The Timken Company - Tapered Roller Bearings - 2TS-DM (Matched Bearing Assembly, Direct Mount)

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Unit of Measure

Items	11590 - 11520 (Y2S-11520) Tapered Roller Bearings - 2TS-DM (Matched Bearing Assembly, Direct Mount)	12580 - 12520 (Y1S-12520) Tapered Roller Bearings - 2TS-DM (Matched Bearing Assembly, Direct Mount)	LM48548 - LM48510 (LM48510EE) Tapered Roller Bearings - 2TS-DM (Matched Bearing Assembly, Direct Mount)	HM88649 - HM88610 (HM88610EA) Tapered Roller Bearings - 2TS-DM (Matched Bearing Assembly, Direct Mount)	19138 - 19268 (Y2S-19268) Tapered Roller Bearings - 2TS-DM (Matched Bearing Assembly, Direct Mount)
Cone Part Number	N/A 11590	N/A 12580	N/A LM48548	N/A HM88649	N/A 19138
Cup Part Number	N/A 11520	N/A 12520	N/A LM48510	N/A HM88610	N/A 19268
Outer Spacer Part Number	N/A Y2S-11520	N/A Y1S-12520	N/A LM48510EE	N/A HM88610EA	N/A Y2S-19268
d - Bore	N/A 5/8 in15.875 mm	N/A 0.8125 in20.638 mm	N/A 1 3/8 in34.925 mm	N/A 1 3/8 in34.925 mm	N/A 1.3770 in34.976 mm
D - Cup Outer Diameter	N/A 1.6875 in42.863 mm	N/A 1.9380 in49.225 mm	N/A 2.5625 in65.088 mm	N/A 2.8438 in72.233 mm	N/A 2.6875 in68.263 mm
T - Width	N/A 1.125 in28.575 mm	N/A 1.5626 in39.69 mm	N/A 1.4200 in36.068 mm	N/A 2 in50.8 mm	N/A 1.25 in31.75 mm
B - Width	N/A 1.125 in28.575 mm	N/A 1.5626 in39.69 mm	N/A 1.4400 in36.576 mm	N/A 2 in50.8 mm	N/A 1.3008 in33.04 mm
R - Cone Backface "To Clear" Radius¹	N/A 0.010 in0.3 mm	N/A 0.010 in0.3 mm	N/A 0.02 in0.4 mm	N/A 0.010 in0.3 mm	N/A 0.010 in0.3 mm
r - Cup Backface "To Clear" Radius²	N/A 0.06 in1.52 mm	N/A 0.06 in1.52 mm	N/A 0.050 in1.27 mm	N/A 0.090 in2.29 mm	N/A 0.06 in1.52 mm
db - Cone Backface Backing Diameter	N/A 0.96 in24.5 mm	N/A 1.12 in28.5 mm	N/A 1.89 in48 mm	N/A 1.91 in48.5 mm	N/A 1.67 in42.5 mm
Da - Cup Frontface Backing Diameter	N/A 1.59 in40.39 mm	N/A 1.81 in45.97 mm	N/A 2.44 in61.00 mm	N/A 2.74 in69.10 mm	N/A 2.60 in66.00 mm
C90 - Dynamic Radial Rating (90 million revolutions)³	N/A 1100 lbf4870 N	N/A 2540 lbf11300 N	N/A 3760 lbf16700 N	N/A 4480 lbf19900 N	N/A 2960 lbf13100 N
C1 - Dynamic Radial Rating (1 million revolutions)⁴	N/A 7360 lbf32700 N	N/A 17100 lbf76000 N	N/A 25300 lbf112000 N	N/A 30100 lbf134000 N	N/A 19800 lbf88300 N
C_a90 - Dynamic Thrust Rating (90 million revolutions)⁵	N/A 1320 lbf5860 N	N/A 1410 lbf6260 N	N/A 2430 lbf10800 N	N/A 4180 lbf18600 N	N/A 2250 lbf10000 N
C90₍₂₎ - Dynamic Radial Rating (Two-Row, 90 million revolutions)⁶	N/A 1910 lbf8490 N	N/A 4430 lbf19700 N	N/A 6550 lbf29200 N	N/A 7790 lbf34700 N	N/A 5150 lbf22900 N
K - Factor⁷	N/A 0.83	N/A 1.81	N/A 1.55	N/A 1.07	N/A 1.31
e - ISO Factor⁸	N/A 0.7	N/A 0.32	N/A 0.38	N/A 0.55	N/A 0.44
Y1 - ISO Factor⁹	N/A 0.96	N/A 2.09	N/A 1.79	N/A 1.24	N/A 1.52
Y2 - ISO Factor¹⁰	N/A 1.43	N/A 3.11	N/A 2.67	N/A 1.84	N/A 2.26
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.