SPRING BAR

In watchmaking, the spring bar is a small cylindrical metal rod, generally fitted with spring-loaded ends, used to attach the bracelet / strap between the lugs of the watch case. Its retractable ends engage into holes drilled inside the lugs, securing the strap while allowing it to be removed. There are classic spring bars, telescopic spring bars, and pump-style models for metal bracelet. A discreet but essential component, the spring bar determines the security of the strap: a spring bar with an unsuitable diameter or length risks giving way and causing the drop (impact) of the watch. Its replacement, a common External parts (case, dial, hands) operation, is carried out using a specific tool called a spring bar tool or a fork-shaped tool. The diameter of the Spring bar and the Lug width determine the compatibility between a given Case and Bracelet / Strap, which explains the standardization of these dimensions.

Useful link:

– The Case

– Bracelets / Straps and clasps