This specification covers cold-finished carbon and alloy steel bars produced in straight length and coil to chemical compositions. Cold-finished bars are suitable for heat treatment@ for machining into components@ or for use in the as-finished condition as shafting@ or in constructional applications@ or for other similar purposes (Note 1). Grades of steel are identified by grade numbers or by chemical composition. Note 1??A guide for the selection of steel bars is contained in ASTM A 400. Some end uses may require one or more of the available designations shown under Supplementary Requirements. Supplementary requirements shall apply only when specified individually by the purchaser. The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.