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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 LL771948 - LL771911  
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Part Number LL771948 - LL771911, 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
LL771900

Cone Part Number
LL771948

Cup Part Number
LL771911

Design Unit
Inch

Cage Material
Stamped Steel

Related Assembly Number(s)
LL771948-90010
LL771948-903A5


Dimensions

d - Bore
18.7500 in
476.250 mm

D - Cup Outer Diameter
22.2500 in
565.150 mm

B - Cone Width
1.625 in
41.275 mm

C - Cup Width
1.2500 in
31.750 mm

T - Bearing Width
1.6250 in
41.275 mm


Abutment and Fillet Dimensions

R - Cone Backface "To Clear" Radius1
0.13 in
3.300 mm

r - Cup Backface "To Clear" Radius2
0.130 in
3.30 mm

da - Cone Frontface Backing Diameter
19.33 in
491 mm

db - Cone Backface Backing Diameter
19.49 in
495 mm

Da - Cup Frontface Backing Diameter
21.66 in
548.90 mm

Db - Cup Backface Backing Diameter
21.38 in
543.05 mm

Ab - Cage-Cone Frontface Clearance
0.12 in
3 mm

Aa - Cage-Cone Backface Clearance
0.1 in
2.5 mm

a - Effective Center Location3
2.3 in
58.4 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
27400 lbf
122000 N

C1 - Dynamic Radial Rating (1 million revolutions)2
106000 lbf
469000 N

C0 - Static Radial Rating
315000 lbf
1400000 N

Ca90 - Dynamic Thrust Rating (90 million revolutions)3
22000 lbf
97800 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
1.24

e - ISO Factor2
0.47

Y - ISO Factor3
1.28

G1 - Heat Generation Factor (Roller-Raceway)
3790

G2 - Heat Generation Factor (Rib-Roller End)
1240

Cg - Geometry Factor4
0.219
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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