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

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Unit of Measure

Items	LM12749 - LM12711 (K523966R) Tapered Roller Bearings - 2TS-IM (Matched Bearing Assembly, Indirect Mount)	LM12749 - LM12711 (K168902 - K168901) Tapered Roller Bearings - 2TS-IM (Matched Bearing Assembly, Indirect Mount)	L44643 - L44610 (L44643XA - L44610EB) Tapered Roller Bearings - 2TS-IM (Matched Bearing Assembly, Indirect Mount)	07100 - 07196 (X1S-07100 - Y1S-07196) Tapered Roller Bearings - 2TS-IM (Matched Bearing Assembly, Indirect Mount)	M88040A - M88010 (M88040XA) Tapered Roller Bearings - 2TS-IM (Matched Bearing Assembly, Indirect Mount)
Cone Part Number	N/A LM12749	N/A LM12749	N/A L44643	N/A 07100	N/A M88040A
Cup Part Number	N/A LM12711	N/A LM12711	N/A L44610	N/A 07196	N/A M88010
Inner Spacer Part Number	N/A K523966R	N/A K168902	N/A L44643XA	N/A X1S-07100	N/A M88040XA
Outer Spacer Part Number	N/A	N/A K168901	N/A L44610EB	N/A Y1S-07196	N/A
d - Bore	N/A 0.8656 in21.986 mm	N/A 0.8656 in21.986 mm	N/A 1 in25.40 mm	N/A 1 in25.40 mm	N/A 1 1/8 in28.575 mm
D - Cup Outer Diameter	N/A 1.8100 in45.974 mm	N/A 1.8100 in45.974 mm	N/A 1.9800 in50.292 mm	N/A 1.9687 in50.005 mm	N/A 2.6875 in68.263 mm
T - Width	N/A 1.3760 in34.950 mm	N/A 1.4367 in36.492 mm	N/A 1.95 in49.53 mm	N/A 1.3126 in33.34 mm	N/A 1.9459 in49.425 mm
C - Width	N/A 1.1060 in28.092 mm	N/A 1.1667 in29.634 mm	N/A 1.67 in42.418 mm	N/A 1 in25.4 mm	N/A 1.5709 in39.901 mm
R - Cone Backface "To Clear" Radius¹	N/A 0.050 in1.270 mm	N/A 0.050 in1.270 mm	N/A 0.050 in1.270 mm	N/A 0.040 in1 mm	N/A 0.010 in0.3 mm
r - Cup Backface "To Clear" Radius²	N/A 0.020 in0.40 mm	N/A 0.020 in0.40 mm	N/A 0.010 in0.3 mm	N/A 0.020 in0.40 mm	N/A 0.020 in0.40 mm
db - Cone Backface Backing Diameter	N/A 1.08 in27.5 mm	N/A 1.08 in27.5 mm	N/A 1.26 in32 mm	N/A 1.2 in30.5 mm	N/A 1.57 in40 mm
Da - Cup Frontface Backing Diameter	N/A 1.69 in42.93 mm	N/A 1.69 in42.93 mm	N/A 1.87 in47.50 mm	N/A 1.87 in47.50 mm	N/A 2.60 in66.00 mm
C90 - Dynamic Radial Rating (90 million revolutions)³	N/A 2250 lbf10000 N	N/A 2250 lbf10000 N	N/A 2080 lbf9230 N	N/A 1700 lbf7550 N	N/A 4450 lbf19800 N
C1 - Dynamic Radial Rating (1 million revolutions)⁴	N/A 15100 lbf67200 N	N/A 15100 lbf67200 N	N/A 13900 lbf62000 N	N/A 11400 lbf50700 N	N/A 29900 lbf133000 N
C_a90 - Dynamic Thrust Rating (90 million revolutions)⁵	N/A 1180 lbf5250 N	N/A 1180 lbf5250 N	N/A 1330 lbf5910 N	N/A 1170 lbf5190 N	N/A 4160 lbf18500 N
C90₍₂₎ - Dynamic Radial Rating (Two-Row, 90 million revolutions)⁶	N/A 3920 lbf17400 N	N/A 3920 lbf17400 N	N/A 3610 lbf16100 N	N/A 2950 lbf13100 N	N/A 7740 lbf34400 N
K - Factor⁷	N/A 1.91	N/A 1.91	N/A 1.56	N/A 1.45	N/A 1.07
e - ISO Factor⁸	N/A 0.31	N/A 0.31	N/A 0.37	N/A 0.4	N/A 0.55
Y1 - ISO Factor⁹	N/A 2.21	N/A 2.21	N/A 1.8	N/A 1.68	N/A 1.24
Y2 - ISO Factor¹⁰	N/A 3.28	N/A 3.28	N/A 2.69	N/A 2.5	N/A 1.84
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.