Vlier M55 Threaded Spring Plunger 1/4-20 Steel

Product Description

The VLIER M55 is a stubby threaded spring plunger designed for precision positioning, indexing, and light-duty detention applications in restricted-space installations. The plunger body and nose are both constructed from steel, providing durability in demanding mechanical assemblies. It features a 1/4-20 thread with a thread length of 0.531 inches and a maximum plunger diameter of 0.119 inches. The plunger projection measures 0.078 inches, with an initial end force of 1 pound and a final end force of 3.5 pounds. This part is typically installed by machine builders, tool and die technicians, and maintenance mechanics working on precision mechanical fixtures and assemblies.

The M55 is suited for applications requiring high end force in confined or restricted spaces. Its stubby form factor makes it appropriate for use in tight assemblies where standard-length plungers cannot be accommodated. Typical use cases include jig and fixture positioning, panel latching, and component retention in industrial machinery and mechanical assemblies. The absence of a locking element allows for straightforward installation and removal without additional tooling for the plunger element itself.

Key Features

• Stubby plunger length type suited for restricted-space installations
• 1/4-20 thread for compatibility with standard tapped holes
• Steel body and nose construction for durability in mechanical assemblies
• 1 pound initial end force and 3.5 pound final end force for reliable positioning and detention
• 0.078 inch plunger projection minimizes protrusion in compact assemblies
• No locking element for straightforward installation and serviceability

Compatibility

Designed as an OEM-style replacement or direct-fit component for mechanical assemblies, jigs, fixtures, and machinery requiring a 1/4-20 threaded spring plunger with a stubby body profile and high end force rating.

Installation Notes

Installation is typically performed by machine builders or maintenance mechanics using a standard hex wrench or screwdriver appropriate for the drive type. Ensure the receiving tapped hole meets the 1/4-20 thread specification and is free of debris before installation. De-energize or lock out any machinery before servicing plungers located in moving or load-bearing assemblies. Do not exceed the rated final end force to avoid premature spring fatigue.