Gibraltar 34246SS Locking Knob Plunger 3/8-16 Thread

Product Description

The GIBRALTAR 34246SS is a locking knob-style spring plunger with a knobless threaded stud design, intended for use in indexing, positioning, and light-duty clamping applications. It features a 3/8-16 external thread with a 0.75 inch thread length and a maximum plunger diameter of 0.216 inches. The spring delivers an initial end force of 0.75 pounds, building to a final end force of 3 pounds, which makes it suitable for controlled retention and repeatable positioning in jigs, fixtures, and machine components. The integrated locking element locks the plunger in the retracted position when needed. Machinists, toolmakers, and mechanical assembly technicians are the primary installers of this hardware.

This plunger is commonly installed in machine tool fixtures, production jigs, enclosures, and industrial equipment panels where a positive-locking index point is required. The knobless threaded stud configuration allows it to be installed flush or recessed into a tapped bore, with a hex wrench or driver used to tighten it in place. The 31/32 inch length under head and 7/32 inch plunger projection determine the functional envelope for fitment in a given application. No external knob is present, keeping the installed profile low and snag-free.

Key Features

• Locking plunger design holds plunger retracted when locked, preventing unintended extension
• 3/8-16 external thread with 0.75 inch thread length for standard tapped-bore installation
• Spring end force range of 0.75 pounds initial to 3 pounds final for light-duty indexing retention
• Knobless threaded stud style maintains a low installed profile in tight-clearance assemblies
• Maximum plunger diameter of 0.216 inches with a +0.001 inch diameter tolerance
• Internal stud thread size of 5/16-18 for optional knob or driver attachment

Compatibility

Designed as a direct-fit replacement or new-installation locking spring plunger for standard 3/8-16 tapped bores in machine fixtures, jigs, enclosures, and industrial positioning assemblies.

Installation Notes

Installation is performed by threading the plunger body into a prepared 3/8-16 tapped bore using a hex key or appropriate driver on the stud. Ensure the mating bore is clean and free of debris before installation. Apply thread-locking compound only if specified by the fixture design, as permanent locking compounds may prevent future removal or adjustment. Confirm plunger projection and locking function before placing the assembly into service.