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

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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	A2031 - A2126 Tapered Roller Bearings - TS (Tapered Single) Imperial	A2031 - A2127 Tapered Roller Bearings - TS (Tapered Single) Imperial	A2037 - A2126 Tapered Roller Bearings - TS (Tapered Single) Imperial	A2037 - A2127 Tapered Roller Bearings - TS (Tapered Single) Imperial	A4044 - A4138 Tapered Roller Bearings - TS (Tapered Single) Imperial
Series	N/A A2000	N/A A2000	N/A A2000	N/A A2000	N/A A4000
Cone Part Number	N/A A2031	N/A A2031	N/A A2037	N/A A2037	N/A A4044
Cup Part Number	N/A A2126	N/A A2127	N/A A2126	N/A A2127	N/A A4138
d - Bore	N/A 0.3125 in7.938 mm	N/A 0.3125 in7.938 mm	N/A 0.3750 in9.525 mm	N/A 0.3750 in9.525 mm	N/A 0.4375 in11.113 mm
D - Cup Outer Diameter	N/A 1.2595 in31.991 mm	N/A 1.2595 in31.991 mm	N/A 1.2595 in31.991 mm	N/A 1.2595 in31.991 mm	N/A 1.3775 in34.989 mm
B - Cone Width	N/A 0.4246 in10.785 mm	N/A 0.4246 in10.785 mm	N/A 0.4246 in10.785 mm	N/A 0.4246 in10.785 mm	N/A 0.4326 in10.988 mm
C - Cup Width	N/A 0.3125 in7.938 mm	N/A 0.3755 in9.538 mm	N/A 0.3125 in7.938 mm	N/A 0.3755 in9.538 mm	N/A 0.3437 in8.730 mm
Design Unit	N/A Inch
T - Bearing Width	N/A 0.3940 in10.008 mm	N/A 0.4161 in10.569 mm	N/A 0.3940 in10.008 mm	N/A 0.4161 in10.569 mm	N/A 0.4330 in10.998 mm
R - Cone Backface "To Clear" Radius¹	N/A 0.02 in0.50 mm	N/A 0.02 in0.50 mm	N/A 0.050 in1.300 mm	N/A 0.050 in1.300 mm	N/A 0.050 in1.300 mm
r - Cup Backface "To Clear" Radius²	N/A 0.050 in1.27 mm
da - Cone Frontface Backing Diameter	N/A 0.49 in12.5 mm	N/A 0.49 in12.5 mm	N/A 0.53 in13.5 mm	N/A 0.53 in13.5 mm	N/A 0.61 in15.5 mm
db - Cone Backface Backing Diameter	N/A 0.51 in13 mm	N/A 0.51 in13 mm	N/A 0.59 in15 mm	N/A 0.59 in15 mm	N/A 0.69 in17.5 mm
Da - Cup Frontface Backing Diameter	N/A 1.18 in30.00 mm	N/A 1.14 in28.96 mm	N/A 1.18 in30.00 mm	N/A 1.14 in28.96 mm	N/A 1.28 in32.51 mm
Db - Cup Backface Backing Diameter	N/A 1.02 in25.91 mm	N/A 1.02 in25.91 mm	N/A 1.02 in25.91 mm	N/A 1.02 in25.91 mm	N/A 1.14 in28.96 mm
Ab - Cage-Cone Frontface Clearance	N/A 0.09 in2.3 mm	N/A 0.09 in2.3 mm	N/A 0.09 in2.3 mm	N/A 0.09 in2.3 mm	N/A 0.07 in1.8 mm
Aa - Cage-Cone Backface Clearance	N/A -0.03 in-0.8 mm	N/A -0.03 in-0.8 mm	N/A -0.03 in-0.8 mm	N/A -0.03 in-0.8 mm	N/A 0 in0 mm
a - Effective Center Location³	N/A -0.12 in-3 mm	N/A -0.12 in-3 mm	N/A -0.12 in-3 mm	N/A -0.12 in-3 mm	N/A -0.1 in-2.5 mm
C90 - Dynamic Radial Rating (90 million revolutions)⁴	N/A 630 lbf2800 N	N/A 630 lbf2800 N	N/A 630 lbf2800 N	N/A 630 lbf2800 N	N/A 767 lbf3410 N
C1 - Dynamic Radial Rating (1 million revolutions)⁵	N/A 2430 lbf10800 N	N/A 2430 lbf10800 N	N/A 2430 lbf10800 N	N/A 2430 lbf10800 N	N/A 2960 lbf13200 N
C0 - Static Radial Rating	N/A 2070 lbf9230 N	N/A 2070 lbf9230 N	N/A 2070 lbf9230 N	N/A 2070 lbf9230 N	N/A 2580 lbf11500 N
C_a90 - Dynamic Thrust Rating (90 million revolutions)⁶	N/A 437 lbf1940 N	N/A 437 lbf1940 N	N/A 437 lbf1940 N	N/A 437 lbf1940 N	N/A 594 lbf2640 N
K - Factor⁷	N/A 1.44	N/A 1.44	N/A 1.44	N/A 1.44	N/A 1.29
e - ISO Factor⁸	N/A 0.41	N/A 0.41	N/A 0.41	N/A 0.41	N/A 0.45
Y - ISO Factor⁹	N/A 1.48	N/A 1.48	N/A 1.48	N/A 1.48	N/A 1.32
G1 - Heat Generation Factor (Roller-Raceway)	N/A 1.7	N/A 1.7	N/A 1.7	N/A 1.7	N/A 2.3
G2 - Heat Generation Factor (Rib-Roller End)	N/A 3.2	N/A 3.2	N/A 3.2	N/A 3.2	N/A 4.12
Cg - Geometry Factor¹⁰	N/A 0.0308	N/A 0.0308	N/A 0.0308	N/A 0.0308	N/A 0.0355
Bearing Weight	N/A 0.1 lb0.000 Kg	N/A 0.1 lb0.000 Kg	N/A 0.1 lb0.000 Kg	N/A 0.1 lb0.000 Kg	N/A 0.1 lb0.10 Kg
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.