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DIN 983:2021
Retaining rings with lugs for shafts (internal circlips)
This document applies to retaining rings with lugs for use on shafts. Such retaining rings are suitable for securing machine components which have non-square (radiused or chamfered) edges, and for concealed assembly. They have an eccentric form and several lugs of equal radial width uniformly distributed over their circumference.
Deutsches Institut für Normung [din]