Clamping knobs are usually used to pull, twist and lock a handle or lever. They ensure that the handle or lever does not slip out of your hands during the turning or locking and they also provide a good grip to ensure smooth functioning of the handle or lever.
Clamping knobs may be manufactured in bakelite, steel, stainless steel or steel alloy, aluminum, brass or plastic. They have a threaded bottom insert which is to be fitted to the lever or handle, and the knob portion may be shaped to fit the finger grip of the hand.
There are several design options available and depending on the type of pressure that will be put on the lever or handle, you can choose the most appropriate one. Some of the designs are:
Solid top Knob: This blunt-edged knob is rounded to give a firm, comfortable grip and comes in a soft-touch TPE (thermoplastic elastonomer) covering over solid glass reinforced plastic. Ideal for heavy-duty functions, this knob has a short metal handle which can be clamped on to the lever or handle as required. It can also be ordered with a threaded insert only, in case you don't require the metal handle.
Lobed: These clamping knobs are designed with a varying number of lobes or sections arranged circularly round the knob to provide different types of grip. Ranging from three to eight lobed types, these knobs come in different materials like steel, glass, glass-fiber, plastic of various densities and properties, aluminum, brass, alloys etc. They may have added reinforcements, threading and can also have fire-resistant or chemical resistant properties. Triangular and delta-shaped knobs also come under this category.
Multi-armed: These clamping knobs have two or three arms arranged in a fan shape round a central stud. They are used for tap-type turning or clamping operations and come in different materials like steel, reinforced plastic, metal, etc.
Miscellaneous shapes: Various other shapes like the round, knurled type, omega or two-armed, hole-through with multi-lobes etc are also available in the materials mentioned earlier.
All knobs come with threaded inserts which can be fitted to your handle or lever. The specifications of thickness, material and diameter must be accurately provided to the manufacturer or retailer to ensure that you get the best fit. Most of them have sales catalogs, on-line catalogs or brochures to help you make the best choice.
Depending on your budget and style preferences, you can choose the clamping knobs that best fit your requirements.
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