Aerospace connections is a "Level 3 Series". The material in the 5 part series is called out at a standard 316 / 316L stainless per AMS - 5653 or 5648. Aerospace orbital fittings and connections are widely used in the aerospace industry. NOTE: To download drawings for this file you can select the link to the right in the RELATED FILES box simply click the link. This will take you to where you can view the PDF or download it by clicking the download icon in the top right hand side.