Home / Standards / GB/T 800-2020 GB/T 800-2020 Active Countersunk head double nib bolts 沉头双榫螺栓 Standard Type GBT ICS 21.060.10 CCS J13 Status 现行 Issue Date 2020-11-19 Implementation 2021-06-01 Responsible Dept 中国机械工业联合会 Drafting Unit 中国机械工业联合会