Vlier SSMD59 Threaded Spring Plunger 3/8-16 Stubby

Product Description

The VLIER SSMD59 is a stubby-style threaded spring plunger designed for precision positioning, indexing, and light-duty holding applications in mechanical assemblies. The body is machined from stainless steel and accepts a 3/8-16 thread, making it straightforward to install in a tapped hole using standard hand tools. The plunger nose is Delrin, which provides low friction and wear resistance against mating surfaces. Initial end force is 1.5 pounds, with a final end force of 5 pounds, giving technicians a predictable and repeatable engagement feel. Thread length and body length are each 0.625 inches, keeping the installed footprint compact for tight-clearance designs.

This plunger fits residential and commercial mechanical, industrial, and manufacturing assembly applications where positive, spring-loaded detent action is needed without a locking element. The stubby plunger projection of 0.11 inches and a maximum plunger diameter of 0.186 inches suit designs with minimal clearance between mating components. Machinists, maintenance technicians, and mechanical assemblers typically install this part when a light, consistent detent or positioning stop is required in a tapped hole location.

Key Features

• Stainless steel body for corrosion resistance in demanding environments
• Delrin nose reduces friction and protects mating surfaces from galling
• 3/8-16 thread size allows installation with standard taps and tooling
• Stubby profile with 0.11 inches projection suited for tight-clearance assemblies
• 1.5 pound initial end force and 5 pound final end force for consistent detent feel
• No locking element simplifies removal and repositioning during assembly

Compatibility

Designed as an OEM-style threaded spring plunger for any assembly or fixture with a 3/8-16 tapped hole requiring a stubby spring detent with low-to-moderate end force.

Installation Notes

Installation is performed by threading the SSMD59 into a properly tapped 3/8-16 hole using a hex key or appropriate driver on the body. Ensure the mating hole is clean and free of debris before installation. Do not overtighten, as excessive torque can distort the stainless steel body or restrict plunger travel. Verify plunger projection and force requirements against the assembly specification before final seating.