A subassembly (10) of a vehicle safety system comprising a tubular casing (20) and comprising a fastening element (30) that includes at least one fastening hole (13) and a peripheral portion (31) curved at least in portions, wherein the peripheral portion (31) is connected at least at one connecting point (11) to the tubular casing (20), wherein the peripheral portion (31) includes at least one breakthrough (40) and that between the peripheral portion (31) and the casing (20) a coating passage (17) is formed at least in portions, wherein at least one of the tubular casing (20) and the fastening element (30) includes an anti-corrosion layer at least in portions on its exposed surface (21, 32).