... Nitrided etc. 3.ISO9002,QS9000,TS16949 Piston Ringpiston ring for Isuzu 4JB1:1.piston ring material :nodular iron, cast iron, steel, alloy ... 4BG1, 6HE1, 6HE1, 4HE1, 4HF1, 12PA1, 4HG1, 4JH1, 10PC1, DH100,6SD1, 6SD1-T, 6QA1, 6RB1, E120, 6RB1-T, 6RB1-TCMitsubishi piston ring4G42 ... , 4G32, 4G62, 4G67, 4G64, 4D55T, 4D55, 4RD5, S4E, 6SD1, 4M40, 6DS7, 6DS5, 4D30, 4D31T, 6D31T, 6D31, S6KT, 4D34T, ...