Vlier PFB59 Press Fit Ball Plunger 0.5 in Steel

Product Description

The VLIER PFB59 is a press fit ball plunger designed for positive positioning, indexing, and light detent applications in mechanical assemblies. The body is machined from steel with a black finish, and the spring-loaded ball is stainless steel. It presses directly into a drilled or reamed hole, eliminating the need for threading. The 0.5-inch body diameter and 1.1-inch body length make it a compact fit for tight assemblies. Initial end force is 4 pounds, and final end force is 9 pounds, providing a consistent, repeatable detent feel suited to tooling, fixtures, and precision mechanical hardware.

This ball plunger is used in industrial tooling, jigs, fixtures, and mechanical positioning systems where a simple, non-threaded installation is required. The flanged design seats flush against a mating surface, controlling insertion depth without additional hardware. It is typically installed by machinists, tool and die makers, or mechanical assemblers working with metal fabrication equipment, production fixtures, or precision assembly jigs. The black finish provides basic corrosion resistance for use in dry or lightly protected environments.

Key Features

• Press fit installation into a drilled or reamed hole - no threading required
• Stainless steel ball with 0.312-inch diameter and 0.161-inch maximum reach
• 4-pound initial end force and 9-pound final end force for repeatable detent action
• Flanged body controls insertion depth - flange diameter 0.688 inches, flange thickness 0.11 inches
• Steel body with black finish for durability in industrial environments
• Compact 0.5-inch body diameter and 1.1-inch length under flange suits tight assemblies

Compatibility

Designed as an OEM-style replacement or direct-fit component for mechanical assemblies, jigs, fixtures, and tooling that require a 0.5-inch press fit ball plunger with a flanged body.

Installation Notes

Installation is performed by pressing the plunger body into a precisely drilled or reamed hole sized to the 0.5-inch body diameter - an interference fit is required for secure retention. Use a press or arbor press rather than a hammer to avoid cocking the plunger in the bore. Verify hole depth allows the flange to seat fully against the mating surface before pressing. No power source or shutoff is required for installation of this mechanical component.