32303 Bearings
32303 Bearings
30203 Bearings
30203 Bearings

30303 Bearings

30303 Bearings
30303 Bearings

30303 Single row tapered roller bearing, inch size

Technical Specification of 30303 Bearings

Dimensions of 30303 Bearings

17 mm
Bore diameter
47 mm
Outside diameter
15.25 mm
Total width
30.55 mm
Shoulder diameter of inner ring
14 mm
Width of inner ring
12 mm
Width of outer ring
min.1 mm
Chamfer dimension of inner ring
min.1 mm
Chamfer dimension of outer ring
10.15 mm
Distance side face to pressure point

Abutment Dimensions of 30303 Bearings

max.25 mm
Diameter of shaft abutment
min.23.5 mm
Diameter of shaft abutment
min.40 mm
Diameter of housing abutment
max.41.5 mm
Diameter of housing abutment
min.42 mm
Diameter of housing abutment
min.2 mm
Minimum width of space required in housing on large side face
min.3 mm
Minimum width of space required in housing on small side face
max.1 mm
Radius of shaft fillet
max.1 mm
Radius of housing fillet


Caliculation Data of 30303 Bearings

Basic dynamic load ratingC
34.2 kN
Basic static load ratingC0
25 kN
Fatigue load limitPu
2.7 kN
Reference speed 
13 000 r/min
Limiting speed 
16 000 r/min
Limiting valuee
Calculation factorY
Calculation factorY0

Mass of 30303 Bearings

0.13 lb

Product Features of 30303 Bearings

  • Single row tapered roller bearings, inch sizes, designed to accommodate combined radial and axial loads and provide low friction in operation. The inner ring, including the rollers and cage, can be mounted separately from the outer ring.

  • These detachable and interchangeable parts facilitate installation, removal and maintenance. Rigid applications of bearings are achieved by mounting one single row tapered roller bearing on top of another and applying preload.

  • High radial and axial load carrying capacity

  • Accommodates axial loads in one direction

  • low friction and long service life

  • Separable and Interchangeable Components

Applications of 30303 Bearings

  • Double row/single row tapered roller bearings are mainly used in gearboxes, lifting equipment, steel rolling mills and for mining machinery, such as pit boring machines.

  • In the front wheel hub of the car, the small size of double row tapered roller bearings are used

  • Four-row tapered roller bearings four-row tapered roller bearings used in large cold, hot rolling mills and other heavy machinery. Mainly used in heavy machinery.

Applications of W 618/0.6 Bearings
Applications of Bearings
Wind Turbines
Applications of Bearings
Steel Industry
Applications of Bearings
Applications of Bearings
Food Processing Machinery
Applications of Bearings
Applications of Bearings
Mining & Construction
Applications of Bearings
Electric motors and generators

Product classification of Tapered roller bearings


  • Ball bearings are ideal for high-speed rotation, while roller bearings are more suited for high loads.
  • Because cylindrical roller bearings have separable inner and outer rings, they generally do not come with seals (open specification). As such, please apply seals or other protection around the equipment mounting.
  • EW Series bearings are small and utilize a pressed cage, making them suitable for standard operating conditions. ET Series bearings use a polyamide-resin cage suited for high temperatures. Finally, EM Series bearings have machined cages for use in harsh conditions such as gearboxes or vibrating machinery or in applications where the bearing must be quiet, such as in mid-to-large size motors.

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