*GB/T 192-1981 General purpose screw threads-Basic concepts and symbols for tooth shapes and tolerance zone
*GB/T 193-1981 General purpose screw threads--Diameters and pitches
*GB/T 196-1981 General purpose screw threads-Basic dimensions for diameter from 1 to 600mm
*GB/T 197-1981 General purpose screw threads--Tolerances and fits for diameter from 1 to 355mm
*GB/T 1047-1995 Nominal size for pipe components
*GB/T 1184-1996 Genometrical tolerancing-Geometrical tolerances for features without lndividual tolerance indications
*GB/T 2828-1987 Sampling procedures and tables for lot-by-lot inspection by attributes (Apply to inspection of successive lots or batches)
*GB/T 2829-1987 Sampling procedures and tables for periodic inspection by attributes ( Apply to inspection of stability for productive process)
*GB/T 4956-1985 Non-magnetic coatings on magnetic substrates--Measurement of coating thickness--Magnetic method
*GB/T 7306.1-2000 Pipe threads with 55 degree thread angle where pressure-tight joints are made on the threads--Part 1：Parallel internal and taper external threads
*GB/T 7306.2-2000 Pipe threads with 55 degree thread angle where pressure-tight joints are made on the threads--Part 2: Taper internal and external threads
*GB/T 9440-1988 Malleable iron castings
*GB/T 10922-1989 Gauges for pipe threads where pressure-tight joints are not made on the threads
*QB/T 3816-1999 Thickness testing method of the metal deposits for the light industrial products--Timekeeping of liquid flow method

*GB/T 3287-2000 Malleable cast iron pipe fittings