The Timken Company - Tapered Roller Bearings - TS (Tapered Single) Metric

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This is the most basic and most widely used type of tapered roller bearing. It consists of two main separable parts: the cone (inner ring) assembly and the cup (outer ring). It is typically mounted in opposing pairs on a shaft.

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Unit of Measure

Items	30302 Tapered Roller Bearings - TS (Tapered Single) Metric	30203 Tapered Roller Bearings - TS (Tapered Single) Metric	30303 Tapered Roller Bearings - TS (Tapered Single) Metric	30204 Tapered Roller Bearings - TS (Tapered Single) Metric	30304 Tapered Roller Bearings - TS (Tapered Single) Metric
Series	N/A 30302	N/A 30203	N/A 30303	N/A 30204M	N/A 30304
Cone Part Number	N/A X30302	N/A X30203	N/A X30303	N/A X30204M	N/A X30304
Cup Part Number	N/A Y30302	N/A Y30203	N/A Y30303	N/A Y30204M	N/A Y30304
d - Bore	N/A 15 mm0.5906 in	N/A 17 mm0.6693 in	N/A 17 mm0.6693 in	N/A 20 mm0.7874 in	N/A 20 mm0.7874 in
D - Cup Outer Diameter	N/A 42 mm1.6535 in	N/A 40 mm1.5748 in	N/A 47 mm1.8504 in	N/A 47 mm1.8504 in	N/A 52 mm2.0472 in
B - Cone Width	N/A 13.000 mm0.5118 in	N/A 12.000 mm0.4724 in	N/A 14.000 mm0.5512 in	N/A 14.000 mm0.5512 in	N/A 15.000 mm0.5906 in
C - Cup Width	N/A 11.000 mm0.4331 in	N/A 11.000 mm0.4331 in	N/A 12.000 mm0.4724 in	N/A 12.000 mm0.4724 in	N/A 13.000 mm0.5118 in
Design Unit	N/A Metric
T - Bearing Width	N/A 14.250 mm0.5610 in	N/A 13.250 mm0.5217 in	N/A 15.250 mm0.6004 in	N/A 15.250 mm0.6004 in	N/A 16.250 mm0.6398 in
R - Cone Backface "To Clear" Radius¹	N/A 1.020 mm0.040 in	N/A 1.020 mm0.040 in	N/A 1.020 mm0.040 in	N/A 1.020 mm0.040 in	N/A 1.520 mm0.06 in
r - Cup Backface "To Clear" Radius²	N/A 1.02 mm0.04 in	N/A 1.02 mm0.04 in	N/A 1.02 mm0.04 in	N/A 1.02 mm0.04 in	N/A 1.52 mm0.06 in
da - Cone Frontface Backing Diameter	N/A 19 mm0.75 in	N/A 21 mm0.83 in	N/A 21.5 mm0.85 in	N/A 26 mm1.02 in	N/A 24.5 mm0.96 in
db - Cone Backface Backing Diameter	N/A 20.5 mm0.81 in	N/A 22 mm0.87 in	N/A 22.5 mm0.89 in	N/A 27.5 mm1.08 in	N/A 27 mm1.06 in
Da - Cup Frontface Backing Diameter	N/A 39.12 mm1.54 in	N/A 37.59 mm1.48 in	N/A 43.43 mm1.71 in	N/A 43.94 mm1.73 in	N/A 48.01 mm1.89 in
Db - Cup Backface Backing Diameter	N/A 36.58 mm1.44 in	N/A 35.05 mm1.38 in	N/A 41.40 mm1.63 in	N/A 40.89 mm1.61 in	N/A 45.47 mm1.79 in
Ab - Cage-Cone Frontface Clearance	N/A 2.8 mm0.11 in	N/A 2 mm0.08 in	N/A 2.8 mm0.11 in	N/A 2.8 mm0.11 in	N/A 3.3 mm0.13 in
Aa - Cage-Cone Backface Clearance	N/A -0.8 mm-0.03 in	N/A -0.3 mm-0.01 in	N/A -0.8 mm-0.03 in	N/A -0.5 mm-0.02 in	N/A -1 mm-0.04 in
a - Effective Center Location³	N/A -4.6 mm-0.18 in	N/A -3.6 mm-0.14 in	N/A -4.8 mm-0.19 in	N/A -4.3 mm-0.17 in	N/A -4.8 mm-0.19 in
C90 - Dynamic Radial Rating (90 million revolutions)⁴	N/A 6750 N1520 lbf	N/A 5530 N1240 lbf	N/A 8480 N1910 lbf	N/A 8620 N1940 lbf	N/A 9980 N2240 lbf
C1 - Dynamic Radial Rating (1 million revolutions)⁵	N/A 26000 N5850 lbf	N/A 21300 N4800 lbf	N/A 32700 N7360 lbf	N/A 33200 N7470 lbf	N/A 38500 N8660 lbf
C0 - Static Radial Rating	N/A 22200 N4980 lbf	N/A 19900 N4460 lbf	N/A 28400 N6390 lbf	N/A 33000 N7420 lbf	N/A 34500 N7760 lbf
C_a90 - Dynamic Thrust Rating (90 million revolutions)⁶	N/A 3290 N740 lbf	N/A 3270 N735 lbf	N/A 4140 N931 lbf	N/A 5090 N1140 lbf	N/A 5130 N1150 lbf
K - Factor⁷	N/A 2.05	N/A 1.69	N/A 2.05	N/A 1.69	N/A 1.95
e - ISO Factor⁸	N/A 0.29	N/A 0.35	N/A 0.29	N/A 0.35	N/A 0.3
Y - ISO Factor⁹	N/A 2.11	N/A 1.74	N/A 2.11	N/A 1.74	N/A 2
G1 - Heat Generation Factor (Roller-Raceway)	N/A 4.3	N/A 4.2	N/A 5.8	N/A 7.1	N/A 7.5
G2 - Heat Generation Factor (Rib-Roller End)	N/A 4.6	N/A 6	N/A 5	N/A 7.3	N/A 5.5
Cg - Geometry Factor¹⁰	N/A 0.0375	N/A 0.0398	N/A 0.0412	N/A 0.0474	N/A 0.0458
Bearing Weight	N/A 0.10 Kg0.2 lb	N/A 0.10 Kg0.2 lb	N/A 0.10 Kg0.300 lb	N/A 0.10 Kg0.300 lb	N/A 0.2 Kg0.4 lb
Full Timken Part Number	N/A 30302-90KA1	N/A 30203	N/A 30303-90KA1	N/A 30204M-90KM1	N/A 30304-90KA1
¹ These maximum fillet radii will be cleared by the bearing corners. ² These maximum fillet radii will be cleared by the bearing corners. ³ Negative value indicates effective center inside cone backface. ⁴ Based on 90 x 10⁶ revolutions L₁₀ life, for The Timken Company life calculation method. C₉₀ and C_a90 are radial and thrust values. ⁵ Based on 1 x 10⁶ revolutions L₁₀ life, for the ISO life calculation method. ⁶ Based on 90 x 10⁶ revolutions L₁₀ life, for The Timken Company life calculation method. C₉₀ and C_a90 are radial and thrust values for a single-row, C₉₀₍₂₎ is the two-row radial value. ⁷ These factors apply for both inch and metric calculations. Consult your Timken representative for instruction on use. ⁸ These factors apply for both inch and metric calculations. Consult your Timken representative for instruction on use. ⁹ These factors apply for both inch and metric calculations. Consult your Timken representative for instruction on use. ¹⁰ Geometry constant for Lubrication Life Adjustment Factor a3l.