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 20003.5 Non-destructive testing of nuclear island machinery and equipment in nuclear power plants Part 5: Magnetic particle 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 41157.2-2022 history
2022GB/T 41157.2-2022 Fasteners for nuclear power plants—Part 2:Nuts made of carbon steel and alloy steel