Gibraltar KLS-4-G Locking Knob Plunger 1/2-13 Thread

Product Description

The GIBRALTAR KLS-4-G is a locking knob handle plunger designed for indexing, positioning, and clamping applications in industrial and mechanical assemblies. It features a 1/2-13 thread with a 0.65-inch thread length and a knurled knob head that allows tool-free hand adjustment with positive locking. The plunger delivers an initial end force of 0.5 pounds and a final end force of 4 pounds, making it suitable for light-duty holding and locating tasks. The head diameter is 1.0 inch with a head height of 0.48 inches. Machinists, toolmakers, and maintenance technicians working with jigs, fixtures, and machine tool setups typically install this type of hardware.

This plunger is suited for use in industrial equipment, tooling fixtures, and mechanical assemblies requiring a compact, hand-operated locking mechanism. The knurled knob allows secure grip and controlled engagement without additional tooling. With a plunger projection of 0.25 inches and a length under head of 0.9 inches, it fits into tight mounting locations common in fixture plates, enclosures, and positioning assemblies.

Key Features

• Locking plunger type with knurled knob for tool-free hand operation
• 1/2-13 thread size with 0.65-inch thread length for standard tapped-hole installation
• Initial end force of 0.5 pounds, final end force of 4 pounds for light-duty holding
• 1.0-inch head diameter with 0.48-inch head height for low-profile mounting
• 0.25-inch plunger projection suitable for compact fixture and indexing applications
• Maximum plunger diameter of 0.249 inches for precise locating fit

Compatibility

Designed as a standard replacement or new-installation locking knob plunger for industrial fixtures, jigs, enclosures, and mechanical positioning assemblies using a 1/2-13 tapped mounting hole.

Installation Notes

Installation is performed by threading the plunger into a properly tapped 1/2-13 hole by hand or with a wrench applied to the knob base. Ensure the mating hole is clean and correctly tapped to the full thread depth before installation. Confirm the plunger projection aligns with the intended locating or clamping surface before final tightening. Follow applicable facility maintenance and lockout procedures when installing hardware on powered equipment.