Home / Standards / GB/T 6312-2022 GB/T 6312-2022 Active Micrometer for measuring pipe wall thicknesses 壁厚千分尺 Standard Type GBT ICS 17.040.30 CCS J42 Status 现行 Issue Date 2022-07-11 Implementation 2023-02-01 Responsible Dept 中国机械工业联合会 Drafting Unit N/A