Jergens 30473 Threaded Spring Plunger M8 X 1.25

Product Description

The JERGENS 30473 is a threaded spring plunger designed for indexing, positioning, and light-duty locking applications in industrial assemblies and fixtures. The plunger features a steel body with a Delrin nose and threads at M8 x 1.25 with a 25 mm thread length. It provides a plunger projection of 5 mm and a maximum plunger diameter of 3.43 mm. The steel body is finished in black and uses a 4 mm hex for installation. Initial end force is 1.35 kg and final end force is 6.75 kg, making it suitable for controlled-resistance positioning tasks. Machinists, toolmakers, and fixture builders install this type of component in jigs, dies, and production tooling.

This spring plunger is used in machine fixtures, assembly jigs, and production tooling where repeatable part positioning or light detent action is required. The Delrin nose reduces marring on workpiece surfaces, making it well suited for applications where contact with finished or semi-finished parts is necessary. It is commonly installed in steel fixture plates and aluminum tooling bodies in both job-shop and production manufacturing environments.

Key Features

• M8 x 1.25 thread with 25 mm thread length for secure installation in standard threaded holes
• Delrin nose minimizes surface damage on contacted workpieces
• Steel body with black finish for durability and corrosion resistance in shop environments
• 5 mm plunger projection provides positive detent engagement
• Initial end force of 1.35 kg and final end force of 6.75 kg for controlled positioning resistance
• 4 mm hex drive allows installation and removal with standard hex key tooling

Compatibility

Designed as an OEM-style threaded spring plunger for installation in any fixture plate, tooling body, or mechanical assembly with a standard M8 x 1.25 threaded bore.

Installation Notes

Install using a 4 mm hex key into a clean, properly tapped M8 x 1.25 through or blind hole. Ensure the bore depth accommodates the full 25 mm thread length to prevent bottoming before the plunger seats correctly. Do not overtighten, as this can restrict plunger movement or damage the Delrin nose. Power down any automated or motorized equipment before servicing fixtures that contain spring plungers.