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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 NA48990SW

Cup Part Number

 N/A 48920D

Bore (d)

 N/A 6.0000 in152.400 mm

O.D. (D)

 N/A 8.3125 in211.138 mm

Width (T)

 N/A 3.6250 in92.075 mm
Dynamic Radial Load Rating - 1M Revs (C1)1 N/A 114000 lbf508000 N
Dynamic Radial Load Rating 2-Row - 90M Revs (C90-2row)2 N/A 29600 lbf132000 N
e Factor 3 N/A 0.36
K Factor 4 N/A 1.64

Other Dimensions

Weight

 N/A 20.399 lb9.26 Kg

Outer Ring Width (C)

 N/A 2.75 in69.85 mm
Max Shaft Fillet Radius5 N/A 0.140 in3.5 mm
Max Housing Fillet Radius6 N/A 0.03 in0.8 mm

Shaft Backing Shoulder Dia. - Backface (db)

 N/A 6.61 in168 mm

Housing Backing Shoulder Dia. - Frontface (Da)

 N/A 8.03 in204.00 mm

Ratings

Dynamic Axial Rating - 90M Revs (Ca90)7 N/A 10400 lbf46200 N

Factors

Y1 Factor 8 N/A 1.89
Y2 Factor 9 N/A 2.82
  • 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 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 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.
  • 8 These factors apply for both inch and metric calculations. Consult your Timken representative for instruction on use.
  • 9 These factors apply for both inch and metric calculations. Consult your Timken representative for instruction on use.