Vlier PRSN250P Pull Ring Plunger 1/4-20 Steel

Product Description

The VLIER PRSN250P is a steel pull ring plunger designed for precision indexing, positioning, and locking applications in industrial and mechanical assemblies. The unit threads into a tapped hole using a 1/4-20 thread and deploys a spring-loaded plunger that engages a mating detent or recess to hold a component in position. The pull ring allows the operator to retract the plunger manually without tools. With an initial end force of 0.5 pounds and a final end force of 2 pounds, this plunger suits light-duty positioning tasks where repeatable, tool-free engagement is required. Installers and maintenance technicians encounter this type of hardware in jigs, fixtures, slides, and adjustable assemblies.

The PRSN250P is suited for use in precision mechanical assemblies across manufacturing, tooling, and equipment maintenance environments. The 1/4-20 thread makes it compatible with standard tapped holes in steel, aluminum, and similar substrates. It is a non-locking plunger, meaning the spring force alone provides retention without a secondary locking mechanism. This makes it appropriate for applications requiring quick, repeated adjustment rather than permanent or high-load retention. The pull ring enables single-hand plunger retraction, which is useful in confined or frequently accessed assemblies.

Key Features

• Pull ring design allows tool-free manual plunger retraction
• Non-locking plunger type for quick-release, repeated-adjustment applications
• 1/4-20 thread for installation into standard tapped holes
• Steel construction for durability in industrial environments
• Initial end force of 0.5 pounds, final end force of 2 pounds for light-duty positioning
• Locking element present for secure thread engagement in the body

Compatibility

Designed as an OEM-style replacement or direct-fit spring plunger for mechanical assemblies using a standard 1/4-20 tapped hole.

Installation Notes

Installation is performed by threading the PRSN250P into a pre-tapped 1/4-20 hole using a hex wrench sized for the 0.25-inch hex drive on the head. Ensure the mating assembly is powered down or de-energized and all moving components are secured before servicing plunger hardware. Do not over-torque the body, as this can damage the thread or affect plunger travel. Verify plunger projection and detent depth alignment before returning the assembly to service.