Home / Standards / GB/T 28775-2021 GB/T 28775-2021 Active Synchronous belt drives—Pulley with T trapezoidal profile system 同步带传动 T型梯形齿同步带轮 Standard Type GBT ICS 21.220.10 CCS J18 Status 现行 Issue Date 2021-05-21 Implementation 2021-12-01 Responsible Dept 中国机械工业联合会 Drafting Unit N/A