View Sample Alloy Digest Data Sheet (PDF)Since 1952, Alloy Digest has been the leading reference for materials property data on metals and alloys used throughout the world. Featuring graphs, charts and tables, these sheets give facts and figures on composition or characterization, physical and mechanical properties, heat treatment, and machinability.AISI 1340 is a carbon-manganese oil hardening steel with greater hardenability than the 1000 and 1100 steels of comparable carbon content, and with poorer machinability than the sulphurized 1100 steels. It is recommended for general engineering and machinery parts such as shafts, gears, axles, fasteners, rollers, etc.