Home / Standards / GB/T 21013-2025 GB/T 21013-2025 Active Machine tool—Hub flangs for plain grinding wheels 机床 紧固平砂轮用砂轮卡盘 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