Vlier SSMD55N Threaded Spring Plunger 1/4-20 Stainless Steel

Product Description

The VLIER SSMD55N is a stubby threaded spring plunger designed for precise, repeatable positioning and light-duty indexing applications in mechanical assemblies. The body is manufactured from stainless steel, and the nose is Delrin for low-friction contact against mating surfaces. Thread size is 1/4-20 with a body and thread length of 0.531 inches. The plunger diameter measures 0.119 inches with a projection of 0.078 inches. Initial end force is 1 pound and final end force is 3.5 pounds. A locking element is incorporated into the body to secure the plunger once it is set to the desired position. This part is installed by machinists, maintenance technicians, and mechanical assemblers.

The SSMD55N is suited for use in jigs, fixtures, tooling plates, machine assemblies, and similar precision mechanical setups where a compact, low-profile spring plunger is required. The stubby body length makes it a practical choice when thread engagement depth is limited. The stainless steel body offers corrosion resistance suitable for washdown or light chemical environments. The Delrin nose reduces marring on soft or finished mating surfaces.

Key Features

• Stainless steel body for corrosion resistance in demanding environments
• Delrin nose material minimizes surface damage on mating components
• Locking element secures plunger position after installation and adjustment
• Stubby body profile fits shallow threaded holes and space-constrained assemblies
• 1/4-20 thread for broad compatibility with standard tapped hole patterns
• 1 pound initial and 3.5 pound final end force for light-duty positioning

Compatibility

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

Installation Notes

Installation is performed by hand or with a hex key or slotted driver, depending on the drive style of the plunger body. Ensure the mating tapped hole is clean and free of debris before threading in the plunger. The locking element should be engaged after the plunger is set to the correct projection depth. Do not overtighten, as stainless steel fasteners are susceptible to galling in threaded holes.