In the oxyfuel welding and cutting industry@ every equipment manufacturer has its own system for designating the size of oxyfuel nozzles for cutting@ welding@ and heating/brazing. These systems are based on a variety of different nozzle features and in many cases are completely arbitrary. In any case@ it is currently impossible to identify a nozzle by model number for a given manufacturer and cross reference it to a different manufacturer to obtain like performance and size@ i.e.@ there is no commonality among manufacturers to identify like nozzles for performance and use. The intent of this publication is to provide a system for uniform identification of cutting@ welding@ and heating/brazing nozzles. This publication describes in detail the information that the equipment manufacturers should permanently mark on their oxyfuel cutting@ welding@ and heating/brazing nozzles. This system of marking provides a common information base that the operator can rely on to identify nozzle performance from one manufacturer to another. The overall intent of this system is to provide a common identification system that will result in the safe operation of oxyfuel nozzles@ i.e.@ operators will know they are using the correct nozzle for the job being performed. This standard makes the use of the International System of Units (SI). Safety and health issues are beyond the scope of this standard and@ therefore@ are not fully addressed herein. Some safety and health information is to be provided with the product as described in 4.2@ 5.2@ and 6.2. Safety and health information is available from other sources@ including@ but not limited to@ ANSI Z49.1@ Safety in Welding@ Cutting@ and Allied Processes@ applicable state and federal regulations or@ where required@ applicable ISO standards@ and local code requirements.