This part of GB/T 1149 specifies the classification, type, names, terms and definitions of piston rings for reciprocating piston internal combustion engines. This section applies to reciprocating piston internal combustion engine piston rings. Compressor piston rings working under similar conditions can also be used as a reference.
GB/T 1149.2-2010 Referenced Document
ISO 286-1 Geometrical product specifications (GPS) - ISO code system for tolerances on linear sizes - Part 1: Basis of tolerances, deviations and fits; Technical Corrigendum 1*, 2013-08-01 Update
GB/T 1149.2-2010 history
2013GB/T 1149.12-2013 Internal combustion engines.Piston rings.Part 12: Half keystone rings made of steel