Home / Standards / GB/T 4681-2025 GB/T 4681-2025 Active External cylindrical centreless grinding machines—Testing of the accuracy 无心外圆磨床 精度检验 Standard Type GBT ICS 25.080.50 CCS J55 Status 现行 Issue Date 2025-10-31 Implementation 2026-05-01 Responsible Dept 中国机械工业联合会 Drafting Unit N/A