Bearing with retaining shield 带防尘盖的轴承 Bearing with seals 带密封圈的轴承 Bearing with set screws in the inner ring 内圈带定位螺钉（顶丝）的轴承 ..
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They operate in an environment thick with coal dust, and problems usually start when this dust finds a route past protective seals and enters the bearing, causing it to fail prematurely.
他们经营的环境中厚与煤尘和存在的问题时，通常会开始发现这个尘埃的路线过去保护海豹和进入轴承，造成过早失败。
The bearing must be equipped with seals that are able to keep dust and water out and the grease inside the bearing.
轴承上必须有密封件，防止外部的灰尘和水分进入，也防止轴承内部的润滑油脂外漏。
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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