Home / Standards / GB/T 1231-2006 GB/T 1231-2006 Abolished Specifications of high strength bolts with large hexagon head,large hexagon nuts,plain washers for steel structures 钢结构用高强度大六角头螺栓、大六角螺母、垫圈技术条件 Standard Type GBT ICS 21.060.20;21.060.10;21.060.30 CCS J13 Status 废止 Issue Date 2006-03-27 Implementation 2006-11-01 Responsible Dept 中国机械工业联合会 Drafting Unit 中国机械工业联合会