Vlier SSMD57N Threaded Spring Plunger 5/16-18 Stainless Steel

Product Description

The VLIER SSMD57N is a stubby threaded spring plunger designed for precise, repeatable positioning and light-duty locking in mechanical assemblies. It features a 5/16-18 thread with a 0.562-inch thread length and a maximum plunger diameter of 0.135 inches. The plunger delivers an initial end force of 1.25 pounds and a final end force of 4 pounds, making it well suited for applications that require controlled detent action. The stainless steel body provides corrosion resistance, and the Delrin nose reduces wear on mating surfaces. A locking element is included to secure the plunger in position once installed.

This spring plunger is used in indexing fixtures, tooling plates, machine guarding, and precision mechanical assemblies where consistent detent or positioning force is required. The stubby body length of 0.562 inches suits tight-clearance installations where a standard-length plunger would not fit. It is typically installed by machinists, tool-and-die makers, and maintenance technicians working on light mechanical assemblies and production fixtures.

Key Features

• 5/16-18 thread with 0.562-inch thread length for standard tapped-hole installation
• Stainless steel body for corrosion resistance in wash-down or humid environments
• Delrin nose minimizes wear and prevents marring on mating contact surfaces
• Stubby plunger profile fits tight-clearance and space-restricted bores
• Locking element secures plunger position after adjustment
• 1.25-pound initial end force and 4-pound final end force for light detent applications

Compatibility

Designed as an OEM-style replacement or direct-fit component for standard 5/16-18 tapped holes in mechanical assemblies, tooling fixtures, and indexing applications requiring a stubby spring plunger.

Installation Notes

Install using a hex wrench or appropriate driver into a clean, properly tapped 5/16-18 through or blind hole. Torque to the assembly specification for the host material to avoid stripping threads, particularly in aluminum or plastic housings. Ensure the bore is free of chips and debris before threading in the plunger. The locking element should be engaged after the plunger is set to the desired position.