Vlier NM54N Threaded Spring Plunger 1/4-20 Steel Locking

Product Description

The VLIER NM54N is a stubby threaded spring plunger designed to provide controlled, repeatable positioning and detent force in mechanical assemblies. Featuring a 1/4-20 thread with a 0.531-inch thread length, it delivers an initial end force of 3 pounds and a final end force of 10.5 pounds. The steel body offers durability in demanding industrial and manufacturing environments, while the Delrin nose reduces wear on mating surfaces. A built-in locking element secures the plunger in place after installation, preventing loosening from vibration. Machinists, toolmakers, and mechanical assembly technicians are the primary installers of this component.

This spring plunger is suited for use in jigs, fixtures, machine tools, and precision mechanical assemblies where consistent detent action or part positioning is required. The stubby body length of 0.531 inches makes it appropriate for applications with limited thread engagement depth. The 0.119-inch maximum plunger diameter and 0.078-inch projection are sized for light-duty detent and indexing functions in tight-clearance designs.

Key Features

• 1/4-20 thread size with 0.531-inch thread length for standard tapped-hole installation
• Initial end force of 3 pounds and final end force of 10.5 pounds for consistent detent action
• Steel body construction for strength and wear resistance
• Delrin nose material minimizes wear on contact surfaces
• Locking element prevents back-out under vibration
• Stubby plunger length suits shallow thread engagement applications

Compatibility

Designed as an OEM-style replacement or direct-install spring plunger for mechanical assemblies requiring a 1/4-20 threaded stubby spring plunger with a locking element.

Installation Notes

Installation is performed by machinists or mechanical assembly technicians using a standard hex key or spanner tool appropriate for the plunger body. Thread the plunger into a pre-tapped 1/4-20 hole, torquing only to manufacturer-specified values using calibrated tooling. De-energize or lock out any powered equipment before servicing assemblies containing spring plungers. Do not over-torque the body, as this can damage the locking element or distort the plunger bore.