Ever Hardware provides custom-made fasteners and customizable packaging.

Heat treating makes the split lock washer high strength. Heat treating is a group of industrial and metalworking processes used to alter the physical, and sometimes chemical, properties of a material. The most common application is metallurgical.

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