GB/T 34635-2017 Flange connections

GB/T 1804-2000 General tolerances for linear and angular dimensions without individual tolerance indications GB/T 3452.2-2007 Fluid power systems—O-rings—Part 2:Quality acceptance criteria GB/T 70.1-2000 Hexagon socket head cap screws GB/T 70.1-2008 Hexagon socket head cap screws GB/T 97.1-2002 Plain washers—Product grade A 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 3098.1-2000 Mechanical properties of fasteners—Bolts, screws and studs GB/T 3098.1-2010 Mechanical properties of fasteners—Bolts,screws and studs GB/T 3098.2-2000 Mechanical properties of fasteners—Nuts—Coarse thread GB/T 3098.2-2015 Mechanical properties of fasteners—Nuts GB/T 3141-1994 Industrial liquid lubricants—ISO viscosity classification GB/T 5783-2000 Hexagon head bolts—Full thread GB/T 5783-2016 Hexagon head bolts—Full thread GB/T 6170-2000 Hexagon nuts,style 1 GB/T 6170-2015 Hexagon nuts,style 1 GB/T 7631.2-2003 Lubricants,industrial oils and related products(class L)—Classification—Part 2:Family H(Hydraulic systems) GB/T 10125-1997 Corrosion tests in artificial atmospheres—Salt spray tests GB/T 10125-2012 Corrosion tests in artificial atmospheres—Salt spray tests GB/T 10125-2021 Corrosion tests in artificial atmospheres—Salt spray tests GB/T 3098.2-2025 Mechanical properties of fasteners—Part 2:Nuts GB/T 5783-2025 Fasteners—Hexagon head bolts—Full thread GB/Z 131-2025 Sharing economy—General trustworthiness and safety requirements for digital platform