Vlier PFP57 Press Fit Spring Plunger 3/8 Inch Steel

Product Description

The VLIER PFP57 is a press fit spring plunger designed for light end force applications in precision assemblies and industrial mechanisms. The steel body measures 0.375 inches in diameter and 0.786 inches in length, with a flanged design that seats flush against the housing surface during installation. The spring delivers 2.5 pounds of initial end force and 7 pounds of final end force, making it suited for indexing, positioning, and detent functions where consistent, repeatable engagement is required. The plunger nose diameter is 0.234 inches with a total plunger length of 0.882 inches.

This spring plunger is used in light-duty positioning and retention applications across industrial manufacturing, tooling fixtures, and precision mechanical assemblies. The press fit installation method eliminates the need for threaded bores, making it a practical choice in thin-wall or close-tolerance housings where thread cutting is not feasible. Installation is performed by pressing the body directly into a drilled hole sized to the specified body diameter.

Key Features

• Press fit body installs into a plain drilled hole - no tapping required
• Steel body and nose construction for durability in industrial environments
• 2.5 pounds initial to 7 pounds final end force for light detent and positioning duty
• Flanged design with 0.5 inch flange diameter and 0.096 inch flange thickness for positive seating
• Compact form factor: 0.375 inch body diameter, 0.786 inch body length
• No locking element - standard spring plunger configuration

Compatibility

Designed as an OEM-style press fit spring plunger for light end force applications in precision fixtures, tooling, and mechanical assemblies where a 0.375 inch bore diameter is present.

Installation Notes

Installation is performed by a machinist or assembly technician using a press or arbor press to drive the plunger body into a properly sized drilled hole. The bore should be machined to the appropriate interference fit tolerance for the 0.375 inch body diameter before pressing. Ensure the mating assembly is fully powered down and de-energized if installed in automated equipment before servicing. Do not exceed the press force required to seat the flange flush, as overdriving may deform the housing bore.