Interchanging aerospace bearings is a speciality of AHR International. Common interchanges such as NSN, AN, EN, NAS, NSA, MS, M etc are more or less straight forward, however, many of the older RHP and SKF sizes have unique imperial dimensions which cause problems. Not only do we retain extensive experience in this area but also we are fully aware of the restrictions in many areas and certain QPL (qualified parts lists for particular aircraft, world-wide). In many instances bearings go out of manufacture whist they are still in service. In these cases AHR can offer a "best alternative" service which gives you one or more alternatives with which to approach your quality and design staff.