This specification prescribes the requirements for classification of copper and copper-alloy electrodes for shielded metal arc welding. Classification is based on chemical composition, mechanical properties and usability of the electrodes. Additional requirements are included for manufacture, sizes, lengths, and packaging. A guide is appended to the specification as a source of information concerning the classification system employed and intended use of the electrodes. This specification makes use of both U.S. Customary Units and the International System of Units (SI). Since these are not equivalent, each system must be used independently of the other.