Vlier PH54N Threaded Spring Plunger 1/4-20 Steel Locking

Product Description

The VLIER PH54N is a threaded spring plunger designed for indexing, positioning, and light detent applications in mechanical assemblies. It features a 1/4-20 thread with a 1 inch thread length and a steel body with an integrated locking element to secure the plunger in place after installation. The plunger nose is also steel, with a minimum diameter of 0.117 inches and a maximum diameter of 0.118 inches, and delivers a 3/16 inch projection. Initial end force is 3 pounds, middle end force is 8 pounds, and final end force is 13 pounds, giving technicians a predictable force range across the plunger travel.

The PH54N is used in jigs, fixtures, tooling plates, and machine components where repeatable positioning or light locking is required. The 1/4-20 thread makes it compatible with standard tapped holes in steel, aluminum, and plastic assemblies. It is commonly installed by machinists, tool and die makers, and mechanical assembly technicians working in industrial and manufacturing environments. The locking element prevents the plunger from backing out under vibration or repeated actuation cycles.

Key Features

• 1/4-20 thread with 1 inch thread length for standard tapped-hole installation
• Steel body and steel nose for durability in industrial environments
• Integrated locking element prevents backing out under vibration
• 3/16 inch plunger projection with a force range from 3 pounds initial to 13 pounds final
• Standard plunger length type for straightforward drop-in replacement
• 0.079 inch hex size for precise installation torque control

Compatibility

Designed as an OEM-style replacement or direct-install spring plunger for any assembly using a standard 1/4-20 tapped hole requiring a steel-body spring plunger with locking element and 3/16 inch projection.

Installation Notes

Install using an appropriate hex key matched to the 0.079 inch hex drive. Thread the plunger into a clean, properly tapped 1/4-20 hole and tighten until the locking element engages. De-energize and lock out any powered equipment before servicing assemblies containing this plunger. Do not overtighten, as excessive torque can damage the locking element or distort the plunger body.