Gibraltar KN5C-B2-21-G Ball Knob 1-1/4 in Female Insert

Product Description

The GIBRALTAR KN5C-B2-21-G is a thermoplastic ball knob with a female insert mount, designed for use as a hand-control knob on machine tools, fixtures, jigs, and industrial equipment. The knob measures 1-1/4 inches in diameter and 1-5/32 inches in height, with a smooth grip surface and a 5/8-inch hole depth. The female insert accepts a 5/16-18 threaded fastener, allowing the knob to be installed directly onto a threaded stud or bolt. Its black thermoplastic construction provides a lightweight, durable alternative to metal knobs in low-to-medium torque hand-tightening applications.

This ball knob is suited for use on manufacturing equipment, enclosures, panels, and industrial assemblies where a compact, easy-to-grip control point is needed. The female insert design is common in applications where the mating stud is fixed and the knob is threaded on during assembly or field adjustment. Typical installers include machine builders, maintenance technicians, and industrial assembly personnel working on equipment requiring frequent manual adjustments.

Key Features

• Female insert mount accepts 5/16-18 threaded studs or bolts
• 1-1/4 inch diameter ball knob for comfortable hand grip
• Smooth exterior grip surface
• 5/8 inch hole depth provides secure thread engagement
• Thermoplastic construction — lightweight and corrosion resistant
• Black color for standard industrial appearance

Compatibility

Designed as an OEM-style replacement or direct-fit hand knob for industrial equipment, fixtures, and panels using 5/16-18 threaded studs.

Installation Notes

Installation is performed by hand or with minimal tooling — thread the knob onto the mating 5/16-18 stud until seated. Ensure the mating stud thread is clean and undamaged before installation. Do not exceed hand-tight torque, as thermoplastic inserts can be damaged by over-tightening with tools. Power down or de-energize any equipment before servicing control knobs on live panels or machines.