This standard specifies the requirements for the design and performance of threaded pipe fittings in malleable cast iron. These fittings are for general purposes for the transmission of fluids and gases up to the limits of pressure and temperature specified in this standard. They are intended for the connection of elements threaded in accordance with ISO 7-1, sizes 1/8 to 6. For use in conditions outside the pressure and temperature limits specified, reference shall be made to the manufacturer.