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All Product Types > ENGINEERED BEARINGS > Tapered Roller Bearings > Tapered Roller Bearings - TS (Tapered Single) > Tapered Roller Bearings - TS (Tapered Single) Imperial > Part Number LM12749 - LM12711  
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Part Number LM12749 - LM12711, Tapered Roller Bearings - TS (Tapered Single) Imperial


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.



Unit of Measure: Imperial Metric Both

Specifications  · Dimensions  · Abutment and Fillet Dimensions  · Basic Load Ratings  · Factors

Specifications

Series
LM12700

Cone Part Number
LM12749

Cup Part Number
LM12711

Design Unit
Inch

Cage Material
Stamped Steel

Related Assembly Number(s)
LM12749-90402


Dimensions

d - Bore
0.8656 in
21.986 mm

D - Cup Outer Diameter
1.8100 in
45.974 mm

B - Cone Width
0.6550 in
16.637 mm

C - Cup Width
0.4750 in
12.065 mm

T - Bearing Width
0.6100 in
15.494 mm


Abutment and Fillet Dimensions

R - Cone Backface "To Clear" Radius1
0.050 in
1.270 mm

r - Cup Backface "To Clear" Radius2
0.050 in
1.27 mm

da - Cone Frontface Backing Diameter
1.02 in
26 mm

db - Cone Backface Backing Diameter
1.08 in
27.5 mm

Da - Cup Frontface Backing Diameter
1.69 in
42.93 mm

Db - Cup Backface Backing Diameter
1.57 in
39.88 mm

Ab - Cage-Cone Frontface Clearance
0.04 in
1 mm

Aa - Cage-Cone Backface Clearance
0.01 in
0.3 mm

a - Effective Center Location3
-0.21 in
-5.3 mm
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.


Basic Load Ratings

C90 - Dynamic Radial Rating (90 million revolutions)1
2250 lbf
10000 N

C1 - Dynamic Radial Rating (1 million revolutions)2
8680 lbf
38600 N

C0 - Static Radial Rating
7930 lbf
35300 N

Ca90 - Dynamic Thrust Rating (90 million revolutions)3
1180 lbf
5250 N
1 Based on 90 x 106 revolutions L10 life, for The Timken Company life calculation method. C90 and Ca90 are radial and thrust values.
2 Based on 1 x 106 revolutions L10 life, for the ISO life calculation method.
3 Based on 90 x 106 revolutions L10 life, for The Timken Company life calculation method. C90 and Ca90 are radial and thrust values for a single-row, C90(2) is the two-row radial value.


Factors

K - Factor1
1.91

e - ISO Factor2
0.31

Y - ISO Factor3
1.96

G1 - Heat Generation Factor (Roller-Raceway)
8.2

G2 - Heat Generation Factor (Rib-Roller End)
6.98

Cg - Geometry Factor4
0.048
1 These factors apply for both inch and metric calculations. Consult your Timken representative for instruction on use.
2 These factors apply for both inch and metric calculations. Consult your Timken representative for instruction on use.
3 These factors apply for both inch and metric calculations. Consult your Timken representative for instruction on use.
4 Geometry constant for Lubrication Life Adjustment Factor a3l.



 DOWNLOADS 

Tapered Roller Bearing Engineering Information
(PDF, 663KB)

Bearing Life Calculation Tool

Bearing Dimensional Tolerances



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