Vlier PRSN250A Pull Ring Plunger 1/4-20 Steel

Product Description

The VLIER PRSN250A is a steel pull ring spring plunger with a 1/4-20 thread size, designed for indexing, positioning, and light-duty locking applications in industrial and mechanical assemblies. The plunger operates with a non-locking action, providing an initial end force of 0.5 pounds and a final end force of 2 pounds, making it well-suited for applications that require consistent, repeatable detent action without permanent engagement. The pull ring allows manual retraction of the plunger without tools, which speeds up adjustment and changeover on fixtures, jigs, and assemblies. Machinists, toolmakers, and maintenance technicians are the typical installers.

This spring plunger fits into threaded holes and is commonly used in manufacturing fixtures, machine tool components, assembly jigs, and adjustable mechanical stops. The 1/4-20 thread is a standard size found across a wide range of light industrial equipment, making this a frequent replacement or retrofit component. Its compact body length of 0.44 inches and plunger projection of 0.19 inches suit applications where space is limited and precise detent travel is required.

Key Features

• Pull ring design allows tool-free manual plunger retraction
• Non-locking plunger action for smooth, repeatable indexing
• Initial end force of 0.5 pounds rising to a final end force of 2 pounds
• Standard 1/4-20 thread for broad compatibility with existing threaded bores
• Steel construction for durability in industrial environments
• Compact body at 0.44 inches length with a 0.19-inch plunger projection

Compatibility

Designed as an OEM-style replacement or new-installation spring plunger for threaded assemblies requiring a 1/4-20 non-locking pull ring plunger in steel.

Installation Notes

Installation is performed by threading the plunger body into a pre-tapped 1/4-20 hole using a 1/4-inch hex wrench applied to the hex drive on the head. Ensure the mating assembly is de-energized and stationary before installation or removal. Do not overtighten, as excessive torque can deform the plunger body or affect spring performance. Verify plunger projection clearance against the mating detent surface before finalizing installation.