Deep groove ball bearings good quality, favorable price ISO 9001:2008 certified each item separately packed into CMB box Material and Hardness of CMB Bearing Rings and Balls: The rings and balls of bearings are made of refined high carbon chrome bearing steel Gcr15(AISI52100).Bearing Tolerance can achieve: P0ABEC1,P6ABEC3Noise and Vibration: The noise and vibration of CMB bearings are classified as Z1,Z2,Z3 and Z4, Or classied as V1,V2,V3 and V4Open, Shield, Seal and Lubrations:Bearings are divided into various types such as open, with single or double shields(Z,ZZ) and with seals(RS/RZ, 2RS/2RZ)......

deep groove ball bearing