grey iron piston ring (gray iron piston ring)
1.Material: grey iron class 30/40 (alloy grey iron)
2. Size range of OD at 0.75"-12.5" (20-320mm)
3.Joint: Interlock, Step cut, Butt cut, Hook, Angel butt cut etc.
4.Coatings: manganese phosphate, chrome, nikel ...
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