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This type of washer is especially effective as a lock washer when used with a soft substrate, such as aluminium or plastic, [8] and can resist rotation more than a plain washer on hard surfaces, as the tension between washer and the surface is applied over a much smaller area (the teeth). There are four types: internal, external, combination ...
Toothed lock washers: Withdrawn: DIN 6798: Serrated lock washers: Withdrawn: DIN 6799: Lock washers (retaining washers) for shafts: Active: DIN 6880: Bright Key Steel; Dimensions, Permissible Variations, Weights: Active: DIN 6885-1: Drive Type Fastenings without Taper Action – Part 1: Parallel Keys, Keyways, Deep Pattern: Active: DIN 6885-2
A lock washer (of any type) bearing directly onto a soft surface is quickly made pointless by the soft material's creep or deformation under pressure. In this case, if a tooth washer is used against plastic, the tooth washer quickly becomes embedded in the plastic and any preload required to provide the locking (against the screw head) is gone.
This is done by either bolting the shafts together or by applying spring pressure from an external housing. This lack of backlash also reduces wear due to fretting. The coupling is defined by the groove count, the outer diameter of the cylindrical feature, the bottom angle of the grooves (to the axis of the cylindrical feature), and their depth.
In applications where vibration or rotation may work a nut loose, various locking mechanisms may be employed: lock washers, jam nuts, eccentric double nuts, [1] specialist adhesive thread-locking fluid such as Loctite, safety pins or lockwire in conjunction with castellated nuts, nylon inserts , or slightly oval-shaped threads.
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