This specification prescribes requirements for carbon steel covered electrodes for shielded metal arc welding of carbon and low alloy steels. Note: The values stated in U.S. customary units are to be regarded as the standard. The SI units are given as equivalent values to the U.S. customary units. The published sizes and dimensions in the two systems are not identical@ and for this reason conversion from a published size or dimension in one system will not always coincide with the published size or dimension in the other. Suitable conversions@ encompassing published sizes of both@ can be made@ however@ if appropriate tolerances are applied in each case.