第二，成套轴承在装配前经过严格的精密选配。不能互换使用锭脚型腔内的其它零件。

Second, the complete bearing undergoes the strict precise match before the assembly. Cannot exchange in the use spindle foot die space other components.

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NKE的通用设计(后缀ul)，主轴轴承具有轻预紧安装时成对或成套面对面或背靠背。

NKE spindle bearings of universal design (suffix UL) feature a light preload when mounted in pairs or sets either face to face or back to back.

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单列角接触球轴承通用设计（后缀为BG）和主轴轴承经常成对或成套使用。

Single row angular contact ball bearings in universal design, (suffix BG) and spindle bearings are frequently used in pairs or sets.

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