Hign-concerned Chemical : None Surface Roughness : Ra 0.05 Torque Capacity : 3*10*4 MM Structure : ECCENTRIC Model Number : 623ZZ 3x10x4 mm Coatings : NICKEL Material : STEEL Brand Name : FUSHI Origin : Mainland China Certification : RoHS,None Miniature Bearing Features Miniature Bearings can sustain some axial load in either direction as well as radial loads, And the two raceway cross-sections are simple circular arcs which can be very precisely finished so the bearings have low friction and very little noise or vibration. Several different cage designs are available with different characteristics and the choice depends upon the individual application. TECHNICAL SPECS (metric): Model: 623-ZZ Inner (d): 3 mm Outer (D): 10 mm Width (B): 4 mm Weight (g): 1.53 g Grade: ABEC-5 Material: 52100 Chrome Steel Cover: 2 Shield Qty: 1 Lot = 10 Pcs This Bearing Structure Standard Type: A ball bearing is composed of an outer and inner ring, balls, seal and a retainer. Open type will no seal, Flanged type with flange side.