Knobs

A knob is a rounded or contoured handle designed for gripping to operate a mechanism. Knobs are distinguished from levers by their shape and the grip action required. They are widely used on doors and drawers to actuate latches, as well as on appliances and electronic equipment to control functions. They can be decorative or functional and may incorporate a set screw or threaded shank.

Door knobs come in various styles, including passage, privacy, storeroom, and dummy variants. Cabinet and drawer knobs are small decorative fittings that provide a grip for opening hardware. Rotary control knobs are found on appliances, electronics, and instruments, where turning or twisting the knob selects settings. Some knobs include indicators, detents, or indexing so the user can identify positions.

Materials and finishes vary widely: wood, metal (such as brass and stainless steel), ceramic, glass, and durable plastics. Common forms include ball knobs, mushroom knobs, and cup knobs. Design considers ergonomics, grip texture, and inertia. For control knobs, tactile features, legends, and non-slip surfaces aid usability. Mounting methods include through-bolts, set screws, or threaded posts, and some require compatible shafts or adapters.

Historically, knobs have evolved with security and accessibility needs. In many settings, lever handles are preferred for accessibility, while high-security doors may use locked knobs. Careful selection involves balancing aesthetics, function, and user needs.

Maintenance is simple: keep knobs clean with mild soap and a damp cloth, check for looseness and tighten mounting hardware as needed. Replace worn or damaged knobs to maintain function and security. Avoid harsh cleaners that can degrade finishes.