Vlier SSM54N Threaded Spring Plunger 1/4-20 Stainless Steel

Product Description

The VLIER SSM54N is a stubby threaded spring plunger designed for precise positioning and locking in tight-clearance applications. Built with a stainless steel body and stainless steel nose, it threads into a 1/4-20 tapped hole and uses an internal spring mechanism to deliver controlled end force. Initial end force is 3 pounds and final end force is 10.5 pounds, making it well suited for applications that demand firm, repeatable resistance. The overall body length is 0.531 inches with a maximum plunger diameter of 0.119 inches and a projection of 0.078 inches. A locking element is incorporated to prevent the plunger from backing out under vibration or repeated cycling.

This spring plunger is specified for high end force applications where installation space is restricted. The stubby form factor allows it to fit into shallow bores and confined assemblies that cannot accommodate standard-length plungers. Typical use cases include positioning detents, index stops, and retention mechanisms in industrial equipment, tooling fixtures, and precision mechanical assemblies. It is installed by qualified machinists, tool and die makers, and mechanical technicians working with threaded inserts and positioning hardware.

Key Features

• Stubby plunger length type for use in restricted or shallow-clearance spaces
• 1/4-20 thread size with 0.531-inch thread length for straightforward installation into standard tapped holes
• 3-pound initial end force and 10.5-pound final end force for firm, high-resistance positioning
• Stainless steel body and nose material for corrosion resistance and durability
• Integrated locking element prevents back-out under vibration or cyclic loading
• Compact 0.119-inch maximum plunger diameter and 0.078-inch projection for minimal footprint

Compatibility

Designed for installation into standard 1/4-20 tapped holes in applications requiring high end force and restricted-space spring plunger hardware.

Installation Notes

Installation is performed by threading the SSM54N into a properly tapped 1/4-20 hole using an appropriate hex key or spanner tool sized for the plunger body. Ensure the mating assembly is de-energized and stationary before installation. Do not over-torque the body, as this can damage the locking element or distort the thread engagement. Verify plunger projection clearance against the mating surface before final assembly.