adjustable

Adjustable describes a component or system that can be changed to fit different conditions or requirements. An adjustable part alters dimensions, position, angle, or other properties, typically using a repeatable mechanism that can be set and securely locked. Adjustability is a common design goal across industries because it increases compatibility, ergonomics, and versatility.

The term is formed by adding the suffix -able to adjust, meaning capable of being adjusted.

Common applications include furniture (adjustable chair height or backrest), clothing and accessories (adjustable straps and buckles), hardware and machinery (sliding plates, adjustable clamps, threaded fasteners), optics and electronics (adjustable focus, brightness, or gain), and medical equipment (adjustable beds, stands, and supports). Mechanisms used to achieve adjustability include screws and threads, slotted guides, detents and springs, rack-and-pinion, cams, clamps, and quick-release levers.

Practical considerations include the range and precision of adjustment, load and stability under use, durability, and ease of operation. Improper or excessive adjustment can impair performance or safety, so many adjustable parts include locking features or calibration procedures.

Adjustable components reflect a broader trend toward modularity and personalization in design, enabling products to serve diverse users and tasks without requiring separate specialized versions.