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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 21075 - 21212  
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Part Number 21075 - 21212, 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
21000

Cone Part Number
21075

Cup Part Number
21212

Design Unit
Inch

Cage Material
Stamped Steel

Related Assembly Number(s)
21075-90010
21075-90011
21075-90025
21075-90026
21075-902A3


Dimensions

d - Bore
0.7500 in
19.05 mm

D - Cup Outer Diameter
2.1250 in
53.975 mm

B - Cone Width
0.8598 in
21.839 mm

C - Cup Width
0.6250 in
15.875 mm

T - Bearing Width
0.8750 in
22.225 mm


Abutment and Fillet Dimensions

R - Cone Backface "To Clear" Radius1
0.06 in
1.5 mm

r - Cup Backface "To Clear" Radius2
0.090 in
2.29 mm

da - Cone Frontface Backing Diameter
1.03 in
26 mm

db - Cone Backface Backing Diameter
1.24 in
31.5 mm

Da - Cup Frontface Backing Diameter
2.01 in
51.05 mm

Db - Cup Backface Backing Diameter
1.69 in
42.93 mm

Ab - Cage-Cone Frontface Clearance
0.09 in
2.3 mm

Aa - Cage-Cone Backface Clearance
0.1 in
2.5 mm

a - Effective Center Location3
-0.23 in
-5.8 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
3210 lbf
14300 N

C1 - Dynamic Radial Rating (1 million revolutions)2
12400 lbf
55100 N

C0 - Static Radial Rating
9560 lbf
42500 N

Ca90 - Dynamic Thrust Rating (90 million revolutions)3
3250 lbf
14400 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
0.99

e - ISO Factor2
0.59

Y - ISO Factor3
1.02

G1 - Heat Generation Factor (Roller-Raceway)
7

G2 - Heat Generation Factor (Rib-Roller End)
3.55

Cg - Geometry Factor4
0.0558
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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