Vlier S55 Threaded Spring Plunger 1/4-20 Steel

Product Description

The VLIER S55 is a threaded spring plunger designed to provide controlled positioning, indexing, or light-duty retention in mechanical assemblies. The S55 features a 1/4-20 thread with a 1 inch thread length and a standard-length steel body measuring 1 inch. The steel nose projects 3/16 inches and ranges from 0.117 to 0.118 inches in diameter. Initial end force is 1 pound, with a final end force of 4 pounds, making this plunger well suited for light indexing loads. Machinists, toolmakers, and mechanical assembly technicians are the primary installers of this component.

The S55 is used in jigs, fixtures, machine tool assemblies, and precision mechanical devices where a repeatable, spring-loaded detent or positioning stop is required. It threads directly into a tapped hole, eliminating the need for a separate housing. This makes it a compact solution for applications with limited space. Both the body and nose are steel, providing durability in industrial environments where contact wear is a concern.

Key Features

• 1/4-20 threaded body with 1 inch thread length for direct installation into tapped holes
• Steel body and steel nose for wear resistance in industrial applications
• Standard plunger projection of 3/16 inches
• 1 pound initial end force and 4 pound final end force for light indexing duty
• Plunger diameter range of 0.117 to 0.118 inches for consistent engagement
• No locking element, allowing straightforward installation and removal with standard tooling

Compatibility

Designed as an OEM-style replacement or direct-fit component for mechanical assemblies requiring a standard 1/4-20 threaded spring plunger with a 1 inch body length.

Installation Notes

Installation is performed by machinists or mechanical assembly technicians using standard hand tools. The receiving hole must be tapped to 1/4-20 prior to installation. Ensure the tapped hole depth accommodates the full 1 inch thread length. De-energize or lock out any machinery before installing or servicing spring plungers in moving assemblies.