Vlier SSS55A Threaded Spring Plunger 1/4-28 Stainless Steel

Product Description

The VLIER SSS55A is a threaded spring plunger designed for precise, repeatable positioning and indexing applications in industrial and mechanical assemblies. Built with a stainless steel body and stainless steel nose, it threads into a tapped hole using a 1/4-28 thread and delivers controlled spring force through its projecting plunger tip. Initial end force is 1 pound, with a final end force of 4 pounds. The plunger diameter ranges from 0.117 to 0.118 inches with a 3/16 inch projection. This part is installed by machine builders, tool and die technicians, and maintenance machinists working on jigs, fixtures, and precision assemblies.

The SSS55A suits applications where repeatable detent action, light spring-loaded engagement, or component retention is needed without a locking element. It fits into any assembly accepting a 1/4-28 threaded hole with sufficient clearance for the 3/16 inch plunger projection. Common use cases include fixture plates, indexing mechanisms, sliding carriages, and panel assemblies in both light manufacturing and precision tooling environments. The all-stainless construction makes it appropriate for washdown-adjacent or corrosion-sensitive settings.

Key Features

• 1/4-28 thread for direct installation into standard tapped holes
• Stainless steel body and nose for corrosion resistance
• 1 pound initial end force and 4 pound final end force for light detent engagement
• 3/16 inch plunger projection with 0.117 to 0.118 inch plunger diameter
• Standard plunger length type with 1 inch body and thread length
• No locking element - thread engagement relies on installation torque

Compatibility

Designed as an OEM-style replacement or new-installation threaded spring plunger for any assembly requiring a 1/4-28 threaded spring plunger with a standard 1 inch thread length and 3/16 inch projection.

Installation Notes

Installation is performed by machinists or maintenance technicians using a hex key or appropriate drive tool suited to the plunger body. The receiving hole must be tapped to 1/4-28 before installation. Always ensure the assembly is de-energized and secured before servicing spring plungers in live machinery. Because this plunger has no locking element, apply appropriate thread-locking compound or torque to the manufacturer specification to prevent loosening under vibration.