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

Standard No.

GB/T 1231-2006

Language

Chinese, Available in English version

Release Date

2006

Published By

General Administration of Quality Supervision, Inspection and Quarantine of the People‘s Republic of China

Latest

GB/T 1231-2006

Replace

GB/T 1231-1991

Scope

This standard specifies the technical requirements, test methods, inspection rules, signs and packaging of high-strength large hexagon head bolts, large hexagon nuts, washers and connecting pairs for steel structures. This standard applies to railway and highway bridges, boiler steel structures, industrial plants, high-rise civil buildings, tower mast structures, hoisting machinery and other steel structures with friction-type high-strength bolt connections.

GB/T 1231-2006 Referenced Document

• GB/T 196 General purpose metric screw threads--Basic dimensions
• GB/T 197 General purpose metric screw threads—Tolerances*， 2018-03-15 Update
• GB/T 2 Fasteners.Ends of parts with external thread*， 2016-02-24 Update
• GB/T 228 Metallic materials--Tensile testing at ambient temperature
• GB/T 90.1 Fasteners—Acceptance inspection*， 2023-05-23 Update

GB/T 1231-2006 history

• 2006 GB/T 1231-2006 Specifications of high strength bolts with large hexagon head ，large hexagon nuts，plain washers for steel structures
• 1991 GB/T 1231-1991 Specifications of high strength bolts with large hexagon head, large hexagon nuts,plain washers for steel structures