This standard specifies the basic requirements for the type, size and marking of machine taps (high performance grade and general grade) and hand taps. This standard is applicable to machine and hand taps for processing ordinary threads (GB/T 192-193, GB/T 196-197).
GB/T 3464.1-1994 history
2007GB/T 3464.1-2007 Machine and hand taps.Part 1:Plain parallel shank machine and hand taps