This part of GB/T1149 stipulates the basic dimensional characteristics of wedge-shaped steel piston rings (hereinafter referred to as wedge-shaped steel rings) with piston ring models HK and HKB. This standard applies to wedge steel rings for reciprocating piston internal combustion engines with cylinder diameters from 38 mm to 160 mm.
GB/T 1149.12-2013 Referenced Document
ISO 6621-4 Internal combustion engines - Piston rings - Part 4: General specifications*, 2015-03-01 Update
GB/T 1149.12-2013 history
2013GB/T 1149.12-2013 Internal combustion engines.Piston rings.Part 12: Half keystone rings made of steel