Jergens 26871 Threaded Spring Plunger M5 X 0.8 Steel

Product Description

The JERGENS 26871 is a threaded spring plunger designed for positioning, indexing, and light-duty detent applications in tooling, fixtures, and machine assemblies. It features an M5 x 0.8 thread with a 19 mm thread length, allowing secure installation into tapped holes in steel, aluminum, or cast iron workpieces. The plunger nose projects 3 mm and has a maximum diameter of 2.36 mm. Both the body and nose are constructed of steel with a black finish, providing durability in industrial environments. This part is typically installed by tool and die makers, machinists, and maintenance technicians working with jigs, fixtures, and precision assemblies.

This spring plunger suits applications where repeatable part positioning or light detent action is required. It is commonly used in tooling plates, fixture bodies, machine slides, and index mechanisms in manufacturing and assembly environments. The compact M5 thread size makes it appropriate for tight-space installations where larger plungers are not suitable. An initial end force of 1.31 kg and a final end force of 5.00 kg provide a defined spring resistance range suited to light-load indexing and positioning tasks.

Key Features

• M5 x 0.8 thread size with 19 mm thread length for full thread engagement
• 3 mm plunger projection with 2.36 mm maximum nose diameter
• Steel body and steel nose with black finish for corrosion resistance in industrial use
• Initial end force of 1.31 kg and final end force of 5.00 kg for defined detent resistance
• No locking element - standard spring plunger configuration for straightforward installation
• 2.50 mm hex size for precise installation with a hex key

Compatibility

Designed as a direct-fit threaded spring plunger for any application requiring an M5 x 0.8 tapped hole with a standard spring plunger detent or positioning function in tooling and fixture assemblies.

Installation Notes

Installation is performed by threading the plunger into a pre-tapped M5 x 0.8 hole using a 2.50 mm hex key. Ensure the mating thread is clean and free of chips or debris before installation. Do not overtighten, as this can compress the internal spring beyond its design range or damage the thread. De-energize or lock out any associated machine or fixture before servicing spring plungers in operational assemblies.