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Part Number NA48990SW - 48920D, 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
NA48990SW

Cup Part Number
48920D

Design Unit
Inch


Dimensions

d - Bore
6 in
152.400 mm

D - Cup Outer Diameter
8.3125 in
211.138 mm

T - Bearing Width across Cones
3.625 in
92.075 mm

C - Double Cup Width
2.75 in
69.85 mm


Abutment and Fillet Dimensions

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

r - Cup Backface "To Clear" Radius2
0.030 in
0.8 mm

db - Cone Backface Backing Diameter
6.61 in
168 mm

Da - Cup Frontface Backing Diameter
8.03 in
204.00 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

C1 - Dynamic Radial Rating (1 million revolutions)1
114000 lbf
508000 N

Ca90 - Dynamic Thrust Rating (90 million revolutions)2
10400 lbf
46200 N

C90(2) - Dynamic Radial Rating (Two-Row, 90 million revolutions)3
29600 lbf
132000 N
1 Based on 1 x 106 revolutions L10 life, for the ISO life calculation method.
2 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.
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
1.64

e - ISO Factor2
0.36

Y1 - ISO Factor3
1.89

Y2 - ISO Factor4
2.82
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.


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