Fastening system for metal sheet comprises bolt with threaded lower shaft and upper section which has longitudinal grooves and ribs, this section being deformed when nut is tightened

摘要

The fastening system for metal sheet (2, 3) comprises a bolt with a threaded lower shaft (8) and an upper section (7) which passes through bores (4) in the sheets to be joined. This section has longitudinal grooves and ribs and is deformed when the nut (10.2) is tightened to fix the bolt in place.