)UNC：粗牙系列(Coarse-Thread Series)；UNF：细牙系列(Fine-Thread Series)；UNEF：超细牙系列(Extra-Fine-Thread Series)；UNS：特殊螺距系列(Selected Combinations和 Other Threads of Special Diameters, Pitches, and Lengths of Engagement)；另外...
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extra fine thread series 特细螺纹级
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