GB/T 1231-1991 Specifications of high strength bolts with large hexagon head, large hexagon nuts, plain washers for steel structures

GB 1231-1984

GB/T 1231-2006 Specifications of high strength bolts with large hexagon head,large hexagon nuts,plain washers for steel structures

GB/T 3077-1999 Alloy structure steels GB/T 3077-2015 Alloy structure steels GB/T 699-1999 Quality carbon structural steels GB/T 699-2015 Quality carbon structure steels 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 3098.2-2025 Mechanical properties of fasteners—Part 2:Nuts GB/T 196-2003 General purpose metric screw threads—Basic dimensions GB/T 196-2025 General purpose metric screw threads—Basic dimensions GB/T 197-2003 General purpose metric screw threads—Tolerances GB/T 197-2018 General purpose metric screw threads—Tolerances GB/T 2-2001 Fasteners—Ends of parts with external thread GB/T 2-2016 Fasteners—Ends of parts with external thread GB/T 3103.1-2002 Tolerances for fasteners—Bolts, screws, studs and nuts GB/T 3103.3-2000 Tolerances for fasteners—Plain washers GB/T 3103.3-2020 Tolerances for fasteners—Plain washers GB/T 5779.1-2000 Fasteners—Surface discontinuities—Bolts,screws and studs for general requirements GB/T 5779.2-2000 Fasteners—Surface discontinuities—Nuts GB/T 228-2002 Metallic materials—Tensile testing at ambient temperature GB/T 228.1-2010 Metallic materials—Tensile testing—Part 1:Method of test at room temperature GB/T 228.1-2021 Metallic materials—Tensile testing—Part 1:Method of test at room temperature GB/T 228.2-2015 Metallic materials—Tensile testing—Part 2:Method of test at elevated temperature GB/T 228.3-2019 Metallic materials—Tensile testing—Part 3:Method of test at low temperature GB/T 228.4-2019 Metallic materials—Tensile testing—Part 4:Method of test in liquid helium GB/T 229-1994 Metallic materials—Charpy notch impact test GB/T 229-2007 Metallic materials—Charpy pendulum impact test method GB/T 229-2020 Metallic materials—Charpy pendulum impact test method GB/T 230.1-2004 Metallic Rockwell hardness test—Part1:Test method(scales A、B、C、D、E、F、G、H、K、N、T) GB/T 230.1-2009 Metallic materials—Rockwell hardness test—Part 1:Test method(scales A、B、C、D、E、F、G、H、K、N、T) GB/T 230.1-2018 Metallic materials—Rockwell hardness test—Part 1:Test method GB/T 230.2-2002 Metallic rockwell hardness test—Part 2:Verification and calibration of hardness testers(scales A,B,C,D,E,F,G,H,K,N,T) GB/T 230.2-2012 Metallic materials—Rockwell hardness test—Part 2:Verification and calibration of testing machines GB/T 230.2-2022 Metallic materials—Rockwell hardness test—Part 2:Verification and calibration of testing machines and indenters GB/T 230.3-2002 Metallic rockwell hardness test—Part 3:Calibration of hardness reference blocks(scales A,B,C,D,E,F,G,H,K,N,T) GB/T 230.3-2012 Metallic materials—Rockwell hardness test—Part 3:Calibration of reference blocks(scales A,B,C,D,E,F,G,H,K,N,T) GB/T 230.3-2022 Metallic materials—Rockwell hardness test—Part 3:Calibration of reference blocks GB/T 4340.1-1999 Metallic materials—Vickers hardness test—Part 1:Test method GB/T 4340.1-2009 Metallic materials—Vickers hardness test—Part 1:Test method GB/T 4340.1-2024 Metallic materials—Vickers hardness test—Part 1:Test method GB/T 4340.2-1999 Metallic vickers hardness test—Part 2:Verification of hardness testers GB/T 4340.2-2012 Metallic materials—Vickers hardness test—Part 2:Verification and calibration of testing machines GB/T 4340.2-2025 Metallic materials—Vickers hardness test—Part 2:Verification and calibration of testing machines GB/T 4340.3-1999 Metallic vickers hardness test—Part 3:Calibration of hardness reference blocks GB/T 4340.3-2012 Metallic materials—Vickers hardness test—Part 3:Calibration of reference blocks GB/T 4340.3-2025 Metallic materials—Vickers hardness test—Part 3:Calibration of reference blocks GB/T 4340.4-2009 Metallic materials—Vickers hardness test—Part 4:Tables of hardness values GB/T 4340.4-2022 Metallic materials—Vickers hardness test—Part 4:Tables of hardness values GB/T 1237-2000 Designation system for fasteners GB/T 90.1-2002 Fasteners—Acceptance inspection GB/T 90.1-2023 Fasteners—Acceptance inspection GB/T 90.2-2002 Fasteners—Marking and packaging GB/T 90.3-2010 Fasteners—Quality assurance system GB/T 1228-1991 High strength bolts with large hexagon head for steel structures GB/T 1228-2006 High strength bolts with large hexagon head for steel structures GB/T 1229-1991 High strength large hexagon nuts for steel structures GB/T 1229-2006 High strength large hexagon nuts for steel structures GB/T 1230-1991 High strength plain washers for steel structures GB/T 1230-2006 High strength plain washers for steel structures