Internal combustion engines. Piston rings - General specifications1 Scope This part of ISO 6621 specifies the general characteristics of piston rings for reciprocating internal combustion engines for road vehicles and other applications (the individual dimensional criteria for these rings are given in the relevant International Standards). It also provides a system for ring coding, designation, and marking. It is applicable to all such rings of a nominal diameter from 30 mm up to and including 200 mm.

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It specifies a formal generic structure independent of the publishing media and it proposes means of presenting entries in print and electronic dictionaries

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