Vlier PH57 Threaded Spring Plunger 5/16-18 Steel

Product Description

The VLIER PH57 is a standard threaded spring plunger designed to provide controlled, repeatable axial force in tooling, fixturing, and mechanical assembly applications. The steel body and steel nose deliver durability in demanding industrial environments. The plunger runs on a 5/16-18 thread with a 1-inch thread length, delivering an initial end force of 1.5 pounds and a final end force of 4.5 pounds, with a middle end force of 3 pounds. This part is installed by machinists, toolmakers, and mechanical assemblers working with jigs, fixtures, and positioning mechanisms.

The PH57 is suited for use in precision fixturing, indexing mechanisms, and detent applications where a compact, threaded retention or positioning element is required. The 3/16-inch plunger projection and 0.135-inch maximum plunger diameter make it compatible with tight-clearance installations in light industrial and machine shop settings. No locking element is incorporated, making installation and removal straightforward in standard threaded holes.

Key Features

• 5/16-18 thread size with 1-inch thread length for secure mounting in standard threaded bores
• 1.5 pound initial end force and 4.5 pound final end force for consistent spring-loaded positioning
• 3/16-inch plunger projection suitable for compact detent and indexing applications
• Steel body and steel nose for durability in industrial tooling environments
• No locking element for straightforward installation and field adjustment
• Standard plunger length type for conventional fixturing configurations

Compatibility

Designed as an OEM-style replacement or direct-fit component for standard 5/16-18 threaded spring plunger applications in industrial fixturing, jigs, and indexing assemblies.

Installation Notes

Installation is performed by machinists or mechanical assemblers using a hex key sized to the 0.093-inch hex drive. Ensure the receiving threaded bore is clean and free of debris before installation. De-energize or lock out any associated powered equipment before servicing spring plunger assemblies in active fixtures. Do not exceed the rated end force limits by forcing the plunger beyond its designed projection range.