是摩擦。这是一种应用更广泛的防止松脱的方法，这种方法在螺杆副产生的外力之间产生一种变化的正压力，以产生螺杆副能够防止摩擦的相对转动。这种正压力可以通过向轴向或同时向两个方向挤压螺杆对来实现。如采用弹性垫圈、钢接头套、自锁螺母和尼龙插入锁紧螺母。这种防松方法对于螺母的拆卸更加方便。但是，在冲击、振动和变载荷的情况下，螺栓的松动会导致预紧力在开始时减小。随着振动次数的增加，预紧力的损失会慢慢增大，更终导致螺母松动，螺杆连接失效。
The first is friction. This is the most widely used method to prevent loosening. This method produces a positive pressure between the external forces generated by the screw pair, so as to produce the screw pair to prevent the relative rotation of friction. This positive pressure can be achieved by extruding the screw pair in axial direction or in both directions at the same time. Such as elastic washer, steel joint cover, self-locking nut and nylon insert lock nut. This method is more convenient for nut disassembly. However, in the case of impact, vibration and variable load, the loosening of bolts will lead to the reduction of preload at the beginning. With the increase of vibration times, the loss of preload will increase slowly, which will eventually lead to the loosening of nuts and the failure of screw connection.
第二种方法是机械锁定。螺杆副的相对转动直接受制动器的限制。如采用开口销、钢丝和止动垫圈。由于止动器上没有预紧力，防松的止动器只有在螺母松回到停止位置时才会起作用。因此，这种方法实际上并不能防止塞子松动，而是防止其脱落。
The second method is mechanical locking. The relative rotation of the screw pair is directly limited by the brake. Such as cotter pin, steel wire and stop washer. Since there is no preload on the stop, the stop will only work if the nut is loosened back to the stop position. Therefore, this method does not prevent the plug from loosening but from falling off.
第三种方式是铆接和打孔。拧紧后采用冲头、焊接、粘接等方法使螺纹副失去运动副的特性，成为不可拆卸的连接。这种方法的缺点是螺栓只能使用一次，拆卸非常困难。
The third way is riveting and punching. After tightening, punch, welding, bonding and other methods are used to make the thread pair lose the characteristics of the moving pair and become a non detachable connection. The disadvantage of this method is that the bolt can only be used once, so it is very difficult to disassemble.
四是结构性松动。是采用螺纹对自身的结构，即唐的螺纹松动方式。
Fourth, structural loosening. It adopts thread to its own structure, that is, Tang's thread loosening way.
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