NSK Tapered Roller Bearings, Single-Row Metric Design HR30311J ,D=55

NSK Tapered Roller Bearings, Single-Row Metric Design HR30311J ,D=55   Bearing Numbers Boundary Dimensions (mm) Basic Load Ratings (kN) Limiting Speeds (min-1) ISO355 Dimensions Series approx. Constant e Axial Load Factors Mass (kg) approx. d D T B C Cone r min. Cup r min. Cr C0r Grease Oil Y1 Y0 HR30311J 55 120 31.5 29 25 2.5 2 150 171 3200 4300 2FB 0.35 1.7 0.96 1.63   DESIGN, TYPES, AND FEATURES Tapered roller bearings are designed so the apices of the cones formed by the raceways of the inner and outer rings and the inner ring rollers all coincide at one point on the axis of the bearing. When a radial load is imposed, a component axial force occurs; therefore, it is necessary to use two bearings in opposition or some other multiple-bearing arrangement. For Metric Series medium-angle or steep-angle tapered roller bearings, the respective contact angle designation C or D is added after the bore number. For normal-angle tapered roller bearings, no contact angle desig