2TS-DM assemblies are comprised of two single-row bearings with abutting back facing inner rings and an outer ring spacer with lubricating holes is typical. These are generally used at fixed positions on rotating shaft applications.

Design Attributes:
  • Two single row bearings, with or without a spacer
  • When spacers are used, bearing is furnished as a preset, matched assembly
  • Spacers available with or without lubricant grooves and holes
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    Unit of Measure

    Other Dimensions

    Weight

    		 N/A 5.23 Kg11.55 lb

    Width (T)

    		 N/A 2.875 in73.025 mm

    B - Width

    		 N/A 2.6170 in66.472 mm
    Max Shaft Fillet Radius1 N/A 0.02 in0.50 mm
    Max Housing Fillet Radius2 N/A 0.090 in2.29 mm

    Shaft Backing Shoulder Diameter - Backface (db)

    		 N/A 3.35 in85 mm

    Housing Backing Shoulder Diameter - Frontface (Da)

    		 N/A 5.22 in132.59 mm

    Key Dimensions

    Cone Part Number

    		 N/A 78250

    Cup Part Number

    		 N/A 78551

    Related Assembly Number(s)

    		 N/A 78250-90027

    Outer Spacer Part Number

    		 N/A Y2S-78551

    Design Unit

    		 N/A Inch

    Bore (d)

    		 N/A 2.5000 in63.500 mm

    O.D. (D)

    		 N/A 5.5130 in140.030 mm
    Dynamic Radial Load Rating - 90M Revs (C90) 3 N/A 11800 lbf52600 N
    Dynamic Radial Load Rating 2-Row - 90M Revs (C90-2row)4 N/A 20600 lbf91500 N
    K Factor 5 N/A 0.67
    e Factor 6 N/A 0.87

    Ratings

    C1 - Dynamic Radial Rating (1 million revolutions)7 N/A 79300 lbf353000 N
    Ca90 - Dynamic Thrust Rating (90 million revolutions)8 N/A 17500 lbf77900 N

    Factors

    Y1 Factor 9 N/A 0.78
    Y2 Factor 10 N/A 1.16
    • 1 These maximum fillet radii will be cleared by the bearing corners.
    • 2 These maximum fillet radii will be cleared by the bearing corners.
    • 3 Based on 90 x 106 revolutions L10 life, for The Timken Company life calculation method. C90 and Ca90 are radial and thrust values.
    • 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.
    • 5 These factors apply for both inch and metric calculations. Consult your Timken representative for instruction on use.
    • 6 These factors apply for both inch and metric calculations. Consult your Timken representative for instruction on use.
    • 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.