Vlier S54BN Threaded Spring Plunger 1/4-20 Steel Body

Product Description

The VLIER S54BN is a threaded spring plunger designed for indexing, positioning, and light-duty holding applications in mechanical assemblies. It features a 1/4-20 thread with a 3/4-inch thread length and a steel body and nose. The plunger delivers 2 pounds of initial end force and 9 pounds of final end force, providing controlled resistance across its travel range. A locking element is included to secure the plunger in its installed position and prevent back-out under vibration. This part is typically installed by machine builders, tool and die technicians, and maintenance mechanics working on fixtures, jigs, and production equipment.

The S54BN is suited for use in metal fabrication fixtures, assembly tooling, and precision machinery where repeatable positioning is required. The 1/8-inch plunger projection keeps the plunger profile low, making it a practical choice for tight assemblies or close-tolerance fixtures. Its standard plunger length type and 3/4-inch body length allow it to fit in commonly tapped hole configurations without modification.

Key Features

• 1/4-20 thread size with 3/4-inch thread length for standard tapped hole fitment
• Steel body and nose for durability in industrial environments
• 2-pound initial end force and 9-pound final end force for controlled positioning
• 1/8-inch plunger projection for low-profile installations
• Locking element prevents back-out under vibration or repeated cycling
• Plunger diameter range of 0.117 to 0.118 inches for consistent engagement

Compatibility

Designed as a standard replacement or new-installation threaded spring plunger for fixtures, jigs, and mechanical assemblies requiring a 1/4-20 tapped hole and a low-projection steel plunger.

Installation Notes

Installation is typically performed by a machinist or maintenance mechanic using a hex wrench or installation tool appropriate for the 1/4-20 thread. Ensure the receiving hole is cleanly tapped and free of debris before threading in the plunger. The locking element should be engaged after the plunger is set to the correct depth to prevent loosening. De-energize or lock out any powered equipment before servicing assemblies that contain this component.