The thesis which has been developed in Sabelt spa, has the purpose to analyse a Formula 1 safety harness, focusing on the buckle. Mainly, the harness is composed by many elements and the most interesting from an engineering point of view is the buckle. This object is used in each car, but his shape depends on the purpose. Sabelt spa provides a wide range of harnesses, from racing environment, as Formula 1, rally or endurance, to commercial vehicles. However, the structure of the harness depends on the usage because the homologation required is different. For example, following the normative imposed by the Federation International de l’Automobile (FIA), a Formula 1 harness must be used with 6, 7, 8 or 9 attachment points and the straps involved are six: two passing on the shoulders, two crossing the pelvic zone, two scraping on the crotches.