Gibraltar SWPN-8A-PT-G Threaded Spring Plunger 1/2-13

Product Description

The GIBRALTAR SWPN-8A-PT-G is a standard-length threaded spring plunger designed for indexing, positioning, and light-duty locking applications in industrial and mechanical assemblies. The steel body measures 1-1/4 inches in thread length and accepts a 1/2-13 thread size, making it compatible with standard tapped holes in machined components. The plunger nose is phenolic, with a minimum diameter of 0.246 inches and a maximum diameter of 0.248 inches. A built-in locking element secures the plunger at the installed depth once torqued, preventing back-out under vibration or repeated cycling. Initial end force is 2.7 pounds and final end force is 9.3 pounds, providing a positive detent feel suitable for repeatable positioning tasks.

This spring plunger is used in fixtures, jigs, machine tool components, and automated equipment where a spring-loaded detent is needed to hold a workpiece or moving assembly in a defined position. The phenolic nose reduces marring on softer workpiece surfaces, making it suitable for setups where surface finish matters. Machinists, tool-and-die makers, and mechanical assembly technicians typically install this component in production or prototype fixturing environments.

Key Features

• 1/2-13 thread size fits standard tapped holes in machined steel, aluminum, and cast components
• Steel body construction for durability in industrial environments
• Phenolic nose minimizes surface damage on contacted workpieces
• Locking element prevents back-out under vibration or repeated load cycling
• 2.7-pound initial end force and 9.3-pound final end force for consistent detent performance
• Standard plunger length type for straightforward drop-in installation

Compatibility

Designed as an OEM-style replacement or new-installation spring plunger for standard 1/2-13 tapped holes in industrial fixtures, jigs, and mechanical assemblies.

Installation Notes

Installation requires a properly tapped 1/2-13 hole at the correct depth to allow full plunger travel. Engage the locking element after the plunger is threaded to the desired depth using an appropriate hex key or spanner tool. Ensure the mating hole is free of chips and debris before installation. No special certifications are required for installation, but follow applicable machinery safety lockout procedures when servicing live equipment.