Gibraltar 34239 Locking Plunger 1/2-13 Threaded Stud Steel

Product Description

The GIBRALTAR 34239 is a locking knob handle plunger with a knobless threaded stud body, designed for use in indexing, positioning, and clamping applications across industrial and mechanical assemblies. It features a 1/2-13 thread size with a 0.875 inch thread length and delivers an initial end force of 2.5 pounds building to a final end force of 10 pounds, providing controlled and repeatable locking pressure. The plunger is constructed from steel with a zinc finish for corrosion resistance. The locking element engages the plunger at the set position, making this component suitable for assemblies requiring positive retention. This type of hardware is typically installed by machinists, maintenance technicians, and equipment fabricators working on jigs, fixtures, and production machinery.

The GIBRALTAR 34239 is suited for use in light to medium-duty industrial fixtures, machine tool setups, and mechanical assemblies where a threaded stud mount is required and no external knob is needed. The knobless threaded stud design allows it to accept a customer-supplied knob or to be integrated flush into a panel or bracket. It is appropriate for both OEM manufacturing applications and field-level maintenance work on production equipment.

Key Features

• Locking plunger element holds position under load without additional fasteners
• 1/2-13 thread size with 0.875 inch thread length for secure mounting
• Knobless threaded stud body accepts 3/8-16 stud thread for custom knob attachment
• Initial end force of 2.5 pounds with a final end force of 10 pounds for controlled engagement
• Maximum plunger diameter of 0.31 inches with a plunger projection of 0.25 inches
• Steel construction with zinc finish for durability and corrosion resistance

Compatibility

Designed as a threaded stud locking plunger for use in industrial fixtures, jigs, and mechanical assemblies requiring a 1/2-13 thread mount with a knobless body.

Installation Notes

Installation is performed by threading the stud body into a tapped hole sized for 1/2-13 threads. Ensure the mating hole is properly tapped and free of debris before installation. De-energize or fully shut down any associated powered equipment before servicing assemblies that incorporate this plunger. Do not exceed the rated end force values, as over-compression can damage the internal locking element.