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All Product Types > ENGINEERED BEARINGS > Tapered Roller Bearings > Tapered Roller Bearings - TNA (Tapered Double, non-adjustable) Imperial > Part Number NA438 - 432D  
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Part Number NA438 - 432D, 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
NA438

Cup Part Number
432D

Design Unit
Inch


Dimensions

d - Bore
1 3/4 in
44.450 mm

D - Cup Outer Diameter
3.7500 in
95.250 mm

T - Bearing Width across Cones
2.4376 in
61.915 mm

C - Double Cup Width
2.0000 in
50.800 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
2.24 in
57 mm

Da - Cup Frontface Backing Diameter
3.46 in
87.12 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
7400 lbf
32900 N

C1 - Dynamic Radial Rating (1 million revolutions)2
49700 lbf
221000 N

Ca90 - Dynamic Thrust Rating (90 million revolutions)3
3600 lbf
16000 N

C90(2) - Dynamic Radial Rating (Two-Row, 90 million revolutions)4
12900 lbf
57300 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
2.05

e - ISO Factor2
0.28

Y1 - ISO Factor3
2.37

Y2 - ISO Factor4
3.53
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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