Gibraltar KN8C--B7-L-21-G Ball Knob Female Insert

Product Description

The GIBRALTAR KN8C--B7-L-21-G is a thermoplastic ball knob with a female insert mount designed for use on threaded shafts, rods, and machine controls. The knob measures 1-7/8 inches in diameter and 1-3/4 inches in height, with a 9/16-inch hole depth sized for a 1/2-13 thread insert. The smooth grip surface and durable thermoplastic construction make it suitable for equipment panels, jigs, fixtures, and light industrial machinery where a reliable, easy-to-operate hand knob is required. Machinists, maintenance technicians, and equipment assemblers are the primary installers of this hardware.

This ball knob is appropriate for general industrial and mechanical applications where a threaded female insert style is needed to mate with a 1/2-13 male threaded stud or shaft. Typical use cases include machine tool guards, control panels, enclosures, and fabricated fixtures in shop or industrial environments. The black thermoplastic body offers resistance to routine handling and light chemical exposure common in these settings.

Key Features

• Female insert mount accepts 1/2-13 threaded studs or rods
• 1-7/8 inch diameter provides a comfortable hand grip surface
• 9/16 inch hole depth gives adequate thread engagement for secure fastening
• Smooth grip profile suits applications where gloves or bare hands are used
• Thermoplastic construction is lightweight and corrosion resistant
• Black color finish for a clean, standard industrial appearance

Compatibility

Designed for use with 1/2-13 threaded shafts and studs in general industrial, machine tool, and fixture assembly applications.

Installation Notes

Installation is performed by threading the knob onto a compatible 1/2-13 male stud by hand. Ensure the stud length does not exceed the 9/16 inch hole depth to avoid bottoming out before the knob seats fully. De-energize and lock out any machine before servicing or replacing knobs on active equipment. No special tools are required for standard hand-tightened installations.