Bearing units is made of insert bearings and various structural type casting housings (or stamping steel housings). Insert bearing is a kind of deep groove ball bearing with spherical outer ring and double sealing structure and some types have widened inner ring.
Material GCR-15,Chrome steel,Carbon steel
Seals Type rubber, steel
Precision Rating P0/P6/P5 
Clearance C0,C1,C2,C3,C4 
Tolerance ABEC-1,ABEC-3,ABEC-5 
Vibration: Z1V1,Z2V2,Z3V3 
Hardness 59-63 
Cage Steel,Brass,Nylon 
Quality Standard ISO9001:2000 system passed