Vlier SSPH54AN Threaded Spring Plunger 1/4-28 Ss

Product Description

The VLIER SSPH54AN is a threaded spring plunger designed for precision positioning, indexing, and light-duty holding applications in industrial assemblies. Built with a stainless steel body and stainless steel nose, this standard-length plunger features a 1/4-28 thread and a 1 inch thread length for secure installation in threaded bores. The locking element prevents the plunger from backing out under vibration or repeated cycling. Initial end force is 3 pounds, middle end force is 8 pounds, and final end force is 13 pounds, giving installers a predictable force progression across the full travel range.

This spring plunger is suited for use in machine tooling fixtures, jigs, automated assembly equipment, and precision mechanical components where controlled detent force and repeatable positioning are required. It is typically installed by machinists, tool and die makers, and mechanical assembly technicians in both light manufacturing and precision industrial environments.

Key Features

• Stainless steel body and nose for corrosion resistance in demanding environments
• Locking element prevents back-out under vibration and repeated load cycles
• 1/4-28 thread with 1 inch thread length for broad fixture compatibility
• Plunger projection of 3/16 inch for controlled detent engagement depth
• Progressive force range: 3 pounds initial, 8 pounds middle, 13 pounds final end force
• Standard plunger length type for drop-in replacement in existing threaded bores

Compatibility

Designed as a direct-fit threaded spring plunger for applications requiring a 1/4-28 threaded bore and a standard-length stainless steel plunger body with a locking element feature.

Installation Notes

Installation is performed by threading the plunger into a prepared 1/4-28 tapped bore using the hex drive feature; a hex key or ball-end driver of the appropriate size is required. Disengage or lock out any powered or spring-loaded mechanisms in the assembly before installing or removing the plunger. Do not over-torque the body, as this can damage the locking element or distort the bore threads. Verify plunger projection clearance against mating components before finalizing the installation.