Jergens 26878 Threaded Spring Plunger M20 X 2.5 Steel

Product Description

The JERGENS 26878 is a threaded spring plunger designed for indexing, positioning, and light-duty locking applications in industrial machinery and tooling fixtures. The steel body and steel nose provide consistent durability in production environments. It features an M20 x 2.5 thread with a 44 mm thread length, a maximum plunger diameter of 9.5 mm, and a plunger projection of 8 mm. Initial end force is 3.05 kg and final end force is 16.95 kg, giving the installer predictable spring resistance across the plunger stroke. A 10 mm hex drive allows straightforward torque-to-seat installation with standard hand tools.

This spring plunger is suited for use in machine tool fixtures, jigs, assembly tooling, and automation equipment where repeatable part location or light detent action is required. The black finish helps resist surface corrosion in shop environments. No locking element is present, making this a free-threaded design that relies on wrench engagement at the hex for final positioning. It is typically installed by machinists, tool and die makers, or mechanical maintenance technicians during fixture build or equipment maintenance.

Key Features

• M20 x 2.5 thread with 44 mm thread length for deep engagement in thick tooling plates
• Steel body and steel nose for durability in production and fixture applications
• 8 mm plunger projection with 9.5 mm maximum plunger diameter
• Initial end force of 3.05 kg and final end force of 16.95 kg for controlled spring resistance
• 10 mm hex drive for precise installation with standard wrenches
• Black finish for corrosion resistance in shop environments

Compatibility

Designed as a standard threaded spring plunger for industrial fixtures, jigs, and machine tool applications requiring an M20 x 2.5 threaded body with steel construction.

Installation Notes

Installation is performed by threading the plunger body into a tapped M20 x 2.5 hole using a 10 mm hex wrench. Ensure the mating bore is clean and correctly tapped to full depth before installation. De-energize or lock out any machinery before servicing fixtures or tooling that contain spring plungers. Do not overtighten, as excessive torque can deform the plunger body or alter spring preload characteristics.