M6*0.75-7H怎么理解?

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M6*0.75-7H怎么理解?
x)52375xdg m//I*)_`g_y|Z>ߴev>ߵF 1dWy@%

M6*0.75-7H怎么理解?
M6*0.75-7H怎么理解?

M6*0.75-7H怎么理解?
螺纹直径*螺距-精度等级