Gibraltar SWPN-4-G Threaded Spring Plunger 1/4-20

Product Description

The GIBRALTAR SWPN-4-G is a standard threaded spring plunger designed for indexing, positioning, and light-duty locking applications in mechanical assemblies. It features a 1/4-20 thread with a 1 inch thread length and a phenolic nose that contacts the workpiece without marring metal surfaces. The steel body provides durable support for the internal spring mechanism. Initial end force is 3 pounds and final end force is 13 pounds, making this plunger suitable for applications that require a firm, repeatable detent feel. Machinists, tool and die makers, and mechanical assemblers commonly install this type of hardware in jigs, fixtures, and positioning equipment.

This spring plunger is used in light industrial and precision mechanical applications where controlled indexing or detent positioning is required. It threads directly into a tapped hole and provides a spring-loaded projection of 3/16 inch. Typical installations include machine tool fixtures, assembly jigs, and equipment panels where a positive but releasable stop or locating point is needed. The phenolic nose material is well suited for use against aluminum, plastic, or finished metal surfaces where marring is a concern.

Key Features

• 1/4-20 thread size with 1 inch thread length for secure installation in standard tapped holes
• 3/16 inch plunger projection provides consistent detent engagement
• 3 pound initial end force and 13 pound final end force for firm, repeatable positioning
• Steel body construction for durability in industrial environments
• Phenolic nose minimizes surface marring on contact materials
• No locking element — standard configuration for straightforward threaded installation

Compatibility

Designed as a standard-thread spring plunger for use in any tapped 1/4-20 hole requiring a spring-loaded detent or positioning mechanism in mechanical assemblies and fixtures.

Installation Notes

Installation requires a properly tapped 1/4-20 through or blind hole. Thread the plunger in by hand first, then use an appropriate hex key or driver to achieve full seating — do not overtighten, as the steel body can be damaged if torqued excessively. Ensure the plunger axis aligns with the intended contact surface to avoid side loading the nose. No power lockout is required for this hardware, but the surrounding assembly should be de-energized or de-pressurized before servicing if the plunger is part of a live machine.