Vlier NNS59 Threaded Spring Plunger 3/8-16 Steel

Product Description

The VLIER NNS59 is a standard threaded spring plunger designed for indexing, positioning, and light-duty detent applications in industrial and mechanical assemblies. The body is machined from steel with a Delrin nose, combining durability with low-friction plunger contact. The 3/8-16 external thread and 1-1/8 inch thread length allow direct installation into tapped holes without additional hardware. Initial end force measures 2.8 pounds, with a final end force of 7.2 pounds, making this plunger suitable for consistent, repeatable positioning force in fixtures, tooling, and machine components. Machinists, toolmakers, and maintenance technicians are the primary installers.

The NNS59 fits standard tapped holes in machine frames, jigs, fixtures, and assembly tooling where a spring-loaded detent or positioning element is required. The standard plunger length type suits typical through-body or blind-hole installations. The Delrin nose material provides smooth engagement against mating surfaces without scoring or galling. This plunger is commonly used in light manufacturing, tooling, and mechanical positioning applications across industrial settings.

Key Features

• 3/8-16 external thread with 1-1/8 inch thread length for direct installation into tapped holes
• Steel body construction for durability in industrial environments
• Delrin nose material for low-friction, non-marring plunger contact
• 2.8 pound initial end force and 7.2 pound final end force for consistent detent action
• Plunger diameter range of 0.185 to 0.187 inches for precise fitment
• No locking element, allowing straightforward torque-in installation and adjustment

Compatibility

Designed as a direct-thread replacement or new-install spring plunger for any assembly or fixture with a 3/8-16 tapped hole requiring standard plunger projection and force range.

Installation Notes

Install using a hex wrench or screwdriver in the appropriate drive feature, threading the plunger into a pre-tapped 3/8-16 hole by hand before final torque. Ensure the mating surface and bore are clean and free of chips or debris before installation. No locking element is incorporated, so thread-locking compound may be applied if vibration resistance is required. De-energize or lock out any machine before servicing spring plungers in powered assemblies.