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All Product Types > ENGINEERED BEARINGS > Tapered Roller Bearings > Tapered Roller Bearings - TNA (Tapered Double, non-adjustable) Imperial > Part Number NA28138 - 28318D  
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Part Number NA28138 - 28318D, Tapered Roller Bearings - TNA (Tapered Double, non-adjustable) Imperial






Unit of Measure: Imperial Metric Both

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

Specifications

Cone Part Number
NA28138

Cup Part Number
28318D

Design Unit
Inch


Dimensions

d - Bore
1.3770 in
34.976 mm

D - Cup Outer Diameter
3.1510 in
80.035 mm

T - Bearing Width across Cones
1.8126 in
46.04 mm

C - Double Cup Width
1.3750 in
34.925 mm


Abutment and Fillet Dimensions

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

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

db - Cone Backface Backing Diameter
1.71 in
43.5 mm

Da - Cup Frontface Backing Diameter
2.91 in
73.90 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
4390 lbf
19500 N

C1 - Dynamic Radial Rating (1 million revolutions)2
24800 lbf
111000 N

Ca90 - Dynamic Thrust Rating (90 million revolutions)3
3020 lbf
13400 N

C90(2) - Dynamic Radial Rating (Two-Row, 90 million revolutions)4
7640 lbf
34000 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
1.45

e - ISO Factor2
0.4

Y1 - ISO Factor3
1.68

Y2 - ISO Factor4
2.5
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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