Historical
BS ISO 6621-4:2015
Internal combustion engines. Piston rings. General specifications (British Standard)
ISO 6621-4:2015 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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British Standards Institution [bsi]
British Standards Institution [bsi]