Vlier SSMD55 Threaded Spring Plunger 1/4-20 Stainless Steel

Product Description

The VLIER SSMD55 is a stubby-style threaded spring plunger designed for precise, repeatable positioning and light-duty detent applications in mechanical assemblies. It threads into a standard 1/4-20 tapped hole and delivers a 1-pound initial end force rising to 3.5 pounds final end force as the plunger compresses. The stainless steel body resists corrosion in demanding environments, while the Delrin nose provides a low-friction, non-marring contact surface. The overall body length and thread length are both 0.531 inches, keeping the installed footprint compact. Machinists, tool and die technicians, and assembly line engineers typically install and service this type of hardware.

This spring plunger suits precision mechanical assemblies where controlled detent force and minimal projection are required. The stubby form factor is suited for applications with limited axial clearance. With a maximum plunger diameter of 0.119 inches and a projection of 0.078 inches, it fits in densely packed fixtures, jigs, tooling plates, and light-duty indexing mechanisms. The non-locking design allows straightforward installation and removal without the need for thread-locking elements.

Key Features

• Stubby plunger style for use in tight axial-clearance applications
• Stainless steel body for corrosion resistance in harsh or washdown environments
• Delrin nose provides low-friction, non-marring contact against mating surfaces
• 1/4-20 thread for compatibility with standard tapped holes
• 1-pound initial end force and 3.5-pound final end force for light-duty detent control
• No locking element for straightforward installation and removal

Compatibility

Designed as an OEM-style replacement or direct-fit component for any assembly using a standard 1/4-20 threaded spring plunger in a stubby-length configuration.

Installation Notes

Installation requires a properly tapped 1/4-20 through or blind hole in the mating component. Thread the plunger in using an appropriate hex key or spanner and confirm the nose moves freely through its full stroke before final assembly. De-energize or depressurize any associated mechanism before servicing spring plungers seated in active assemblies. Avoid over-torquing, as stainless steel threads in aluminum or softer materials can gall.