Oak Grigsby 78016 Rotary Encoder 5V Quadrature 64 CPR 256 Transitions Panel

Oak Grigsby 78016 Rotary Encoder 5V Quadrature 64 CPR 256 Transitions Panel Mount

The Oak Grigsby 78016 is a compact incremental rotary encoder producing quadrature A/B output signals at 5V logic levels. It generates 64 pulses per revolution — yielding 256 countable transitions per revolution in 4x quadrature counting mode — and mounts through a panel via its threaded bushing with a solid shaft. Oak Grigsby (based in Sugar Grove, IL) has long been a supplier of mechanical and electromechanical encoder components for industrial and instrument applications.

Specifications & What's Included

• Part Number: 78016
• Manufacturer: Oak Grigsby, Sugar Grove, IL
• Type: Incremental rotary encoder
• Output type: Quadrature (two-channel A/B)
• Supply voltage: 5V
• Pulses per revolution: 64 CPR
• Transitions per revolution: 256 (4x quadrature decode)
• Mounting: Panel mount — threaded bushing
• Shaft: Solid, threaded bushing panel mount
• Electrical interface: PCB pin header (+, A, B, −)
• Date code: 9851 (week 51 of 1998 — late-1990s NOS)
• Body diameter (approximate, per calipers in photos): ~25 mm

Applications

Incremental rotary encoders like the Oak Grigsby 78016 are used wherever a control system needs to track shaft rotation, angular position, or user input — they are still standard components across a wide range of equipment today. Common applications include industrial control panels and operator interfaces (where they serve as position or speed setpoint knobs), CNC and motion control systems, medical and laboratory instrumentation, audio/video production equipment, and general-purpose embedded systems requiring reliable rotational input. The quadrature A/B output allows host circuitry to determine both the amount and the direction of rotation, making this type of encoder more capable than a simple pulse-output device. The 64 CPR resolution is a standard choice for manual operator controls — fine enough for precise adjustment, but not so high that it requires high-speed counting circuitry. Panel-mount encoders of this style and generation were widely used in test instruments, programmable controllers, and rack-mount equipment from the 1980s through the 2000s and remain in demand for repair, replacement, and new designs that need proven mechanical components.