This part of GB/T 1149 specifies the basic dimensional characteristics of wedge-shaped cast iron piston rings with piston ring types HK and HKB. This standard applies to wedge-shaped cast iron rings for reciprocating piston internal combustion engines with cylinder diameters from 38 mm to 160 mm.
GB/T 1149.11-2010 Internal combustion engines.Piston rings.Part 11:Half keystone rings made of cast iron has been changed from GB/T 14223-1993 Internal combustion engines--Piston rings--Keystone rings and half keystone rings.