Vlier PR500P Locking Pull Ring Plunger 1/2-13 Steel

Product Description

The VLIER PR500P is a locking pull ring plunger designed for precision positioning and retention applications in industrial and mechanical assemblies. The plunger features a 5/16-inch (0.312-inch) diameter tip with 1/2 inch of projection and delivers an initial end force of 2.5 pounds ramping to a final end force of 5 pounds, providing reliable, controlled resistance. The locking element engages via a pull ring mechanism that holds the plunger in the retracted position until released, making it well suited for fixtures, tooling, jigs, and adjustable assemblies. Licensed tradespeople and machine builders working with positioning hardware will find the steel construction durable across demanding production environments.

The PR500P threads into any 1/2-13 UNC tapped hole with a thread length of 1.4 inches and a body length of 2 inches. It is appropriate for use in machine tool fixtures, assembly jigs, workholding equipment, and general industrial positioning systems where a repeatable spring-loaded retention point is required. The pull ring with a 1.26-inch ring diameter allows for easy manual retraction without tools, making it practical in high-cycle or operator-facing applications.

Key Features

• Locking pull ring mechanism holds plunger retracted until manually released
• Initial end force of 2.5 pounds with final end force of 5 pounds for consistent retention
• 1/2-13 UNC thread size with 1.4-inch thread length for standard tapped-hole installation
• Plunger diameter of 0.312 inches and 0.5-inch projection for precise locating
• Steel construction for durability in industrial and production environments
• Pull ring diameter of 1.26 inches enables easy finger-pull retraction

Compatibility

Designed for installation in any application with a standard 1/2-13 UNC tapped hole requiring a spring-loaded locking plunger with pull ring retention.

Installation Notes

Installation is performed by threading the PR500P into a prepared 1/2-13 UNC tapped hole by hand or with an appropriate wrench on the hex head. Ensure the mating hole is clean and free of debris before installation. De-energize or lock out any powered equipment before servicing assemblies that incorporate spring plungers. Do not over-torque the body, as this may affect the locking element function or plunger travel.