Gibraltar KN1C----B7SL-21 Ball Knob Female Insert

Product Description

The GIBRALTAR KN1C----B7SL-21 is a thermoplastic ball knob with a female insert mount, designed for use as a hand-tightening control knob on machinery, fixtures, and equipment assemblies. The knob measures 1.88 inches in diameter and 1.75 inches in height, providing a comfortable grip surface for manual adjustment tasks. Its female insert accepts a 5/8-11 threaded fastener, with a hole depth of 0.55 inches. The black thermoplastic construction offers durability and resistance to light chemical exposure in typical shop or industrial environments. Maintenance technicians, machinists, and equipment assemblers are the primary installers of this hardware component.

This ball knob is suited for use on machine tool guards, control panels, jigs, fixtures, and general industrial equipment where a low-profile, hand-operable fastening point is needed. The female insert style makes it appropriate for threaded stud or bolt applications where the knob is pressed or secured onto an existing threaded post. It is commonly used in both light manufacturing and trade equipment maintenance settings.

Key Features

• Female insert mount accepts 5/8-11 threaded fasteners
• 1.88-inch ball diameter provides a solid grip surface for manual operation
• Thermoplastic construction — lightweight and resistant to corrosion
• Hole depth of 0.55 inches accommodates standard stud engagement
• Hub diameter of 1.00 inch for stable seating on mounting surfaces
• Black finish for standard industrial visibility and aesthetics

Compatibility

Designed as a replacement or new-installation female insert ball knob for machinery, fixtures, and equipment assemblies using 5/8-11 threaded studs or bolts.

Installation Notes

Installation requires no special tools beyond hand pressure or light press-fit onto a 5/8-11 threaded post. Verify thread engagement depth does not exceed the 0.55-inch hole depth to avoid bottoming out the insert. Power down or de-energize any equipment before replacing control knobs on live machinery. Follow applicable machine guarding and equipment maintenance codes for your trade and jurisdiction.