Aerospace / Military
Aerospace Series General Aviation Rod Ends Spherical Bearings Mil Spec Series Rod Ends Spherical Bearings Bushings Approved Part Numbers
Commercial / Industrial
Rod End Bearings Inch Rod Ends Metric Rod Ends Spherical Bearings Inch Spherical Bearings Metric Spherical Bearings
Technical Resources
Terms and Definitions Articles Technical Data FAQs Key Term Translation Custom Engineered Products
Online Catalog
Engineers power search our entire catalog of bearing and bushings, with access to every attribute and technical specification possible. View our online catalog...
Request Information
TNA bearings are similar to the TDO, but the inner race narrow faces are extended to abut and eliminate the need for a separate inner race spacer. Supplied with an in-built clearance to give a standard setting range, these bearings provide a solution for many fixed or floating bearing applications where simplicity of assembly is required.

Design Attributes:
  • Double cup and two single cones
  • Internal bearing clearance controlled by extending the front faces of the cones so they contact each other
  • SW variation features chamfers in the bores at the front faces of the two single cones to form a lubrication groove
  • SE variation features a backface rib design to accommodate radial lip seals or stamped closure
Unit of Measure

Key Dimensions

Cone Part Number

 N/A NA643SW

Cup Part Number

 N/A 632D

Design Unit

 N/A Inch

Bore (d)

 N/A 2 3/4 in69.850 mm

O.D. (D)

 N/A 5.3750 in136.525 mm
Dynamic Radial Load Rating - 90M Revs (C90) 1 N/A 13600 lbf60400 N
Dynamic Radial Load Rating 2-Row - 90M Revs (C90-2row)2 N/A 23600 lbf105000 N
K Factor 3 N/A 1.61
e Factor 4 N/A 0.36

Other Dimensions

T - Bearing Width across Cones

 N/A 3.7500 in95.250 mm
Max Shaft Fillet Radius5 N/A 0.140 in3.5 mm
Max Housing Fillet Radius6 N/A 0.06 in1.5 mm

Outer Ring Width (C)

 N/A 3 in76.2 mm

Shaft Backing Shoulder Diameter - Backface (db)

 N/A 3.39 in86 mm

Housing Backing Shoulder Diameter - Frontface (Da)

 N/A 4.96 in125.98 mm

Weight

 N/A 13.01 lb5.92 Kg

Ratings

C1 - Dynamic Radial Rating (1 million revolutions)7 N/A 91200 lbf406000 N
Ca90 - Dynamic Thrust Rating (90 million revolutions)8 N/A 8420 lbf37400 N

Factors

Y1 Factor 9 N/A 1.86
Y2 Factor 10 N/A 2.78
  • 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 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 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.
  • 5 These maximum fillet radii will be cleared by the bearing corners.
  • 6 These maximum fillet radii will be cleared by the bearing corners.
  • 7 Based on 1 x 106 revolutions L10 life, for the ISO life calculation method.
  • 8 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.
  • 9 These factors apply for both inch and metric calculations. Consult your Timken representative for instruction on use.
  • 10 These factors apply for both inch and metric calculations. Consult your Timken representative for instruction on use.