AASHTO M 169-20 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. Grades of steel are identified by grade numbers or by chemical composition. Note: A guide for the selection of steel bars in contained in ASTM A 400.