This standard specifies the type and size of hexagonal dies, technical requirements, performance testing and basic requirements for marking and packaging. This standard is applicable to the processing of ordinary threads (according to GB/T 191~193, GB/T 196~197), non-thread-sealed pipe threads (according to GB/T 7307-1987 "Non-thread-sealed pipe threads"), and use of threads. Sealed pipe threads (according to GB/T 7306-1987 "Pipe threads sealed with threads") and other threaded hexagonal dies.