bearing without outer-ring
bearing without outer-ring;inner ring with cage and roller assembly无外圈轴承（无外圈有保持架的轴承，用于径向尺寸受限制的部件中）
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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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