Gibraltar KN4C----B1SL-21 Ball Knob 1 Inch Thermoplastic

Product Description

The GIBRALTAR KN4C----B1SL-21 is a thermoplastic ball knob with a female insert mount designed for use in light mechanical assemblies, control panels, and machine guarding applications. The knob measures 1 inch in diameter and 0.91 inches in height, with a 1/4-20 threaded female insert for secure fastening to threaded shafts or studs. The ball-grip profile gives operators a reliable handhold for frequent adjustments. Fabricated from black thermoplastic, this knob resists moderate chemicals and light impact. Electricians, machine builders, and maintenance technicians commonly install this type of hardware during panel assembly or equipment adjustment-point setups.

This ball knob suits residential and light commercial control panel builds, enclosure door hardware, and general machine adjustment applications. The female insert threading accepts standard 1/4-20 fasteners, making it broadly compatible with common threaded hardware used in electrical enclosures, HVAC equipment covers, and production machinery. The compact 1-inch diameter is suited for situations where space is limited but a positive hand grip is still required.

Key Features

• Ball-grip shape provides a positive handhold for repeated manual adjustments
• Female insert with 1/4-20 thread accepts standard threaded studs and bolts
• 1 inch head diameter and 0.91 inch height fit compact mounting areas
• Hole depth of 0.55 inches accommodates typical stud engagement lengths
• Black thermoplastic construction resists light chemicals and everyday wear
• Hub diameter of 0.62 inches provides a stable base on flat mounting surfaces

Compatibility

Designed as a general-purpose replacement or new-installation ball knob for any assembly using a 1/4-20 threaded stud or bolt where a 1-inch diameter female-insert knob is specified.

Installation Notes

Installation requires no special tools beyond a standard 1/4-20 threaded stud or mating bolt. Ensure the mating thread is clean and free of debris before threading the knob on. Do not exceed hand-tight torque for thermoplastic inserts, as overtightening can crack the hub or strip the insert. De-energize any equipment before performing panel or enclosure hardware work in accordance with NFPA 70E lockout/tagout requirements.