All Product Types > ENGINEERED BEARINGS > Tapered Roller Bearings > Tapered Roller Bearings - TS (Tapered Single) > Tapered Roller Bearings - TS (Tapered Single) Imperial > Part Number 321 - 312  

Part Number 321 - 312, Tapered Roller Bearings - TS (Tapered Single) Imperial

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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.




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

Specifications

Series
315

Cone Part Number
321

Cup Part Number
312

Design Unit
Inch

Cage Material
Stamped Steel


Dimensions

d - Bore
1.0148 in
25.776 mm

D - Cup Outer Diameter
2.8593 in
72.626 mm

B - Cone Width
0.8730 in
22.174 mm

C - Cup Width
0.9375 in
23.813 mm

T - Bearing Width
1.0627 in
26.993 mm


Abutment and Fillet Dimensions

R - Cone Backface "To Clear" Radius1
0.03 in
0.760 mm

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

da - Cone Frontface Backing Diameter
1.3 in
33 mm

db - Cone Backface Backing Diameter
1.34 in
34 mm

Da - Cup Frontface Backing Diameter
2.68 in
67.10 mm

Db - Cup Backface Backing Diameter
2.48 in
62.99 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
-0.27 in
-6.9 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
4370 lbf
19400 N

C1 - Dynamic Radial Rating (1 million revolutions)2
16800 lbf
74900 N

C0 - Static Radial Rating
16800 lbf
74800 N

Ca90 - Dynamic Thrust Rating (90 million revolutions)3
1880 lbf
8370 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
2.32

e - ISO Factor2
0.25

Y - ISO Factor3
2.38

G1 - Heat Generation Factor (Roller-Raceway)
20.3

G2 - Heat Generation Factor (Rib-Roller End)
7.9

Cg - Geometry Factor4
0.0602
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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