Gibraltar 34154 Non-locking Knob Plunger 1/4-20 Thread

Product Description

The GIBRALTAR 34154 is a non-locking spring plunger designed for indexing, positioning, and light-duty locking applications in industrial and mechanical assemblies. It features a 1/4-20 threaded stud body with a 1/2 inch thread length and a small-diameter plunger measuring 0.1240 inches maximum. The spring delivers an initial end force of 0.50 pounds ramping to a final end force of 2.50 pounds, making it suitable for low-load detent and positioning tasks. The knobless threaded stud configuration allows the plunger to be installed flush or countersunk into a tapped bore without an exposed handle above the surface. Machinists, tool and die technicians, and mechanical assembly professionals typically install this component.

This plunger is suited for use in jigs, fixtures, tooling plates, and machine tool components where repeatable positioning or light detent action is required. The threaded stud design allows direct installation into a tapped hole in metal or engineered plastic assemblies. The 1/8 inch plunger projection and 0.1240 inch plunger diameter make it appropriate for fine-pitch indexing features and precision fixtures where a low-profile, compact plunger is needed. Its locking element provides added resistance against unintended backing out of the threaded bore during operation or vibration.

Key Features

• Non-locking plunger type for smooth, repeatable detent action
• 1/4-20 threaded stud body with 1/2 inch thread length for secure installation in tapped bores
• Spring end force range of 0.50 pounds initial to 2.50 pounds final for light-load positioning
• Knobless threaded stud configuration for low-profile, flush-mount installations
• Locking element resists backing out under vibration or cyclic loading
• Maximum plunger diameter of 0.1240 inches suits precision fixture and tooling applications

Compatibility

Designed as an OEM-style replacement or direct-fit component for industrial jigs, fixtures, tooling plates, and mechanical assemblies requiring a 1/4-20 threaded non-locking spring plunger.

Installation Notes

Installation is typically performed by machinists or mechanical assembly technicians using a standard hex wrench or spanner tool sized for the stud head. The receiving bore must be tapped to 1/4-20 specification before installation. Ensure the mating bore is clean and free of debris before threading the stud in. Do not overtighten, as this can deform the plunger bore or affect spring travel and end force characteristics.