SKF Deep Groove Ball Bearing, Double Sealed, Steel CageDeep-groove geometry for high speeds and supporting both radial and axial loads; Single-row bearing for supporting radial loads; C3 radial internal clearance Radial internal clearance SPC2 for clearance greater than C1; CN for Normal clearance, greater than SPC2; C3 for clearance greater than Normal. The values for radial internal clearance 
Internal clearance ISO clearance class, SKF designation suffix, Internal clearance. -, C1, Smaller than C2. Group 2, C2, Smaller than Normal. Group N, -, Normal. Group 3, C3Designation system P63, P6 + C3. CN, Normal radial internal clearance; only used together with an additional letter that identifies a reduced or displaced clearance rangeBearing data Normal, C3 Check availability of C2, C4 or C5 clearance classes. Bearings for vibratory applications: C4 Bearings for high-speed applications: C4Deep groove ball bearings - 6313 d, 65, mm. D, 140, mm. B, 33, mm. d1, ≈, 88.35, mm. D2, ≈, 121.3, mm. r1,2, min. 2.1, mm. Abutment dimensions. da, min. 77, mm. Da, max. 128, mm. ra, max