GB/T 12767-1991 Powder metallurgy products surface roughness—Parameters and their values

GB 6061 GB/T 1031-1995 Surface roughness parameters and their values GB/T 1031-2009 Geometrical Product Specifications (GPS)—Surface texture:Profile method—Surface roughness parameters and their values GB/T 3505-2000 Geometrical product specifications (GPS)—Surface texture:Profile method—Terms, definitions and surface texture parameters GB/T 3505-2009 Geometrical Product Specifications (GPS)—Surface texture:Profile method—Terms,definitions and surface texture parameters GB/T 131-1993 Mechanical drawings—Surface roughness symbols and methods of indicating GB/T 131-2006 Geometrical Product Specifications (GPS)—Indication of Surface texture in technical Product documentation GB/T 6062-2002 Geometrical product specifications (GPS)—Surface texture-Profile method—Nominal characteristics of contact(stylus)instruments GB/T 6062-2009 Geometrical Product Specifications (GPS)—Surface texture:Profile method—Nominal characteristic of contact (stylus) instruments GB/Z 131-2025 Sharing economy—General trustworthiness and safety requirements for digital platform