Gibraltar 57190G Threaded Spring Plunger 5/16-18

Product Description

The GIBRALTAR 57190G is a threaded spring plunger designed for indexing, positioning, and locking applications in mechanical assemblies. It features a 5/16-18 thread with a 1 inch thread length and a standard plunger projection of 3/16 inches. The plunger tip is made from Delrin for low-friction contact, while the body is steel with a black finish for corrosion resistance. A built-in locking element secures the plunger in position once set. Initial end force is 1.5 pounds and final end force is 4.5 pounds, making it suitable for light-duty indexing and detent work. Machinists, toolmakers, and mechanical assemblers are the primary installers.

This spring plunger is used in fixtures, jigs, machine tools, and general industrial assemblies where repeatable positioning or light locking force is needed. The 5/16-18 threaded body installs directly into a tapped hole. The Delrin nose protects mating surfaces from scoring during repeated engagement. Its compact form factor fits tight clearance applications where space is limited.

Key Features

• 5/16-18 thread size with 1 inch thread length for standard tapped-hole installation
• 3/16 inch plunger projection for positive detent engagement
• 1.5 pound initial end force and 4.5 pound final end force for light-duty indexing
• Delrin nose minimizes wear and protects mating surfaces
• Steel body with black finish for durability
• Integrated locking element holds the plunger setting once adjusted
• 3/32 inch hex drive for installation and adjustment

Compatibility

Designed as an OEM-style replacement or new-installation threaded spring plunger for fixtures, jigs, and mechanical assemblies requiring a 5/16-18 tapped hole.

Installation Notes

Installation requires a properly tapped 5/16-18 hole in the mating component. Use a 3/32 inch hex key to drive and seat the plunger body. Ensure the assembly is de-energized and at rest before servicing any spring plunger in a loaded mechanism. Do not overtighten, as this can compress the internal spring beyond its working range and reduce end force.