Causes and Solutions of Hexagon Bolts Locking
2022-03-02
Causes and Solutions of Hexagon Bolts Locking
Stainless steel outer hexagon bolt is a very common fastener. If it is locked during use, it will inevitably bring trouble to the construction personnel.
There is a deflection angle of the thread fit, causing the bolt to lock
1. The fit of the bolt and the nut is a clearance fit, and the fit requirements meet a certain standard range. Therefore, when the internal and external threads are matched, if the central axis is not on the same straight line, the contact surface of the internal and external threads is reduced or inclined.
2. When locking, if the force is uneven or inclined, the central axis of the bolt and the nut will also be inclined, so that the acting surface of the bolt and the thread cannot be in good contact, and the surface force is transformed into a point force, or each time The force on a unit surface increases.
3. The larger the deflection angle of the bolt and the nut, the smaller the force-bearing area of the thread fit will lead to damage to the tooth pattern and cause the phenomenon of locking.
Excessive locking force leads to thread locking
4. When locking the nut, the locking force should be larger than the friction force of the bolt itself, so that the nut can be rotated. As the nut rotates down the thread, it causes the bolt to stretch under the influence of the reaction force. If the bolt stretches beyond a certain elastic range, it will cause deformation and lock the thread.
5. The bolt will generate heat due to friction during the rotation process. The heat and pressure will destroy the coating on the surface of the bolt, causing the tooth pattern to block. The greater the locking force, the more heat is generated, and the tooth pattern is just jade. Blocked and locked.
6. After understanding the reasons for the locking of stainless steel outer hexagon bolts, we can take targeted solutions. When locking, it is necessary to maintain the verticality of the central axis of the bolt and the nut and the locked surface, reduce the deflection angle, use a torque wrench, set the torque value, and ensure that the torque is controlled within a safe range.
Stainless steel outer hexagon bolt is a very common fastener. If it is locked during use, it will inevitably bring trouble to the construction personnel.
There is a deflection angle of the thread fit, causing the bolt to lock
1. The fit of the bolt and the nut is a clearance fit, and the fit requirements meet a certain standard range. Therefore, when the internal and external threads are matched, if the central axis is not on the same straight line, the contact surface of the internal and external threads is reduced or inclined.
2. When locking, if the force is uneven or inclined, the central axis of the bolt and the nut will also be inclined, so that the acting surface of the bolt and the thread cannot be in good contact, and the surface force is transformed into a point force, or each time The force on a unit surface increases.
3. The larger the deflection angle of the bolt and the nut, the smaller the force-bearing area of the thread fit will lead to damage to the tooth pattern and cause the phenomenon of locking.
Excessive locking force leads to thread locking
4. When locking the nut, the locking force should be larger than the friction force of the bolt itself, so that the nut can be rotated. As the nut rotates down the thread, it causes the bolt to stretch under the influence of the reaction force. If the bolt stretches beyond a certain elastic range, it will cause deformation and lock the thread.
5. The bolt will generate heat due to friction during the rotation process. The heat and pressure will destroy the coating on the surface of the bolt, causing the tooth pattern to block. The greater the locking force, the more heat is generated, and the tooth pattern is just jade. Blocked and locked.
6. After understanding the reasons for the locking of stainless steel outer hexagon bolts, we can take targeted solutions. When locking, it is necessary to maintain the verticality of the central axis of the bolt and the nut and the locked surface, reduce the deflection angle, use a torque wrench, set the torque value, and ensure that the torque is controlled within a safe range.
Previous:Why hex nuts are most commonly used
