Abstract: An air bag mountng system for assembling an air bag having a mounting flange with an air bag inflator and for thereafter assembling the assembled air bag and inflator with a preselected surface of an automotive vehicle comprises a module housing, and a retaining ring. The mounting flange is disposed between the retaining ring, and the module housing. The module housing has apertures therein capable of accepting projecting pins disposed about the retaining ring. The projecting pins are forced into the apertures forming a frictioned interference fit capable of holding the air bag subassembly together during manufacture of the subassembly and installation in a vehicle. Preferably, the projecting pins are hexlobular in nature.

Abstract: An improved fastening nut is disclosed which is secured to an unthreaded stud which is inserted through a central bore in the nut. The bore includes a guide and retaining splines which provides alignment guidance during sliding insertion of the stud into the bore. The guide splines preferably has an annular configuration with an inner diameter slightly larger than the diameter of the stud so that the initial insertion of the stud does not produce significant frictional resistance. The bore of the nut further includes a plurality of helical threads, preferably twin leads having equal pitch, which are disposed in the bore axially distinct from the guide and retaining splines and terminate within the bore adjacent the guide and retaining splines. The internal helical threads have a crest diameter smaller than the stud diameter and also projects radially inwardly into the bore further than the guide and retaining splines.