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Turning Machining Part Tool Steel Hydraulic Plunger Pin Ultra Ground Precision Piston Pin for Auto Spare Part. Tool steel hydraulic plunger, turned and ultra ground. Honed surface gives smooth hydraulic action. Center hole aids grinding center. Chamfered ends ease installation. Mirror tolerance controls valve lash. Every unit is 100 percent inspected with factory inspection report. Quality Control: Includes 100% inspection with visual and functional testing for all parts. DFM Support: Engineering team provides Design for Manufacturability recommendations.