Vlier H59 Threaded Spring Plunger 3/8-16 Steel Body

Product Description

The VLIER H59 is a standard threaded spring plunger designed for indexing, positioning, and light-duty detention applications in mechanical assemblies. It features a 3/8-16 thread with a 1-1/8 inch thread length and a 3/16 inch nose projection. The steel body and steel nose provide solid durability in industrial environments. Initial end force is 2.8 pounds, final end force is 7.2 pounds, and middle end force is 5.0 pounds, giving technicians a predictable force curve across the full stroke. This plunger ships individually and is installed by machinists, tool and die makers, and maintenance technicians working on jigs, fixtures, and production tooling.

The H59 is suited for use in tapped holes in metal fixtures, machine frames, and precision assemblies where a spring-loaded nose is needed to hold a position or provide controlled resistance. The standard plunger length type makes it a straightforward drop-in for new builds and repair work alike. The 3/16 inch hex size allows installation and removal with common hex key tooling. No locking element is included, which keeps installation simple in applications where the plunger will not be subject to significant vibration-induced loosening.

Key Features

• 3/8-16 thread for direct installation into standard tapped holes
• 1-1/8 inch thread length provides ample engagement depth in typical fixture stock
• 3/16 inch nose projection with a 0.108 inch nose radius for smooth detent engagement
• 2.8 pound initial end force and 7.2 pound final end force for a predictable, progressive force curve
• Steel body and steel nose for durability in industrial tooling environments
• 3/16 inch hex size for installation with standard hex key tooling

Compatibility

Designed as an OEM-style replacement or new-installation spring plunger for mechanical fixtures, jigs, and assemblies requiring a standard 3/8-16 threaded spring plunger with a steel body.

Installation Notes

Install and remove using a 3/16 inch hex key. The receiving hole must be tapped to 3/8-16 specification and cleaned of chips and debris before installation. Power down or de-energize any associated machinery before servicing plunger positions in active fixtures. Apply thread-locking compound only if needed for vibration resistance, as no integral locking element is present on this model.