Gibraltar HDLS-3-PT-G Locking Knob Handle Plunger

Product Description

The GIBRALTAR HDLS-3-PT-G is a locking knob handle plunger designed for use in workholding, fixturing, and indexing applications across industrial and mechanical assemblies. Featuring a 3/8-16 thread size with a 0.75 inch thread length, this plunger delivers a spring end force range of 1 pound initial to 8 pounds final, providing controlled, repeatable positioning force. The countersunk knob style and locking element allow the operator to fix the plunger position without drift, making it well suited for precision setups. Constructed from steel with a gold zinc chromate finish for corrosion resistance, this is a compact, functional component built for repeated use in demanding environments.

This plunger is appropriate for use in machine tool fixtures, jigs, panel assemblies, and other industrial equipment where a low-profile locking mechanism is required. The countersunk knob integrates cleanly into flat surfaces, minimizing protrusion in tight clearance designs. With a maximum plunger diameter of 0.185 inches and a plunger projection of 0.22 inches, it fits compact mounting configurations. Machinists, tool and die technicians, and mechanical assembly professionals typically specify and install this type of component.

Key Features

• Locking plunger type with integrated locking element to hold position under load
• Spring end force range: 1 pound initial to 8 pounds final for controlled indexing force
• 3/8-16 thread size with 0.75 inch thread length for standard tapped-hole installation
• Countersunk knob style for flush or near-flush mounting on flat panels
• Steel construction with gold zinc chromate finish for corrosion resistance
• Compact plunger projection of 0.22 inches suits tight clearance assemblies

Compatibility

Designed as an OEM-style or aftermarket replacement locking handle plunger for industrial fixtures, jigs, and mechanical assemblies requiring a 3/8-16 threaded mounting hole.

Installation Notes

Installation is performed by threading the plunger body into a pre-tapped 3/8-16 hole to the desired depth. Use a 7/32 inch hex key on the hex flat to set final position and achieve proper torque against the mounting surface. Ensure the mating bore or detent is aligned with the plunger tip before tightening. Disengage the locking mechanism and verify free plunger travel before returning equipment to service.