Vlier SSMD61N Threaded Spring Plunger 1/2-13 Stubby

Product Description

The VLIER SSMD61N is a stubby threaded spring plunger designed for indexing, positioning, and light-duty holding applications in mechanical assemblies. It features a 1/2-13 thread with a 0.75 inch thread length and a maximum plunger diameter of 0.248 inches. The plunger projection is 0.151 inches, providing a low-profile engagement stroke suited for compact tooling, fixtures, and machine components. The stainless steel body offers corrosion resistance in demanding shop and industrial environments. A built-in locking element secures the plunger in the threaded bore after installation, preventing back-out under vibration. Machinists, toolmakers, and mechanical assemblers typically install this component in production fixtures, jigs, and precision positioning systems.

This spring plunger suits residential and industrial tooling applications where controlled, repeatable detent force is required. It is threaded directly into a tapped hole and relies on spring force alone to engage a mating surface or detent. With an initial end force of 1.75 pounds and a final end force of 5.5 pounds, it delivers a defined force range appropriate for light indexing and part-retention tasks. The Delrin nose minimizes wear on mating surfaces and reduces friction during engagement. The stubby body length of 0.75 inches makes it suitable for installations with limited depth clearance.

Key Features

• Stubby profile with 0.75 inch body length for shallow-bore installations
• 1/2-13 thread size for straightforward installation in standard tapped holes
• Stainless steel body for corrosion resistance in wet or harsh environments
• Delrin nose reduces friction and protects mating contact surfaces
• Locking element prevents back-out under vibration without adhesives
• Defined spring force range: 1.75 pounds initial to 5.5 pounds final end force

Compatibility

Designed as an OEM-style replacement or direct installation component for mechanical fixtures, jigs, and positioning assemblies requiring a 1/2-13 threaded spring plunger with a stubby body profile.

Installation Notes

Installation requires a properly tapped 1/2-13 threaded hole with sufficient depth to accept the 0.75 inch body length. Use an appropriate hex key or spanner tool to thread the plunger into the bore and engage the locking element fully. Ensure the mating bore is free of chips and debris before installation to avoid damaging the Delrin nose or misaligning the plunger. De-energize or secure any associated machinery before servicing fixtures or assemblies that contain this component.