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Part Number NA9378 - 9320D, Tapered Roller Bearings - TNA (Tapered Double, non-adjustable) Imperial

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

Specifications

Cone Part Number
NA9378

Cup Part Number
9320D

Related Assembly Number(s)
NA9378-90014

Design Unit
Inch


Dimensions

d - Bore
3 in
76.2 mm

D - Cup Outer Diameter
7.0000 in
177.800 mm

T - Bearing Width across Cones
4.3125 in
109.538 mm

C - Double Cup Width
2.9375 in
74.613 mm


Abutment and Fillet Dimensions

R - Cone Backface "To Clear" Radius1
0.14 in
3.5 mm

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

db - Cone Backface Backing Diameter
4.13 in
105 mm

Da - Cup Frontface Backing Diameter
6.48 in
164.59 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.


Basic Load Ratings

C90 - Dynamic Radial Rating (90 million revolutions)1
21200 lbf
94100 N

C1 - Dynamic Radial Rating (1 million revolutions)2
142000 lbf
632000 N

Ca90 - Dynamic Thrust Rating (90 million revolutions)3
27700 lbf
123000 N

C90(2) - Dynamic Radial Rating (Two-Row, 90 million revolutions)4
36800 lbf
164000 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.
4 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
0.76

e - ISO Factor2
0.76

Y1 - ISO Factor3
0.88

Y2 - ISO Factor4
1.31
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 These factors apply for both inch and metric calculations. Consult your Timken representative for instruction on use.


 MORE IMAGES 

·  timken-TNA-cutaway-angle-view

·  timken-TNA-left-angle-view

·  Timken TRB TNA



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