The Timken Company - Tapered Roller Bearings - Single Cones - Imperial

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Items	A2031 Tapered Roller Bearings - Single Cones - Imperial	A2037 Tapered Roller Bearings - Single Cones - Imperial	A4044 Tapered Roller Bearings - Single Cones - Imperial	A2047 Tapered Roller Bearings - Single Cones - Imperial	A4049 Tapered Roller Bearings - Single Cones - Imperial
Series	N/A A2000	N/A A2000	N/A A4000	N/A A2000	N/A A4000
Cone Part Number	N/A A2031	N/A A2037	N/A A4044	N/A A2047	N/A A4049
Design Units	N/A Imperial
d - Cone Bore	N/A 0.3125 in7.938 mm	N/A 0.3750 in9.525 mm	N/A 0.4375 in11.113 mm	N/A 0.4719 in11.986 mm	N/A 0.4992 in12.680 mm
B - Cone Width	N/A 0.4246 in10.785 mm	N/A 0.4246 in10.785 mm	N/A 0.4326 in10.988 mm	N/A 0.4246 in10.785 mm	N/A 0.4326 in10.988 mm
R - Cone Backface "To Clear" Radius¹	N/A 0.02 in0.50 mm	N/A 0.050 in1.300 mm	N/A 0.050 in1.300 mm	N/A 0.03 in0.800 mm	N/A 0.03 in0.800 mm
da - Cone Frontface Backing Diameter	N/A 0.49 in12.5 mm	N/A 0.53 in13.5 mm	N/A 0.61 in15.5 mm	N/A 0.61 in15.5 mm	N/A 0.69 in17.5 mm
db - Cone Backface Backing Diameter	N/A 0.51 in13 mm	N/A 0.59 in15 mm	N/A 0.69 in17.5 mm	N/A 0.65 in16.5 mm	N/A 0.69 in17.5 mm
Ab - Cage-Cone Frontface Clearance	N/A 0.09 in2.3 mm	N/A 0.09 in2.3 mm	N/A 0.07 in1.8 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 in0 mm	N/A -0.03 in-0.8 mm	N/A 0 in0 mm
a - Effective Center Location²	N/A -0.12 in-3 mm	N/A -0.12 in-3 mm	N/A -0.1 in-2.5 mm	N/A -0.12 in-3 mm	N/A -0.1 in-2.5 mm
Cage Type	N/A Stamped Steel
C90 - Dynamic Radial Rating (90 million revolutions)³	N/A 630 lbf2800 N	N/A 630 lbf2800 N	N/A 767 lbf3410 N	N/A 630 lbf2800 N	N/A 767 lbf3410 N
C1 - Dynamic Radial Rating (1 million revolutions)⁴	N/A 2430 lbf10800 N	N/A 2430 lbf10800 N	N/A 2960 lbf13200 N	N/A 2430 lbf10800 N	N/A 2960 lbf13200 N
C1 - Dynamic Radial Rating (Two-Row, 1 million revolutions)⁵	N/A 4230 lbf18800 N	N/A 4230 lbf18800 N	N/A 5150 lbf22900 N	N/A 4230 lbf18800 N	N/A 5150 lbf22900 N
C0 - Static Radial Rating	N/A 2070 lbf9230 N	N/A 2070 lbf9230 N	N/A 2580 lbf11500 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 594 lbf2640 N	N/A 437 lbf1940 N	N/A 594 lbf2640 N
C90(2) - Dynamic Radial Rating (Two-Row, 90 million revolutions)⁷	N/A 1100 lbf4880 N	N/A 1100 lbf4880 N	N/A 1330 lbf5940 N	N/A 1100 lbf4880 N	N/A 1330 lbf5940 N
K - Factor⁸	N/A 1.44	N/A 1.44	N/A 1.29	N/A 1.44	N/A 1.29
G1 - Heat Generation Factor (Roller-Raceway)	N/A 1.7	N/A 1.7	N/A 2.3	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 4.12	N/A 3.2	N/A 4.12
Cg - Geometry Factor⁹	N/A 0.0308	N/A 0.0308	N/A 0.0355	N/A 0.0308	N/A 0.0355
¹ These maximum fillet radii will be cleared by the bearing corners. ² Negative value indicates effective center inside cone backface. ³ Based on 90 x 10⁶ revolutions L₁₀ life, for The Timken Company life calculation method. C₉₀ and C_a90 are radial and thrust values. ⁴ Based on 1 x 10⁶ revolutions L₁₀ life, for the ISO life calculation method. 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 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. ⁸ These factors apply for both inch and metric calculations. Consult your Timken representative for instruction on use. ⁹ Geometry constant for Lubrication Life Adjustment Factor a3l.