Constant Force Springs

A constant force spring is a flat strip of stainless or carbon steel tightly wound into a coil. When pulled, this constant tension spring delivers nearly uniform tension from start to finish, unlike ordinary coil springs, which get stiffer as they stretch. This steady force makes constant force spring applications ideal for tools and systems that require smooth, controlled motion or balanced lifting. Our constant force springs cover a broad range of designs. Models vary by end attachment — such as T-tab, round-hole, or double-hole mounts — to suit different installation styles. Other options include crimp or bent-over ends for guided or electrical applications, as well as keyhole designs for quick-release assembly. Specialised versions are also available, including perforated types for high-speed or long-stroke movement and non-magnetic options for use in precision electronic or medical equipment. Compact, durable, and customisable in force and size, our springs with constant force are used in adjustable desks, printer carriages, sliding panels, and automation systems to ensure smooth, consistent performance over long service life.