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M48*1.5-LH-H7H7是什么螺纹，中经尺寸上下偏差是多少

2025-03-14 20:22:43

推荐回答（1个）

回答1：

GB197-81标准规定其外螺纹的基本偏差有:外螺纹（e,f,g,h)四种;内螺纹(G,H)二种.公差等级分别规定,如中径:外螺纹(3-9)级;内螺纹(4-8)级.
你的7H表示是内螺纹(H大写)公差等级7级精度,基本偏差为H.(包括中径与顶径).具体你可查国家标准.

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