Gibraltar KN4C----B2S--21 Ball Knob Female Insert 1.25in

Product Description

The GIBRALTAR KN4C----B2S--21 is a thermoplastic ball knob with a female insert mount, designed for use as a control or adjustment knob on machinery, enclosures, fixtures, and industrial equipment. The knob measures 1.25 inches in diameter and 1.15 inches in height, with a 0.62-inch hub diameter. It accepts a 1/4-20 threaded insert with a hole depth of 0.55 inches. The black thermoplastic construction provides a durable, lightweight grip suitable for repeated manual adjustment in light industrial and trade applications. Licensed electricians, equipment technicians, and maintenance professionals commonly install this type of knob during panel assembly or equipment service.

This ball knob is suited for use on control panels, electrical enclosures, HVAC equipment access doors, and general-purpose machinery where a positive-grip manual adjuster is needed. The female insert design threads directly onto a 1/4-20 male stud or fastener. It is appropriate for both residential and commercial light-duty applications where hand-tightened control hardware is required. Sold individually with a minimum order quantity of one unit.

Key Features

• Female insert mount accepts 1/4-20 threaded studs
• 1.25-inch ball diameter for comfortable hand grip
• Thermoplastic construction — lightweight and corrosion-resistant
• 0.55-inch hole depth provides secure thread engagement
• Black finish — standard for control panel and equipment applications
• Compact 1.15-inch overall height fits tight mounting clearances

Compatibility

Designed as an OEM-style replacement or direct-fit control knob for equipment and panels using 1/4-20 threaded male studs requiring a female insert ball knob.

Installation Notes

Installation requires no special tools — the knob threads directly onto an exposed 1/4-20 stud by hand. Power down or de-energize any associated equipment before servicing control panels or enclosures. Ensure the mating stud thread length does not exceed the 0.55-inch hole depth to avoid bottoming out before the knob seats fully. This hardware is intended for manual-adjustment applications only and should not be used in high-torque or vibration-intensive drive applications without a locking fastener.