... .03-0.2310 6radsSTRUCTURE1PTFE with lead 0.01-0.03mm2Porous bronze 0.2-0.3mm3Steel backing 0.7-2.3mm4Tin-plating ... course of movement. favorable protection forgrinding bearing no grip appearance.7.Less requirement for grinding bearing, all the bearings that not hardening ... , tobacco machine, micro-machine, automobile, motorcycle, agriculture machine. SF-1DU oilless lubricant bearing