In some instances, e.g. when being used as a torque limiter it is useful to deliberately design for the plastic zone so that large variations in component size will have minimal effect on the torque at which slip occurs. The ring is designed such that the crests of the waves embed slightly into the mating component and the base of the waves acts as a bearing surface and slips against the mating surface. Rings can be designed to slip either on the shaft or the bore, depending on materials, surface finish and hardness issues etc.
Rings coated with a proprietary dry lubricant have been developed to provide further enhanced performance and to eliminate the need for a greasing station on assembly lines.
Similar in principle to torque slip design these parts are designed to ensure that minimum torque is maintained across component tolerances and operating temperature range.
In applications with cyclical loading, e.g. mounting a belt pulley to a shaft, safety factors must be considered. For normal applications we recommend a safety factor of 3 be introduced to calculations, or in extreme cases, e.g. rapid reversal of direction or frequent stop-start, a factor of 6.