There are two common forms of such bearings: NN30/W33, NN30K/W33 two series of bearing inner ring with ribs, separable outer ring;
常用的此类轴承有两种形式：NN30/W33、NN30K/W33两个系列轴承内圈带挡边，外圈可分离；
DAC series wheel bearing is a double row angular contact ball bearing incorporating an integral outer ring and two separable inner rings which is available with seals or without seals.
DAC系列轮毂轴承是由一个整体外圈和两个可分离内圈组成的双列角接触球轴承，有带密封圈和不带密封圈两种结构。
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