RS PRO Black Ball Clamping Knob, M4, Threaded Hole

Knobs are used in a wide variety of applications in our day-to-day lives and perform many functions, from being used as fixed handles to being used to tighten, loosen, adjust, clamp and push other components or pieces of equipment. They are used in various applications, from industrial and construction machinery to audio and visual equipment.

Ball knobs are often used finishing elements on furniture and general appliances, as well as to provide a grip/comfort point on levers and handles. The knobs are fitted with either a protruding screw (male), a threaded insert (female) or through threads depending on the requirements of the application.

These female knobs are made from Duroplast, a composite thermosetting plastic reinforced with fibers (either cotton or wool), making it a fiber-reinforced plastic similar to fiberglass. It is lightweight yet durable and strong, making it ideal for use in a wide variety of light/medium-duty applications.

Female knobs: M4 (RS 686008), M5 (RS 686014), M6 (RS 686020), M8 (RS 686036), M8 (RS 686042), M10 (RS 686058).

• Moulded threads


• Resistant to most industrial chemicals, oils, grease, and adverse weather, including ultra-violet light


• Gloss Black


• Temperature rating -30 to + 140°C


• Made to BS771 standards

Ball knobs are used in a variety of applications, but are commonly used to ensure user comfort on the ends of levers and handles as well as being used in furniture, such as drawer and door handles:

• Levers & handles


• Furniture


• Appliances


• Tools


• Machine jigs