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JB/T70 4 7标准中对内径 60mm以下和 60mm以上的振动加速度技术条件规定“宽严程度”不等效。同时双面密封深沟球轴承标准明显宽于基本型深沟球轴承
JB / T704 7 standards for the inner diameter of 60mm and below the vibration acceleration of 60mm or more technical conditions that “strict degree” is not equivalent. At the same time double-sided sealed deep groove ball bearings standard significantly wider than the basic deep groove ball bearings