Applicated in engineering machine. Heavy Duty Supper Lubricating Bushing MaterialLow carbon alloy steelHTCarburizing and quenching, hardness 56-62HRC,carburizing depth 1.0to 1.6mmSTDouble friction reduce treatmentLubricating TypeOil pitsApplicationExcavator, rotary drilling machine, heavy duty loader, diaphragm wall grabFriction Factor<0.1Critical Using Temp350°CCritical Dynamic Load250N/mm² ...