Spænder

Spænder is the Danish plural noun for fasteners used to close and adjust the length of a strap, belt or band. The singular form is spænde. In everyday use, spænder appear on clothing such as belts and shoes, on bags and backpacks, on harnesses and sporting equipment, and on various kinds of outdoor gear. Their primary function is to secure two ends of a strap at a chosen length and to allow quick release when needed.

A spænde typically consists of a frame or housing, a movable tongue or locking element, and a bar or slot for the strap to pass through. The strap is threaded through the frame and the tongue sits in a hole or notch to hold the adjustment. Variants include metal buckles with a fixed frame and tongue, as well as plastic side-release buckles and other locking mechanisms used on backpacks, luggage straps, or protective gear.

Materials vary widely. Common choices are metal (such as brass, steel or zinc alloys) and durable plastics, sometimes with decorative finishes. Finish, weight, and strength influence suitability for different uses. Some compétent spænder are designed to withstand high loads or harsh environments, such as climbing gear, equestrian equipment or safety harnesses, and must meet relevant safety or industry standards.

Etymology: the word spænde and its plural spænder are of Germanic origin, related to concepts of binding, tightening and stretching.

See also: buckle, fastener, clasp.