Gibraltar KN4C-B2-21-G Ball Knob Female Insert 1-1/4 in

Product Description

The GIBRALTAR KN4C-B2-21-G is a thermoplastic ball knob with a female insert mount designed for use with 1/4-20 threaded fasteners. The knob measures 1-1/4 inches in diameter and 1-5/32 inches in height, with a hole depth of 5/8 inches. The smooth grip surface and molded thermoplastic construction make it suitable for manual adjustment applications on machinery, fixtures, jigs, and industrial equipment. It is typically installed by machinists, maintenance technicians, and equipment assemblers.

This ball knob is suited for light-duty industrial and commercial applications where a secure, hand-operated control point is needed. Common uses include panel adjustments, machine guards, fixtures, and enclosure hardware. The female insert mount threads directly onto standard 1/4-20 studs or bolts, making installation straightforward without special tooling. The black finish blends with standard industrial equipment aesthetics.

Key Features

• Female insert mount accepts standard 1/4-20 threaded fasteners
• Thermoplastic construction provides lightweight, corrosion-resistant performance
• 1-1/4 inch diameter ball provides comfortable hand grip for manual adjustments
• Smooth grip surface for clean, snag-free operation
• 5/8 inch hole depth provides adequate thread engagement on standard studs
• Black color suits standard industrial and commercial equipment applications

Compatibility

Designed as a direct-fit replacement or new-installation ball knob for equipment and fixtures using standard 1/4-20 threaded studs or bolts requiring a female insert-style hand knob.

Installation Notes

Installation requires no special tools — thread the knob onto an existing 1/4-20 stud by hand until seated. Ensure the mating stud length does not exceed the 5/8 inch hole depth to avoid bottoming out before the knob is fully secured. Disengage any powered or pressurized systems before servicing the equipment where this knob is being installed or replaced.