The main reasons for the failure of thread pair during fitting process is analyzed in this paper. Thus the fitting quality of bolt and nut can been increased.
从理论上、实践上分析了螺纹副在装配过程中失效的主要因素，从而达到提高螺栓、螺母的装配质量。
2
Bite type fitting consists of three parts: body, cutting ring and nut.
卡套式管接头由三部分组成：接头体、卡套、螺母。
3
The flared end is then drawn up by the tube nut so the inside surface is tightly secured against the ball seat of the fitting.