Brand Koyo (JTEKT) Item Number 6307ZZ C3 Koyo (JTEKT) Category Deep Groove Ball Bearings Single Row Weight and Dimensions Inner (d) MM 35 Outer (D) MM 80 Width (B) MM 21 Inner (d) Inch 1.378 Outer (D) Inch 3.1496 Width (B) Inch 0.8268 Weight (kg) 0.464 Product Properties Bore C - Cylindrical Bore Seal ZZ/2Z - Steel Seal on Two Sides Cage Type S - Steel or Standard Cage External Modification No External Modification Radial Internal Play C3 Internal Play (Higher than Cn) Precision Standard Precision Lubrication Standard Lubrication Heat Stabilization No Heat Stabilization - Temperatures up to 120 °C Special Treatment No Special Treatment Suffix description ZZ Two Shields C3 Internal Clearance Larger Than Normal