Jergens 26928 Threaded Spring Plunger 1/2-13 Steel

Product Description

The JERGENS 26928 is a threaded spring plunger designed for indexing, locating, and positioning applications in industrial assemblies and fixtures. It features a 1/2-13 thread with a 1-1/4 inch thread length and a standard-length steel body. The plunger nose diameter is 0.248 inches with a 1/4 inch projection beyond the mounting surface. Initial end force is 6.6 pounds and final end force is 17.4 pounds, providing a defined engagement force range suitable for repeatable positioning. The steel body and nose construction give this plunger durability in demanding shop and production environments. Installed by machinists, toolmakers, and maintenance technicians.

This spring plunger is suited for use in jigs, fixtures, machine tool components, and automation tooling where a reliable spring-loaded positioning element is required. The locking element feature allows the plunger to be secured in position after installation, preventing loosening from vibration or repeated cycling. The 1/4 inch hex allows installation and adjustment with standard tooling. Typical applications include part locating in workholding fixtures and detent positioning in industrial equipment.

Key Features

• 1/2-13 thread size with 1-1/4 inch thread length for secure mounting in steel or aluminum fixtures
• 0.248 inch maximum plunger diameter with 1/4 inch projection for consistent part engagement
• 6.6 pound initial end force and 17.4 pound final end force for defined spring resistance
• Locking element included to prevent back-out under vibration or cyclic loading
• Steel body and steel nose for durability in production and tooling environments
• 1/4 inch hex drive for installation and torque with standard hand tools

Compatibility

Designed as an OEM-style threaded spring plunger for use in jigs, fixtures, and industrial tooling applications requiring a 1/2-13 threaded locating or indexing element.

Installation Notes

Threaded spring plungers are typically installed by machinists or toolmakers using a hex key or wrench on the 1/4 inch hex drive. Ensure the mating threaded hole is clean and properly tapped to 1/2-13 before installation. Engage the locking element after positioning to prevent loosening during operation. De-energize or lock out any associated equipment before servicing or replacing plungers in active fixtures.