冲压薄壁M形滚针保持架窗孔形状采用圆弧形空刀槽，可以提高产品质量，延长轴承使用寿命。
Adopting are type run-out of tool during pressing the window shape of thin thickness type M needle roller cage, the product quality can be improved & the bearing life can be extended .
上颚壁面呈弧形外突，并在该弧形外突壁面上设有观察窗开口；
The wall of the maxilla protrudes in an arc shape and the wall of the protruding arc surface is provided with an observing port;
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