Vlier PH54A Threaded Spring Plunger 1/4-28 Steel

Product Description

The VLIER PH54A is a standard threaded spring plunger designed to provide controlled, repeatable end force in positioning, indexing, and locking applications. It features a 1/4-28 thread with a 1 inch thread length and a 0.118 inch maximum plunger diameter with a 3/16 inch projection. The steel body and steel nose deliver consistent performance in moderate-duty industrial and mechanical assemblies. Initial end force is 3 pounds, with a midpoint force of 8 pounds and a final end force of 13 pounds, making it well suited for applications requiring progressive resistance through the plunger stroke. Machinists, toolmakers, and maintenance technicians are the primary installers of this type of component.

The PH54A is used in jigs, fixtures, machine tool components, and assembly tooling where a threaded plunger is needed to locate, retain, or lightly index a workpiece or moving part. It installs directly into a tapped 1/4-28 through-hole or blind hole. The standard plunger length type makes it a straightforward fit in most off-the-shelf tooling plate and fixture block applications. No locking element is incorporated, so the plunger can be adjusted or removed with a hex key at the hex flat sized to 0.079 inches.

Key Features

• 1/4-28 thread with 1 inch thread length for standard tapped-hole installation
• 3/16 inch plunger projection with a stroke-progressive force range of 3 to 13 pounds
• Steel body and steel nose for durability in industrial tooling environments
• No locking element - adjustable positioning without thread-locking compound required
• 0.079 inch hex flat allows installation and removal with a standard hex key
• Standard plunger length type for broad compatibility with common fixture and jig configurations

Compatibility

Designed as an OEM-style replacement or direct-fit component for standard 1/4-28 tapped-hole spring plunger applications in industrial jigs, fixtures, and machine tool assemblies.

Installation Notes

Installation is performed by machinists or maintenance technicians using a hex key sized for the 0.079 inch hex flat. Ensure the receiving hole is tapped to 1/4-28 and is clean and free of debris before threading in the plunger. Do not overtighten, as this can distort the body or affect plunger travel. No power source or lockout procedure is required for mechanical spring plunger installation.