Hexagon nuts with product grade a and B are intended for the use on the machine and facility with smooth surface and does require high precision.
级和B级的六角螺母主要使用在表面光洁，对精度要求高的机械，设备上。
Hexagon nuts with product grade a and B are intended for the use on the machine and facility with smooth surface and does require high precision.
级和B级的六角螺母主要使用在表面光洁，对精度要求高的机械，设备上。
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