Vlier PRSN250 Pull Ring Plunger 1/4-20 Steel

Product Description

The VLIER PRSN250 is a steel pull ring plunger designed for indexing, positioning, and detent applications in industrial assemblies. This non-locking spring plunger threads into a tapped hole using a 1/4-20 thread and delivers an initial end force of 0.5 pounds rising to a final end force of 2 pounds. The pull ring allows manual retraction of the plunger without additional tooling, making it well suited for applications requiring frequent adjustment or quick-release positioning. Machinists, maintenance technicians, and mechanical assemblers install this type of component in fixtures, jigs, slides, and panel assemblies.

The PRSN250 is used in light-duty mechanical positioning systems where a retractable plunger must engage a detent hole or groove. Typical install scenarios include machine tool fixtures, sliding drawer mechanisms, panel latches, and tooling plates. The pull ring allows the operator to retract the plunger by hand, making it appropriate for assemblies that cycle frequently without tools. This plunger is suited for both production equipment and maintenance tooling in industrial and commercial settings.

Key Features

• Pull ring allows hand retraction without tools for fast, repeated indexing
• Non-locking plunger design for free spring-return engagement
• 1/4-20 thread for installation in standard tapped holes
• Steel construction for durability in industrial environments
• Initial end force of 0.5 pounds and final end force of 2 pounds for light-duty detent holding
• Compact body length of 0.44 inches fits tight-clearance assemblies

Compatibility

Designed as an OEM-style replacement or direct-fit component for assemblies requiring a 1/4-20 threaded non-locking pull ring spring plunger with a 0.16-inch plunger diameter.

Installation Notes

Installation requires a clean, properly tapped 1/4-20 through or blind hole in the mating component. Use an appropriate hex wrench sized for the 0.25-inch hex drive to thread the plunger body to the correct depth. Ensure the assembly is de-energized and any moving components are secured before installing or removing plungers in active equipment. Do not exceed the rated end force by over-compressing the plunger, as this can damage the spring or plunger tip.