• Vernier scale
  • No. 4-40 hex socket set screw for mounting
  • Brake lever knob
  • Open window display
  • Satin chrome finish, black markings
  • SpectrolModel 21

    Dial - 1 13/16" diameter, 1/4" dia.
    Photo of Model 21 Dial

    Spectrol No.NTE Part No.Numeric
    No. of
    Vernier Scale15D3

    Dimensional Drawing


    Readout and Operation: Unit shall register a total count of 1499. The number in the center of the window (0 thru 14) indicates completed number of turns of the drive sleeve. Graduated circular dial indicates the percent of a partial turn of the drive sleeve.
    Minor Scale Division: 1/100 turn
    Indication: 0 to 14.99 turn
    Accuracy: Backlash shall be zero between graduated dial and drive sleeve.
    Rotation: The indication shall increase with clockwise and decrease with a counterclockwise rotation.
    Transfer Point: The number in the center of the window shall change as graduated dial rotates between 94 and 0.

    Shaft Bore: 0.250"
    Runout: 0.004in/in (Note 1)
    Mounting: Unit shall mount directly to shaft with No. 4-40 hex socket set screw, located adjacent to No. 75 on graduated dial (hex key included).

    Note 1. Dial to be free running and without binds when axis of drive sleeve is perpendicular to mounting surface within the specified dimension.

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