303 Stainless Steel Round Bar is an excellent machining alloy that provides a clean, bright finish. Corrosion resistance to atmospheric conditions, chemicals, acids and foods. Chrome-Nickel, Non-Hardening, Austenitic (Non-Magnetic). Bearing Shaft Quality shafts have a smooth and undersized finish for application of bearings. 303 Bearing shaft quality will have 32RMS surface finish to allow a more smooth finish and round bar which can help the life of the shaft. 303 Bearing Shafts are ground to a minus 0.0005 inch to minus 0.0015 inch tolerance under the dimension to give a slip fit for bearing applications.