... 5 Belt conveyor roller application:Coal mining industry ,cement harbor, crushing and screening industry etc StandardDIN15207, DIN22107, ISO1537, GB10595CertificateISO, CEType conveyorDTII, TD75,DTII ... steel to required bearing toleranceBearingrow deep groove ball bearing 2Z and 2RS with C3 clearance.Rubberheat vulcanized rubber. Wear resistant, anti ...