Vlier H59N Threaded Spring Plunger 3/8-16 Steel Locking

Product Description

The VLIER H59N is a threaded spring plunger designed for indexing, positioning, and light-duty detent applications in mechanical assemblies. It features a 3/8-16 thread with a 1-1/8 inch thread length and a steel body with a steel nose. The plunger delivers an initial end force of 2.8 pounds, a middle end force of 5.0 pounds, and a final end force of 7.2 pounds, providing a controlled, progressive engagement feel. A built-in locking element secures the plunger in the tapped hole without requiring a secondary locknut. This part is installed by mechanical assemblers, maintenance technicians, and tooling specialists working with precision fixtures and machinery.

The H59N is suited for use in machine tools, jigs and fixtures, production equipment, and general industrial assemblies where repeatable positioning or detent action is required. The standard plunger length type makes it appropriate for typical through-hole and blind-hole tapped installations in steel or similarly hard substrates. It installs in any standard 3/8-16 tapped hole and is commonly used wherever a spring-loaded ball or nose plunger is needed for part registration or panel retention.

Key Features

• 3/8-16 thread size with 1-1/8 inch thread length for standard tapped-hole installation
• Steel body and steel nose for durability in industrial environments
• Progressive force profile: 2.8 pounds initial, 5.0 pounds middle, 7.2 pounds final end force
• 3/16 inch plunger projection provides consistent detent engagement depth
• Integrated locking element eliminates the need for a separate locknut
• Nose radius of 0.108 inch for smooth engagement and release

Compatibility

Designed as an OEM-style replacement or direct-install spring plunger for industrial fixtures and machinery with a standard 3/8-16 tapped hole.

Installation Notes

Installation requires a properly tapped 3/8-16 hole in the mating component. Use a hex wrench sized to the 3/16 inch hex to thread the plunger in by the body, not by the nose, to avoid damaging the spring mechanism. The integrated locking element engages the threads during installation to resist loosening under vibration. Ensure the mating hole depth and alignment are verified before applying final torque to avoid side-loading the plunger nose.