NTE Electronics 21 Catalog Page

Features

• Vernier scale

• No. 4−40 hex socket set screw for mounting

• Brake lever knob

• Open window display

• Satin chrome finish, black markings

Spectrol Model 21

Dial − 1 13/16” diameter, 1/4” dia
shaft

D3

1.000 (25.4)

1.094 (27.79) R Max

22°

46°

Spectrol No. NTE Part No.

21−1−11 503−0006 Vernier Scale 15 D3

Numeric

Display

No. of
Turns

Diag

No.

.125

(3.18)

.250

(6.35)

.390

(9.91)

.128

(3.25)

.268

(6.81)

.578

(14.68)

(23.42)

.922

1.812 (46.02)
Dia

Set Screw
(At No. 75 on Dial Face)

Specifications

Operation

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.

Mechanical

Shaft Bore: 0.250”
Runout: 0.004 in/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.

NTE Electronics, Inc. D Voice (973) 748−5089 D FAX (973) 748−6224 D http://www.nteinc.com

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