Vlier NNS54 Threaded Spring Plunger 1/4-20 1in Thread

Product Description

The VLIER NNS54 is a standard threaded spring plunger designed to provide controlled, spring-loaded ball or nose engagement in positioning, indexing, and detent applications. It features a 1/4-20 thread with a 1 inch thread length and a steel body, making it well suited for use in precision mechanical assemblies, fixtures, jigs, and tooling. The Delrin nose minimizes galling and wear against mating surfaces. Initial end force is 3 pounds and final end force is 13 pounds, giving technicians and machinists a predictable engagement range for repeatable positioning tasks.

This plunger is commonly installed in machine tool fixtures, assembly jigs, production tooling, and industrial equipment wherever a spring-loaded detent or indexing point is required. The 1/4-20 thread fits a wide range of standard tapped holes found in steel plates, aluminum fixtures, and fabricated frames. The 3/16 inch projection and 0.118 inch plunger diameter suit applications where a low-profile, positive-stop engagement is needed. Installation is straightforward and typically performed by machinists, toolmakers, or maintenance technicians.

Key Features

• 1/4-20 thread with 1 inch thread length for standard tapped-hole installation
• Steel body provides durability in production and industrial environments
• Delrin nose reduces wear and friction against mating surfaces
• 3 pound initial end force and 13 pound final end force for predictable detent engagement
• 3/16 inch plunger projection suits low-profile detent and indexing applications
• No locking element - allows full adjustment and removal without thread-locking features

Compatibility

Designed as an OEM-style replacement or direct installation component for machinery, fixtures, and tooling assemblies using standard 1/4-20 tapped holes requiring a spring plunger detent.

Installation Notes

Installation is performed by threading the NNS54 into a pre-tapped 1/4-20 hole using a hex key or appropriate driver. Ensure the mating hole is clean and free of debris before installation. No locking element is present, so thread-locking compound may be applied if vibration resistance is required - follow the compound manufacturer instructions for cure time before loading the plunger. Always de-energize or lock out equipment before servicing spring plunger assemblies in live machinery.