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Vishay Spectrol 21-1-11 Counting Dial
Vishay Spectrol 21-1-11 Counting Dial is a precision 15-turn dial counter designed for accurate adjustment, visual position indication and repeatable control of compatible multi-turn potentiometers and shaft-operated devices. It features a mechanical turn counter, a graduated vernier scale and an integrated locking lever for maintaining the selected setting.
This industrial counting dial is part of the Vishay Spectrol Model 21 series. It has an approximately 46 mm diameter body and is designed for direct installation on a standard 1/4-inch, or 6.35 mm, diameter shaft. Its satin silver finish, black knob and clearly marked scale provide excellent readability in industrial control panels and electrical equipment.
15-Turn Mechanical Counter and Vernier Scale
The dial provides a 15-turn adjustment range for applications requiring precise control over multiple shaft rotations. The mechanical counter window displays the number of completed turns, while the circular vernier scale indicates the position within the current rotation.
This combination allows operators to identify and reproduce specific equipment settings more accurately than with a standard control knob. The counter reading increases during clockwise rotation and decreases during counterclockwise rotation, providing a clear visual reference for adjustment.
The Vishay Spectrol 21-1-11 Counting Dial is particularly useful where equipment settings must be recorded, repeated or returned to a previously established operating position.
Integrated Locking Device
An integrated brake lever allows the operator to lock the counting dial after selecting the required position. The locking mechanism helps prevent accidental movement caused by vibration, physical contact or routine operation of nearby panel components.
This feature is valuable in generator panels, SCR control panels, drilling equipment and industrial systems where unintentional adjustment could affect equipment performance. The lock can be released when a new setting is required and engaged again after adjustment.
Compatible 1/4-Inch Shaft Mounting
The Spectrol Model 21 dial mounts directly onto a 1/4-inch diameter shaft, equivalent to approximately 6.35 mm. It is secured using an integrated hex socket set screw, providing a stable mechanical connection between the dial and the shaft-operated component.
Before installation, the shaft position and dial counter should be aligned according to the required equipment setting. Correct alignment helps ensure that the displayed counter value accurately represents the operating position of the connected potentiometer or control device.
Industrial Panel Applications
The Vishay Spectrol 21-1-11 Counting Dial can be used with compatible multi-turn potentiometers and control devices installed in industrial electrical panels. Typical applications include generator control panels, SCR panels, power control systems, industrial automation equipment and drilling control units.
It may also be used in laboratory instruments, test equipment, process control systems and other devices requiring accurate multi-turn adjustment with a visible position indication.
Compatibility should be confirmed using the shaft diameter, available panel clearance, required number of turns and mounting dimensions before installation.
Durable and Readable Design
The dial has a satin silver or satin chrome appearance with black markings and a black control knob. The contrasting markings help operators read the counter and graduated scale under normal panel operating conditions.
Its approximately 46 mm diameter provides a practical balance between readability and panel space. The durable mechanical design makes it suitable for industrial environments where reliable manual adjustment is required.
Key Features
- Precision 15-turn counting dial
- Mechanical completed-turn counter
- Graduated circular vernier scale
- Integrated locking and brake lever
- Approximately 46 mm dial diameter
- Compatible with 1/4-inch or 6.35 mm shafts
- Direct shaft mounting
- Hex socket set screw fastening
- Satin silver finish with black markings
- Black adjustment knob
- Clockwise increasing counter indication
- Suitable for industrial control panels
Product Identification
- Manufacturer: Vishay
- Brand: Spectrol
- Series: Model 21
- Part Number: 21-1-11
- Product Type: Multi-Turn Counting Dial
- Number of Turns: 15 Turns
- Shaft Diameter: 1/4 Inch
- Metric Shaft Diameter: 6.35 mm
- Nominal Dial Diameter: 46 mm
- Scale Type: Vernier Scale
- Locking Mechanism: Integrated Brake Lever
Manufacturer Technical Information
For official dimensional drawings, installation guidance and ordering information, refer to the Vishay Spectrol Model 21 technical datasheet published by the manufacturer.
The Vishay Spectrol 21-1-11 Counting Dial provides a reliable solution for precise manual control, repeatable adjustment and secure position indication in generator panels, SCR panels and other industrial control applications.
View the official Vishay Spectrol Model 21 datasheet for technical specifications, dimensions, shaft options, mounting details and ordering information for the 46 mm diameter, 15-turn counting dial.
View Vishay Spectrol Model 21 Official Datasheet
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