Vlier PR250P Locking Pull Ring Spring Plunger 1/4-20 Steel

Product Description

The VLIER PR250P is a locking pull ring spring plunger designed for precision indexing and positioning applications in industrial assemblies. The plunger features a 1/4-20 thread and a 0.155 inch plunger diameter with a 0.25 inch projection, delivering an initial end force of 1 pound and a final end force of 2.5 pounds. A pull ring locking element holds the plunger in the retracted position, preventing unintended engagement during setup or repositioning. The all-steel construction provides durability in demanding shop and machine environments. Maintenance technicians, machine builders, and tooling professionals typically install and service this style of component.

The PR250P is suited for use in jigs, fixtures, machine tools, and assembly tooling where controlled spring-loaded positioning is required. The locking pull ring design is particularly useful in applications where the plunger must remain retracted while a workpiece or component is loaded. The 1/4-20 thread allows installation into standard tapped holes found across a wide range of industrial equipment and tooling setups.

Key Features

• Locking pull ring holds plunger retracted for hands-free workpiece loading
• 1/4-20 thread size fits standard tapped holes in tooling and fixtures
• Initial end force of 1 pound graduating to 2.5 pounds final end force
• 0.155 inch plunger diameter with 0.25 inch projection
• All-steel construction for durability in industrial environments
• Compact body length of 1.14 inches suits space-constrained assemblies

Compatibility

Designed as an OEM-style replacement or direct-install locking spring plunger for industrial jigs, fixtures, and machine tooling applications requiring a 1/4-20 threaded spring plunger with a locking pull ring.

Installation Notes

Installation requires a properly tapped 1/4-20 hole in the receiving body. Thread the plunger in by hand first, then use appropriate tooling on the head to achieve the desired seating depth. Power down and de-energize any associated equipment before servicing components in an active assembly. Do not overtighten, as this can deform the thread or alter spring force performance.