Gibraltar 57090G Threaded Spring Plunger 5/16-18 Steel

Product Description

The GIBRALTAR 57090G is a threaded spring plunger designed for indexing, positioning, and light-duty locking applications in mechanical assemblies. It features a 5/16-18 thread size with a 1 inch thread length and a standard plunger projection of 3/16 inches. The plunger nose is made from Delrin for smooth, low-friction contact, while the body is constructed from steel finished in black. A built-in locking element secures the plunger in position once installed, preventing loosening from vibration or repeated cycling. This part is used by machinists, industrial maintenance technicians, and mechanical assemblers working with jigs, fixtures, and equipment panels.

The 57090G suits applications where controlled spring force is required to hold, locate, or detent a moving component. With an initial end force of 3 pounds and a final end force of 15 pounds, it provides a firm positive engagement suitable for light-load indexing tasks. The 3/32 inch hex drive allows installation and adjustment with a standard hex key in confined spaces. It is commonly installed in fixture plates, tooling bodies, machine guards, and panel assemblies across industrial and manufacturing environments.

Key Features

• 5/16-18 thread with 1 inch thread length for standard tapped-hole installation
• Delrin plunger nose for low-friction, wear-resistant contact
• Steel body with black finish for durability and corrosion resistance
• Built-in locking element prevents backing out under vibration
• 3 pounds initial end force and 15 pounds final end force for positive detent engagement
• 3/32 inch hex drive for tool-access installation in tight spaces

Compatibility

Designed for use in any application with a 5/16-18 tapped hole requiring a standard spring plunger with locking capability and a 1 inch thread engagement depth.

Installation Notes

Installation is performed by threading the plunger into a pre-tapped 5/16-18 hole using a 3/32 inch hex key. Ensure the mating hole is clean and free of debris before threading in the plunger. The locking element should be engaged fully to prevent movement after final positioning. Do not overtighten, as this can damage the locking element or distort the plunger body.