Home / Standards / GB/T 6481-2016 GB/T 6481-2016 Active Hollow hexagonal drill rods with taperd connection for rock drilling 凿岩用锥体连接中空六角形钎杆 Standard Type GBT ICS 77.140.60 CCS H44 Status 现行 Issue Date 2016-12-13 Implementation 2017-09-01 Responsible Dept 中国钢铁工业协会 Drafting Unit N/A