GB/T 16825.1 Metallic materials—Calibration and verification of static uniaxial testing machines—Part1:Tension/compression testing machines—Calibration and verification of the force-measuring system*, 2022-10-14 Update
GB/T 196 General purpose metric screw threads--Basic dimensions
GB/T 197 General purpose metric screw threads—Tolerances
GB/T 228.1 Metallic materials—Tensile testing—Part 1: Method of test at room temperature
GB/T 5276 Fasteners.Bolts, screws, studs and nuts.Symbols and descriptions of dimensions
GB/T 6394 Determination of estimating the average grain size of metal
NB/T 20003.4 Non-destructive testing of nuclear island machinery and equipment in nuclear power plants Part 4: Penetration testing
NB/T 20008.12 Other materials for pressurized water reactor nuclear power plants Part 12: Forged and rolled rods for bolts and nuts of grade 1, 2 and 3
GB/T 41157.4-2022 history
2022GB/T 41157.4-2022 Fasteners for nuclear power plants—Part 4:Nuts made of corrosion-resistant stainless steel