To establish recommended hole size for use with protruding ad mec threaded fasteners primarily used on propulsion equipmen@ and provide the recommended positional tolerance foruse with these holes. Application: The data for hole sixes and the positional tolerances provided in this document are suitable for protruding head fasteners based on the dimensional data in MA1518 for sixes 3 thru 20 mm nominal diameter@ and with a strength class less than 1250 MPa