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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 LL687949 - LL687910  
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Part Number LL687949 - LL687910, 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
LL687900

Cone Part Number
LL687949

Cup Part Number
LL687910

Design Unit
Inch

Cage Material
Pin-Type

Related Assembly Number(s)
LL687949-90013
LL687949-90015


Dimensions

d - Bore
38.5000 in
977.900 mm

D - Cup Outer Diameter
44.5000 in
1130.300 mm

B - Cone Width
2.5 in
63.5 mm

C - Cup Width
1.8750 in
47.625 mm

T - Bearing Width
2.6250 in
66.675 mm


Abutment and Fillet Dimensions

R - Cone Backface "To Clear" Radius1
0.25 in
6.4 mm

r - Cup Backface "To Clear" Radius2
0.250 in
6.35 mm

da - Cone Frontface Backing Diameter
39.57 in
1005 mm

db - Cone Backface Backing Diameter
39.76 in
1010 mm

Da - Cup Frontface Backing Diameter
43.51 in
1105.15 mm

Db - Cup Backface Backing Diameter
43.11 in
1094.99 mm

Ab - Cage-Cone Frontface Clearance
0.46 in
11.68 mm

Aa - Cage-Cone Backface Clearance
0.15 in
3.81 mm

a - Effective Center Location3
4.52 in
114.8 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
97300 lbf
433000 N

C1 - Dynamic Radial Rating (1 million revolutions)2
375000 lbf
1670000 N

C0 - Static Radial Rating
1190000 lbf
5290000 N

Ca90 - Dynamic Thrust Rating (90 million revolutions)3
72700 lbf
323000 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
1.34

e - ISO Factor2
0.44

Y - ISO Factor3
1.38

G1 - Heat Generation Factor (Roller-Raceway)
18900

G2 - Heat Generation Factor (Rib-Roller End)
3190.6

Cg - Geometry Factor4
0.363
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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