Gibraltar 57089G Threaded Spring Plunger 1/4-28 Steel

Product Description

The GIBRALTAR 57089G is a threaded spring plunger designed for indexing, positioning, and locating applications in mechanical assemblies. The plunger features a 1/4-28 thread with a 1 inch thread length and a maximum plunger diameter of 0.118 inches. A Delrin nose rides against mating surfaces to minimize marring, while the steel body provides structural durability. An integrated locking element locks the plunger in place once threaded to the correct depth, preventing back-out from vibration. Initial end force is 3 pounds with a final end force of 13 pounds, making this suitable for light-duty positioning and detent work.

This spring plunger is used in machine tool fixtures, jigs, production equipment, and precision mechanical assemblies where repeatable positioning or detent action is required. The 3/16 inch projection provides the travel needed for typical indexing applications. The black finish and compact body length of 1 inch suit installations with limited clearance. Machinists, tool-and-die makers, and mechanical assembly technicians install this type of component in both production and maintenance contexts.

Key Features

• 1/4-28 thread size with 1 inch thread length for standard tapped hole installation
• Locking element prevents back-out and maintains set depth under vibration
• Delrin nose minimizes surface marring on mating components
• Steel body construction for durability in industrial environments
• 3 pound initial end force and 13 pound final end force for light-duty detent and positioning
• Black finish with 3/16 inch plunger projection

Compatibility

Designed for use in standard 1/4-28 tapped holes in mechanical fixtures, jigs, machine tool components, and production assembly equipment requiring spring-loaded positioning or detent action.

Installation Notes

Install using a 5/64 inch hex key to thread the plunger body into a pre-tapped 1/4-28 hole. Ensure the mating hole is clean and free of debris before installation. Tighten to the desired depth and engage the locking element to secure position. Depressurize or de-energize any pneumatic or powered equipment before servicing assemblies that contain spring plungers.