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All Product Types > ENGINEERED BEARINGS > Tapered Roller Bearings > Tapered Roller Bearings - TNA (Tapered Double, non-adjustable) Imperial > Part Number NA3780 - 3729D  
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Part Number NA3780 - 3729D, 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
NA3780

Cup Part Number
3729D

Related Assembly Number(s)
NA3780-90071

Design Unit
Inch


Dimensions

d - Bore
2 in
50.8 mm

D - Cup Outer Diameter
3.6718 in
93.264 mm

T - Bearing Width across Cones
2.5625 in
65.088 mm

C - Double Cup Width
2.0625 in
52.388 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
2.52 in
64 mm

Da - Cup Frontface Backing Diameter
3.50 in
88.90 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
7120 lbf
31700 N

C1 - Dynamic Radial Rating (1 million revolutions)2
47800 lbf
213000 N

Ca90 - Dynamic Thrust Rating (90 million revolutions)3
4120 lbf
18300 N

C90(2) - Dynamic Radial Rating (Two-Row, 90 million revolutions)4
12400 lbf
55100 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
1.73

e - ISO Factor2
0.34

Y1 - ISO Factor3
1.99

Y2 - ISO Factor4
2.97
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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