... Nitrided etc. 3.ISO9002,QS9000,TS16949 Piston Ringpiston ring for Komatsu 6D105 engine:1.piston ring material :nodular iron, cast ... phosphating, etc(we can aslo do as per customer's request)3.piston ring characteristics:1)wear-resistant2)high ... 6D95, SA1D95,6D102, S6D102, S6D105, 6D108, S6D108, S6D110, 4D120, 6D125, 4D130, 6D140, 6D155, S6D155, S6D170Volvo piston ringTD100A, TD100B, TD120G, ...