***RPM Limit Grease 18000 rpm ***Dimension D (Outside) 40 mm d (Inside) Bore 17 mm B (Width) 12 mm ***Deep Groove Ball Bearing ISO 9001:2002 ***ABEC Tolerance Codes ABEC3/C3 ***Vibration Level V2+ ***Shield/Closure codes 2RS (Two Side Rubber Seal) ***Lubrication: Grease (Wide Temperature Range: - 20 C to 120 C ) JSB Great Bearings