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外螺纹标注方式是什么?这种标注方式有什么特点?
3. 公差带代号:用于指示螺纹的精度等级。 4. 旋合长度代号:分为短、中、长三种旋合长度,分别用字母“S”“N”“L”表示。 例如,“M20×2 - 6g ...
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