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137225266 發(fā)表于 2020-11-15 14:01 有樣圖嗎?是螺孔還是螺柱 |
美制UNC螺紋,大徑2.845,每英寸牙數(shù)40牙,底孔2.3,牙型角60°,螺距0.635 |
螺孔,美制UNC的,每英寸40牙。 |
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