... 517, 537,547,617,63726660417,517, 537,547,617,6376.Bearing sealed: metal sealed (HJ), rubber sealed(HA), not ... Transportation: air or shipping9.Sealed bearing structure : Abrasion resistance and seizure resistance of the bearing are improved and suitable for ... high rotary speed. The advanced metal seal package will improve the reliability and durability of bearing seal. 118 single tooth drilling bits ...