Vlier PFP54 Press Fit Spring Plunger 0.25 in Steel

Product Description

The VLIER PFP54 is a press fit spring plunger designed for light end force applications in precision positioning, indexing, and detent functions. The steel body measures 0.521 inches in length with a 0.25 inch diameter, allowing it to be pressed directly into a drilled or reamed hole without threading. The spring-loaded steel nose delivers an initial end force of 2.5 pounds, ramping to a final end force of 6 pounds, making it suitable for light-duty retention and tactile positioning tasks. Machinists, tool and die technicians, and mechanical assemblers install this type of plunger in fixtures, jigs, and mechanical assemblies where repeatable, low-force detent action is required.

The PFP54 is suited for use in light industrial and precision mechanical applications where a compact, flush-mount spring plunger is needed. Typical installations include fixture plates, tooling blocks, sliding panels, and mechanical indexing mechanisms. The press fit design eliminates the need for threaded bores, simplifying installation in thin-wall housings or close-tolerance assemblies. This plunger is appropriate for applications where the load forces are light and controlled positioning feedback is the primary requirement.

Key Features

• Press fit body installs into a drilled or reamed hole - no threading required
• Steel body and steel nose for durability in industrial fixture and tooling use
• Initial end force of 2.5 pounds with a final end force of 6 pounds for consistent light detent action
• Compact 0.521 inch body length fits tight-clearance assemblies
• Flange diameter of 0.312 inches and flange thickness of 0.055 inches provide a positive seating surface
• No locking element - straightforward spring plunger action for easy serviceability

Compatibility

Designed as a standard press fit spring plunger for light end force applications in precision tooling, fixture, and mechanical indexing assemblies requiring a 0.25 inch body diameter bore.

Installation Notes

Installation is performed by machinists or mechanical assemblers using a press or arbor press to seat the body into a properly sized drilled or reamed hole. Ensure the bore diameter matches the body diameter closely to achieve the correct interference fit and prevent rotation or pullout. De-energize and lock out any powered equipment before servicing assemblies containing this plunger. Do not hammer the plunger directly without a proper seating tool, as this may damage the flange or distort the body.