The term “fasteners” includes a wide range of threaded and non threaded bolts, screws, rivets and pins which all require specific raw material and production processes. Good metallographic quality control for raw material and production is essential to ensure quality fasteners. The metallographic checks are mainly for mechanical and thermal damages due to production and subsequent heat treatment. Interpretation of structure and defects requires some experience as the range of materials and shapes of fasteners is very wide. Specific problems during the metallographic preparation are cutting and mounting, which can be overcome by using various helpful tools. The grinding and polishing procedure depends on the fastener material to be prepared and can be carried out on automatic equipment with a three or four step method.