GB/T 3229-2018 Assembly tools for screws and nuts—Dimensions and torque testing of drive ends for hand and machine-operated screwdriver bits and connecting parts (English Version)
2018GB/T 3229-2018 Assembly tools for screws and nuts—Dimensions and torque testing of drive ends for hand and machine-operated screwdriver bits and connecting parts
2008GB/T 3229-2008 Assembly tools for screws and nuts.Drive ends for hand and machine-operated screwdriver bits and connecting parts.Dimensions,torque testing
2000GB/T 3229-2000 Assembly tools for bolts and screws-Hexagon drive ends for machine-operated screwdriver bits