For needle roller bearings without inner ring, a suitable internal clearance is achieved by selecting the appropriate tolerance for the racewaydiameter.
对于无内圈滚针轴承，通过为滚道直径选择合适的公差，可得到合适的内部游隙。
2
SHOULDER: Defect found on rib or outer diameter; a raised edge on rib face caused by grinding wheel; raised surface at either end of outer diameterraceway.
挡肩：外径或挡肩上发现的缺陷；挡肩上由于磨床砂轮所造成的突起；在外径滚道两端的突起。
3
Large INSIDE DIAMETER: the large end of the cup raceway.