Vlier B54N Threaded Ball Plunger 1/4-20 Steel

Product Description

The VLIER B54N is a threaded ball plunger designed for controlled end-force applications in precision mechanical assemblies. It features a 1/4-20 thread, a 0.125 inch steel ball diameter, and a 0.531 inch body length with a maximum ball reach of 0.035 inches. The steel body and steel ball provide durability in demanding positioning and detent applications. A locking element is incorporated into the design to secure the plunger after installation, preventing loosening under vibration. With an initial end force of 3 pounds and a final end force of 7 pounds, this plunger delivers consistent, repeatable force across its range of travel. It is one of the smallest and lightest spring-loaded devices available in this thread class.

The VLIER B54N is suited for use in fixtures, jigs, tooling plates, machine slides, and other mechanical assemblies where controlled detent or positioning force is required. Its compact form factor makes it a practical choice when space is limited and precise spring force must be maintained. Machinists, toolmakers, and mechanical assemblers typically install this type of plunger in industrial and manufacturing environments where repeatable part positioning is critical.

Key Features

• 1/4-20 thread size for straightforward installation in tapped holes
• Steel body and steel ball for durability in industrial applications
• Locking element prevents loosening after installation
• Initial end force of 3 pounds and final end force of 7 pounds for controlled detent performance
• Maximum ball reach of 0.035 inches for precise positional engagement
• Compact design identified as one of the smallest and lightest spring-loaded devices in its class
• Purple color code for quick identification during assembly

Compatibility

Designed as an OEM-style replacement or direct-install threaded ball plunger for mechanical assemblies, fixtures, and tooling that require a 1/4-20 threaded spring-loaded detent device.

Installation Notes

Installation requires a tapped 1/4-20 hole in the mating component. Disengage or de-energize any powered equipment before installing or servicing components in the assembly. Use appropriate hand tools to thread the plunger body in and tighten the locking element to secure it in place. Avoid over-torquing, which can damage the thread or compress the spring mechanism beyond its rated travel.