doorknobs

A doorknob is a type of door hardware that operates a latch or lock when turned. It consists of a knob mounted on a spindle connected to a latch bolt inside the door, which retracts the bolt to open the door. Doorknobs are typically paired with a latch mechanism, but many doors also use lever handles, which can be easier to operate for some users.

Operation and types commonly include a simple turn-to-release knob, a privacy knob with a lock for bedrooms or bathrooms, and passage or dummy knobs used on doors that do not require a latch. In addition to decorative finishes, doorknobs may be part of a lockset and include features such as anti-pick pins, privacy mechanisms, or keyed entry.

Materials and finishes vary widely. Doorknobs are made from metals such as brass, bronze, stainless steel, or zinc alloys, and may be finished in polished, brushed, or matte tones. Other materials include ceramic, glass, or durable plastics, often chosen for aesthetics or corrosion resistance. Finishes range from brass and chrome to nickel, bronze, and black or bronze tones to suit architectural styles.

History and standards: contemporary doorknobs became common with mass production in the 19th and 20th centuries, evolving from earlier latch mechanisms. Standards influence dimensions, backset (commonly about 2 3/8 inches or 60 mm, or 2 3/4 inches), door thickness, and mounting screw alignment to ensure compatibility with standard doors and frames.

Accessibility and security: traditional doorknobs can be harder to operate for some users, leading to widespread use of lever handles for accessibility. Privacy and passage knobs provide different levels of security, and installation should comply with building codes and local requirements.

Installation and maintenance: proper alignment with the strike plate, secure mounting screws, and occasional lubrication of moving parts help maintain smooth operation and durability. Regular cleaning prevents residue buildup and corrosion.