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ISO 6624-4:2016
Internal combustion engines - Piston rings - Part 4: Half keystone rings made of steel
ISO 6624-4:2016 specifies the essential dimensional features of half keystone rings made of steel, types HK, HKB and HKBA, having nominal diameters from 50 mm up to, and including, 160 mm, used in reciprocating internal combustion piston engines for road vehicles and other applications.
International Organization for Standardization [iso]