Home / Standards / GB/T 4390-2008 GB/T 4390-2008 Active Wrench openings - Tolerances for general use 扳手开口和扳手孔 常用公差 Standard Type GBT ICS 25.140.30 CCS J47 Status 现行 Issue Date 2008-12-30 Implementation 2009-09-01 Responsible Dept 中国轻工业联合会 Drafting Unit 中国轻工业联合会