Home / Standards / GB/T 28253-2025 GB/T 28253-2025 Active Thread forming tap 挤压丝锥 Standard Type GBT ICS 25.100.50 CCS J41 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