Vlier H55 Threaded Spring Plunger 1/4-20 Steel Body

Product Description

The VLIER H55 is a threaded spring plunger designed to provide controlled, repeatable positioning and indexing force in mechanical assemblies. It features a 1/4-20 thread size with a 1 inch thread length and a standard plunger projection of 3/16 inch. The steel body and steel nose deliver durable performance in light industrial and precision mechanical applications. Initial end force is 1 pound, with a final end force of 4 pounds, making it well suited for low-to-moderate detent and locating functions. Installation is performed by machinists, toolmakers, and mechanical assembly technicians.

The H55 is used in tooling fixtures, jigs, machine assemblies, and positioning mechanisms where repeatable spring-loaded engagement is required. Its compact 1/4-20 threaded body allows it to be installed in standard tapped holes across a wide range of workholding and indexing applications. The 1/8 inch hex drive size accommodates installation with standard hex wrenches. No locking element is present, which simplifies installation and removal in applications where thread-locking compounds or staking are not required.

Key Features

• 1/4-20 thread size with 1 inch thread length for standard tapped-hole installation
• Standard plunger projection of 3/16 inch with a nose radius of 0.071 inch
• Initial end force of 1 pound, middle end force of 2.5 pounds, and final end force of 4 pounds
• Steel body and steel nose construction for durability in industrial environments
• 1/8 inch hex drive for easy installation and removal with common hand tools
• No locking element for straightforward threaded installation

Compatibility

Designed as a standard threaded spring plunger for use in tapped holes sized for 1/4-20 threads in tooling fixtures, jigs, and mechanical positioning assemblies.

Installation Notes

Installation is performed by threading the H55 into a properly tapped 1/4-20 hole using a 1/8 inch hex wrench. Ensure the mating assembly is de-energized and stationary before installation or removal. Apply thread-locking compound if retention under vibration is required, as the H55 does not include an internal locking element. Avoid overtightening, which can damage the spring mechanism or thread engagement.