Vlier SSSD56 Threaded Spring Plunger 5/16-18 Stainless Steel

Product Description

The VLIER SSSD56 is a threaded spring plunger designed for indexing, positioning, and light retention applications in mechanical assemblies. The body is machined from stainless steel, and the nose is Delrin, providing corrosion resistance alongside a non-marring contact point. This plunger carries a 5/16-18 thread with a 1-inch thread length, a plunger projection of 3/16 inches, and a plunger diameter ranging from 0.133 to 0.135 inches. Initial end force is 3 pounds and final end force is 15 pounds. It is installed by machinists, tool-and-die technicians, and maintenance mechanics wherever repeatable spring-loaded positioning is required.

This plunger suits standard-length threaded bore applications in jigs, fixtures, machine tool components, and automation equipment. Its stainless steel body makes it appropriate for environments where mild corrosion resistance is needed. The Delrin nose reduces surface damage to mating parts during repeated contact cycles. The 5/16-18 thread is a common unified coarse pitch, compatible with a wide range of tapped holes in ferrous and non-ferrous workpieces.

Key Features

• Stainless steel body for corrosion resistance in demanding shop environments
• Delrin nose minimizes marring on mating surfaces during repeated engagement
• 3-pound initial end force and 15-pound final end force for positive positioning feedback
• Standard plunger length type with 1-inch body and thread length
• Plunger projection of 3/16 inches suits shallow indexing applications
• No locking element - allows straightforward thread-in installation and adjustment

Compatibility

Designed as an OEM-style threaded spring plunger for tapped 5/16-18 bores in jigs, fixtures, and precision mechanical assemblies requiring spring-loaded indexing or retention.

Installation Notes

Installation is performed by threading the plunger directly into a tapped 5/16-18 bore using a hex key or appropriate drive tool. Ensure the mating bore is clean and free of debris before installation. Torque to the assembly manufacturer's specification and verify plunger travel is unobstructed before returning the assembly to service. Power down or de-energize any automated equipment before servicing spring plungers in active assemblies.