以下为句子列表：
英文: Insert ball bearing unit is consisted of a double sealed, single row bearing and one of various types of housings (cast iron or stamping steel housing).
中文: 带座外球面球轴承由一个双面密封且外圈具有球形外截面的宽内圈深沟球轴承和一个轴承座（铸铁座或钢板冲压座）两部分组成。
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英文: Since the bearing is designed to have the appropriate internal axial clearance, there is no need for pre-load adjustment (dimensional adjustment for spacers ), but it's necessary for single row bearing assembly.
中文: 由于轴承设计有恰当的轴向游隙，因而无需进行游隙调整（调整垫片尺寸），而装配单列需进行游隙调整。
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