Vlier PRSN250AP Pull Ring Spring Plunger 1/4-20

Product Description

The VLIER PRSN250AP is a steel pull ring spring plunger designed for precise, repeatable positioning and indexing in mechanical assemblies. The unit features a 1/4-20 thread size with a 0.31 inch thread length, a 0.16 inch plunger diameter, and a 0.19 inch plunger projection. End force ranges from 0.5 pounds initial to 2 pounds final, providing controlled resistance suited for light-duty detent and retention applications. The pull ring design allows the plunger to be manually retracted without tools, making it well suited for frequently accessed assemblies. Machinists, toolmakers, and mechanical assembly technicians are the primary installers.

This spring plunger is used in jigs, fixtures, tooling plates, machine tool components, and industrial equipment where a non-locking, manually retractable plunger is needed. The 1/4-20 threaded body installs into a tapped hole in steel, aluminum, or similar structural materials. Its compact body length of 0.44 inches and 0.18 inch head height make it appropriate for space-constrained assemblies. The locking element feature helps secure the plunger body in the threaded bore once positioned.

Key Features

• Pull ring design allows manual plunger retraction without additional tooling
• Non-locking plunger type for smooth, repeatable engagement and release
• End force range of 0.5 to 2 pounds suits light-duty detent and indexing applications
• Locking element secures the plunger body within the tapped bore
• Steel construction for durability in industrial and tooling environments
• Compact 0.44 inch body length fits tight assembly spaces

Compatibility

Designed as an OEM-style replacement or direct-fit component for mechanical assemblies, jigs, fixtures, and tooling plates requiring a 1/4-20 threaded spring plunger with a pull ring retraction mechanism.

Installation Notes

Installation is performed by machinists or mechanical assembly technicians using a 0.25 inch hex wrench to thread the body into a properly tapped 1/4-20 hole. Ensure the receiving bore is clean and threaded to the correct depth before installation. Do not overtighten the plunger body, as this may damage the locking element or distort the thread engagement. Confirm plunger projection and end force meet assembly requirements before finalizing installation.