The degree of tightening of ordinary bolts is not clearly defined, and the force applied during locking is generally as long as the connection is tight. However, since the tension is not applied when the lock is applied, the nut is prone to loosening. To prevent loosening, the inner nut can be pressed by the outer nut by a spring washer or a double nut to prevent the two nuts from being synchronized. Rotate and relax. When the double nut is used, the inner nut needs to use the heavy-duty hex nut, and the outer nut can be the general nut. Generally, the high-strength bolt has the tension of the load-bearing type or the friction type due to the pre-tightening, and the pre-tightening force causes the contact surface. The positive stress can generate anti-torque friction resistance, so that the nut can be released without loosening, so it is not necessary to attach an anti-off device.
However, if special chucks (such as vibrating machinery or important structural positions of the car body) must be used to prevent loosening of the nut, the collect of the bolt determines the length or form of the bolt and the thread to prevent loosening. See Figure 10 for details on the cap clamp.
High-strength bolts are currently used in the automotive field. They are mainly used in the connection of the vehicle’s strength and its important parts, such as the wheel hub of the car, which plays an irreplaceable role in the safe and stable driving of the car.
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