Vlier H54N Threaded Spring Plunger 1/4-20 Steel Locking

Product Description

The VLIER H54N is a threaded spring plunger designed for use in positioning, indexing, and light-duty detent applications across mechanical assemblies and fixtures. The H54N features a 1/4-20 thread with a 1 inch thread length and a 3/16 inch plunger projection. It delivers 3 pounds of initial end force, an 8 pound middle end force, and a 13 pound final end force, making it well-suited for applications that require controlled resistance and repeatable positioning. The steel body and steel nose provide durability in industrial environments. A built-in locking element secures the plunger in place once installed, preventing back-out under vibration or repeated cycling.

The VLIER H54N is used in machine tool fixtures, jigs, production tooling, and general mechanical assemblies where a reliable spring-loaded detent or positioning stop is needed. It is installed by machinists, tool and die makers, and maintenance technicians working with threaded bores in steel, aluminum, or similar materials. The standard plunger length type and compact 1/8 inch hex drive make it straightforward to install in confined clearance locations.

Key Features

• 1/4-20 thread with 1 inch thread length for standard tapped-hole installation
• 3/16 inch plunger projection with a nose radius of 0.071 inches for precise detent engagement
• Initial end force of 3 pounds, middle end force of 8 pounds, and final end force of 13 pounds
• Steel body and steel nose construction for durability in industrial service
• Integrated locking element resists back-out under vibration or repeated actuation
• 1/8 inch hex drive allows installation and adjustment in tight clearance locations

Compatibility

Designed as a direct-fit threaded spring plunger for applications using a standard 1/4-20 tapped hole, including machine tool fixtures, jigs, and mechanical assemblies requiring a spring-loaded detent or positioning element.

Installation Notes

Install into a properly tapped 1/4-20 threaded bore using a 1/8 inch hex key. Ensure the mating bore is clean and free of debris before threading in the plunger. Tighten until the locking element engages to prevent back-out during service. De-energize or lock out any associated machinery before installing or removing spring plungers in live fixtures.