The Timken Company - Tapered Roller Bearings - TNA (Tapered Double, non-adjustable) Imperial

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Unit of Measure

Items	NA05075 - 05185D Tapered Roller Bearings - TNA (Tapered Double, non-adjustable) Imperial	NA17098 - 17245D Tapered Roller Bearings - TNA (Tapered Double, non-adjustable) Imperial	NA41125 - 41294D Tapered Roller Bearings - TNA (Tapered Double, non-adjustable) Imperial	NA26118 - 26284D Tapered Roller Bearings - TNA (Tapered Double, non-adjustable) Imperial	NA08125 - 08231D Tapered Roller Bearings - TNA (Tapered Double, non-adjustable) Imperial
Cone Part Number	N/A NA05075	N/A NA17098	N/A NA41125	N/A NA26118	N/A NA08125
Cup Part Number	N/A 05185D	N/A 17245D	N/A 41294D	N/A 26284D	N/A 08231D
Design Unit	N/A Inch
d - Bore	N/A 3/4 in19.05 mm	N/A 0.9835 in24.981 mm	N/A 1 1/8 in28.575 mm	N/A 1.1806 in29.987 mm	N/A 1 1/4 in31.75 mm
D - Cup Outer Diameter	N/A 1.8504 in47 mm	N/A 2.4409 in61.999 mm	N/A 2-15/16 in74.613 mm	N/A 2.8336 in71.973 mm	N/A 2.3125 in58.738 mm
T - Bearing Width across Cones	N/A 1.25 in31.75 mm	N/A 1.5625 in39.688 mm	N/A 2.1876 in55.565 mm	N/A 1.6835 in42.76 mm	N/A 1.2812 in32.542 mm
R - Cone Backface "To Clear" Radius¹	N/A 0.050 in1.300 mm	N/A 0.06 in1.5 mm	N/A 0.09 in2.300 mm	N/A 0.06 in1.5 mm	N/A 0.06 in1.5 mm
r - Cup Backface "To Clear" Radius²	N/A 0.030 in0.8 mm	N/A 0.030 in0.8 mm	N/A 0.06 in1.5 mm	N/A 0.030 in0.8 mm	N/A 0.020 in0.40 mm
C - Double Cup Width	N/A 0.9926 in25.212 mm	N/A 1.4275 in36.259 mm	N/A 1.6250 in41.275 mm	N/A 1.4375 in36.513 mm	N/A 0.9688 in24.608 mm
db - Cone Backface Backing Diameter	N/A 0.98 in25 mm	N/A 1.30 in33.0 mm	N/A 1.69 in43 mm	N/A 1.5 in38 mm	N/A 1.52 in38.5 mm
Da - Cup Frontface Backing Diameter	N/A 1.69 in42.42 mm	N/A 2.26 in57.40 mm	N/A 2.72 in69.09 mm	N/A 2.60 in65.02 mm	N/A 2.20 in55.12 mm
Bearing Weight	N/A 0.51 lb0.23 Kg	N/A 1.36 lb0.62 Kg	N/A 2.45 lb1.12 Kg	N/A 1.87 lb0.84 Kg	N/A 0.790 lb0.35 Kg
C90 - Dynamic Radial Rating (90 million revolutions)³	N/A 1560 lbf6930 N	N/A 2520 lbf11200 N	N/A 4060 lbf15100 N	N/A 4060 lbf18100 N	N/A 1850 lbf8220 N
C1 - Dynamic Radial Rating (1 million revolutions)⁴	N/A 10500 lbf46500 N	N/A 16900 lbf75300 N	N/A 27300 lbf121000 N	N/A 23000 lbf102000 N	N/A 12400 lbf55200 N
C_a90 - Dynamic Thrust Rating (90 million revolutions)⁵	N/A 952 lbf4230 N	N/A 1650 lbf7340 N	N/A 4190 lbf18600 N	N/A 2500 lbf11100 N	N/A 1500 lbf6670 N
C90₍₂₎ - Dynamic Radial Rating (Two-Row, 90 million revolutions)⁶	N/A 2710 lbf12100 N	N/A 4390 lbf19500 N	N/A 7080 lbf31500 N	N/A 7070 lbf31400 N	N/A 3220 lbf14300 N
K - Factor⁷	N/A 1.64	N/A 1.53	N/A 0.97	N/A 1.62	N/A 1.23
e - ISO Factor⁸	N/A 0.36	N/A 0.38	N/A 0.6	N/A 0.36	N/A 0.47
Y1 - ISO Factor⁹	N/A 1.89	N/A 1.77	N/A 1.12	N/A 1.87	N/A 1.42
Y2 - ISO Factor¹⁰	N/A 2.82	N/A 2.63	N/A 1.67	N/A 2.79	N/A 2.12
Cg - Geometry Factor¹¹	N/A
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 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 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. 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 These factors apply for both inch and metric calculations. Consult your Timken representative for instruction on use. ¹¹ Geometry constant for Lubrication Life Adjustment Factor a3l.