Jergens 27104 Threaded Spring Plunger 1/4-20 Steel

Product Description

The JERGENS 27104 is a threaded spring plunger designed for indexing, positioning, and light-duty locking applications in mechanical assemblies. It features a 1/4-20 thread with a 5/8-inch thread length and a steel body with a black finish. The plunger nose is also steel, with a maximum plunger diameter of 0.119 inches and a 3/16-inch projection. Initial end force is 0.30 pounds and final end force is 3.5 pounds. A built-in locking element secures the plunger in place once installed, preventing loosening from vibration or movement during operation. Machinists, tool and die makers, and mechanical assemblers are the typical installers.

The JERGENS 27104 is suited for use in jigs, fixtures, tooling plates, and production machinery where repeatable positioning or light retention is required. The short plunger length type makes it appropriate for applications with limited depth or where minimal projection beyond the work surface is needed. It is commonly used in both manual and automated assembly environments across general manufacturing, aerospace tooling, and precision machining operations.

Key Features

• 1/4-20 thread size with 5/8-inch thread length for standard threaded hole installation
• 3/16-inch plunger projection suitable for short-travel indexing and positioning
• Steel body and steel nose for durability in industrial environments
• Black finish for corrosion resistance and clean appearance in tooling applications
• Locking element prevents unintended back-out under vibration
• 0.30 lb initial end force and 3.5 lb final end force for controlled spring resistance

Compatibility

Designed as an OEM-style threaded spring plunger for installation in any standard 1/4-20 threaded hole requiring a short-body plunger with a locking element.

Installation Notes

Install using a hex key or appropriate driving tool into a properly tapped 1/4-20 through or blind hole. Ensure the mating hole is clean and free of debris before threading the plunger in. The locking element engages at final torque to resist back-out, so do not overtighten beyond hand-snug plus a controlled turn. Disengage spring force before servicing any assembly that relies on this plunger for positioning.