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

Product Description

The GIBRALTAR SWPN-4A-PT-G is a threaded spring plunger designed for indexing, positioning, and light-duty locking applications in mechanical assemblies. It features a 1/4-20 thread size with a 1 inch thread length and a standard-length steel body measuring 1 inch. The phenolic nose provides a non-marring contact point, while the integrated locking element secures the plunger in position once installed. Initial end force is 1 pound and final end force is 4 pounds, making this plunger suitable for light-load positioning tasks. Licensed tradespeople and machine assemblers install this type of component in fixtures, jigs, enclosures, and production tooling.

This spring plunger is used in both light industrial and OEM assembly applications where a repeatable, spring-loaded detent or positioning point is required. Typical installations include machine frames, tool fixtures, enclosures, and adjustable mechanical assemblies where the plunger nose engages a drilled hole or groove to hold a component in a set position. The locking element prevents the plunger from backing out under vibration, making it suitable for dynamic or high-cycle environments.

Key Features

• 1/4-20 thread size with 1 inch thread length for direct installation into tapped holes
• Steel body construction for durability in industrial environments
• Phenolic nose material provides non-marring contact at the plunger tip
• Integrated locking element prevents plunger from loosening under vibration
• 1 pound initial end force and 4 pound final end force for light-load positioning
• Standard plunger length type for common fitment in tooling and fixture applications

Compatibility

Designed as a standard threaded spring plunger for use in any application requiring a 1/4-20 tapped hole and a spring-loaded positioning or detent function.

Installation Notes

Install using a hex key or appropriate driver into a clean, properly tapped 1/4-20 through or blind hole. Ensure the mating surface is free of debris before threading in the plunger to avoid cross-threading. The locking element should be engaged fully to resist back-out during service. Always follow the equipment manufacturer's assembly specifications when installing spring plungers in load-bearing or safety-critical fixtures.