Vlier S54AN Threaded Spring Plunger 1/4-28 Steel Locking

Product Description

The VLIER S54AN is a threaded spring plunger designed for precise positioning, indexing, and detent applications in mechanical assemblies. It features a 1/4-28 thread with a 1 inch thread length and a steel body with a steel nose. The plunger delivers 3 pounds of initial end force and 13 pounds of final end force, providing consistent, controlled resistance. A built-in locking element secures the plunger in place once installed, preventing loosening from vibration or movement. Machinists, toolmakers, and mechanical assembly technicians install this type of component in fixtures, jigs, and precision equipment.

The S54AN is suited for use in light to medium-duty positioning and holding applications across industrial, manufacturing, and tooling environments. Its standard plunger length and compact 3/16 inch projection make it appropriate for installations where space is limited and controlled spring force is required. This plunger is installed in threaded holes in metal fixtures, machine housings, and assembly tooling where repeatable detent action is needed.

Key Features

• 1/4-28 thread size with 1 inch thread length for standard tapped-hole installations
• 3/16 inch plunger projection provides controlled, repeatable detent action
• 3 pounds initial end force and 13 pounds final end force for medium holding strength
• Steel body and steel nose for durability in industrial environments
• Locking element prevents back-out under vibration or repeated cycling
• Standard plunger length type for straightforward replacement or new installation

Compatibility

Designed as an OEM-style replacement or new installation for threaded spring plunger applications requiring a 1/4-28 thread size and standard plunger length in steel-body configurations.

Installation Notes

Installation is performed by threading the plunger into a pre-tapped 1/4-28 hole using an appropriate driver or wrench on the body hex. Ensure the mating bore or receiving surface is clean and free of debris before installation. The locking element engages as the plunger is seated, so do not over-torque beyond hand-tight-plus-snug without confirming the installation depth specified for the application. De-energize or lock out any powered equipment before servicing assemblies containing spring plungers.