Abstract：In order to study the influence of various factors on locking torque descent rate of GH738 self-locking nut, targeted improvement measurements and group tests were taken under the combined effect of three factors, namely, deformation form, thickness and deformation amount of lock area. The results show that the locking torque can be increased by adopting three-point deformation process, increasing the thickness and deformation amount of the lock area. For MJ8 nuts, after improvement the descent scale of locking torque decreases from 43.2% to 17.9%, but for MJ6 and below nuts, the descent rate of locking torque is susceptible to the variation of lock area thickness when adopting threepoint deformation process, which is unstable.
2020, 
