PRESTO is a high-carbon tool steel containing 1.40% chromium and is moderately deep hardening. It is made to tool-steel-quality standards and was developed to meet the exacting demands of bearing manufacturers for a clean steel of uniform microstructure. It is used in a wide range of bearing applications including high-performance aircraft bearings and other high-load applications where high-quality steel is required. This datasheet provides information on composition, physical properties, hardness, and elasticity. It also includes information on corrosion resistance as well as forming, heat treating, machining, and surface treatment. Filing Code: TS-407. Producer or source: Carpenter.