Gibraltar 34058 Locking Knob Plunger 1/2-13 Thread

Product Description

The GIBRALTAR 34058 is a locking plunger with a knobless threaded stud configuration, designed for use in workholding, fixturing, and positioning applications common in industrial and mechanical assembly environments. The plunger features a 1/2-13 body thread and a thread length of 0.875 inches, with a maximum plunger diameter of 0.249 inches. Initial end force is 1.25 pounds, building to a final end force of 5 pounds, providing consistent spring-loaded holding force with a locking element to secure the plunger in the retracted or extended position. This part is typically installed by machinists, tool and die technicians, and maintenance mechanics working on jigs, fixtures, and adjustable tooling setups.

The 34058 is suited for light-duty locking and positioning tasks in machine shops, production lines, and fabrication environments. Its knobless threaded stud design allows it to be installed flush or into confined assemblies where a protruding knob is not practical. The plunger projection of 0.25 inches and a length under head or shoulder of 1.125 inches make it appropriate for compact fixture designs requiring controlled plunger engagement.

Key Features

• Locking element holds plunger in retracted or extended position without drift
• Knobless threaded stud style allows installation in tight or recessed fixture locations
• 1/2-13 body thread with 0.875 inch thread length for secure mounting
• Spring force range from 1.25 pounds initial to 5 pounds final end force
• Maximum plunger diameter of 0.249 inches with a tolerance of plus 0.001 inches
• Plunger projection of 0.25 inches and plunger length of 1.937 inches

Compatibility

Designed as a direct-fit locking plunger for industrial fixtures, jigs, and positioning assemblies requiring a 1/2-13 threaded body and knobless stud installation style.

Installation Notes

Installation is performed by machinists or maintenance technicians using standard threading tools compatible with 1/2-13 thread forms. Ensure the mating threaded bore is clean and free of debris before installation. Secure the stud thread to the specified engagement depth for the application to maintain proper end-force performance. De-energize or lock out any machinery before servicing fixtures or tooling that incorporate this plunger.