Vlier PRT500 Knob Handle Plunger 1/2-13 Non-locking

Product Description

The VLIER PRT500 is a non-locking knob handle plunger designed for indexing, positioning, and spring-loaded engagement applications in industrial and mechanical assemblies. The plunger features a 1/2-13 threaded body and a Delrin knob for manual actuation without tools. Initial end force is 0.5 pounds, building to a final end force of 1.75 pounds, making it suitable for light-duty positioning tasks where repeatable spring resistance is required. The steel construction with black finish provides corrosion resistance suitable for typical shop and production environments. Machinists, tool and die technicians, and assembly line maintenance personnel are the primary installers of this component.

The PRT500 is used in fixtures, jigs, tooling plates, and machine panels where a manually retractable plunger is needed to locate or retain a component without a locking mechanism. The 1/2-13 thread allows installation into standard tapped holes in steel or aluminum assemblies. With a body length of 1.25 inches and a plunger projection of 0.25 inches, it fits into tight panel sections or shallow mounting bosses. Applications include production tooling, drawer stops, panel latching, and equipment positioning systems across light manufacturing and automation environments.

Key Features

• Non-locking plunger design allows free retraction under manual pressure
• Delrin knob provides tool-free hand actuation
• 0.5 pound initial to 1.75 pound final end force for consistent spring resistance
• 1/2-13 thread for installation into standard tapped holes
• Steel body with black finish for durability in industrial settings
• Compact 1.25 inch body length suited for shallow panel or fixture mounting

Compatibility

Designed as an OEM-style replacement or direct-fit component for standard 1/2-13 tapped-hole plunger applications in industrial fixtures, tooling assemblies, and mechanical positioning systems.

Installation Notes

Installation is performed by threading the PRT500 body into a prepared 1/2-13 tapped hole using the hex across the body. Ensure the mating bore is clean and free of debris before installation. Disengage or de-energize any moving machinery before servicing or replacing plunger components. Do not exceed the rated end force by modifying or preloading the spring beyond its designed travel.