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unified extra fine thread
avia. 统一标准超细牙螺纹
mech. 统一特细螺纹
unified extra-fine thread
dril. 统一标准特细螺纹
earth.sc. 统一标准超细螺纹
oil 统一标准特细牙螺纹
tech. 统一标准超细牙螺纹