Vlier H57N Threaded Spring Plunger 5/16-18 Steel

Product Description

The VLIER H57N is a threaded spring plunger designed to provide controlled positioning and detent force in mechanical assemblies. Featuring a 5/16-18 thread size with a 1 inch thread length and a 3/16 inch nose projection, this plunger delivers 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. The body and nose are both constructed from steel, providing durability in demanding industrial and mechanical applications. A locking element is incorporated into the design to secure the plunger's position once installed, preventing loosening under vibration or repeated cycling.

The H57N is suited for use in jigs, fixtures, tooling, machine components, and precision positioning assemblies where repeatable detent action is required. The standard plunger length configuration and compact 1/8 inch hex drive make it practical for installations in tight spaces. This part is typically installed by machinists, toolmakers, maintenance technicians, and mechanical assemblers working with production equipment, fixtures, or automated machinery.

Key Features

• 5/16-18 thread size with 1 inch thread length for secure installation in standard tapped holes
• 3/16 inch nose projection provides consistent detent engagement depth
• Initial end force of 1.5 lb and final end force of 4.5 lb for controlled positioning resistance
• Steel body and steel nose construction for strength and wear resistance
• Integrated locking element prevents backing out under vibration
• 1/8 inch hex drive allows installation and adjustment with standard hex key tooling

Compatibility

Designed as an OEM-style replacement or direct-install threaded spring plunger for mechanical assemblies, jigs, fixtures, and positioning applications requiring a 5/16-18 threaded body with standard plunger length configuration.

Installation Notes

Installation is performed by threading the H57N into a properly tapped 5/16-18 hole using a 1/8 inch hex key. De-energize and lock out any equipment before installing or servicing plungers in live machinery. The locking element should be engaged after final positioning to prevent rotation during operation. Do not overtighten, as excessive torque can deform the locking element or restrict plunger travel.