Låsemomentet

Låsemomentet, or locking torque, refers to the peak torque a mechanical fastener experiences as it transitions from elastic deformation to plastic deformation during tightening. This critical point signifies the limit of elastic integrity for the bolt and nut or the threaded hole. Beyond the låsemoment, further tightening will cause permanent stretching of the bolt or damage to the threads, reducing the fastener's ability to maintain its clamping force.

Understanding låsemoment is crucial in engineering and manufacturing for ensuring the structural integrity and safety of assemblies. Exceeding this torque can lead to premature failure of the joint. Conversely, not reaching a sufficient låsemoment means the fastener may not be adequately preloaded, compromising its ability to resist loosening under vibration or load.

The låsemoment is influenced by several factors, including the fastener's material properties, its diameter and thread pitch, and the coefficient of friction between the mating surfaces. Lubrication, for instance, can significantly reduce the friction, thereby lowering the torque required to reach the låsemoment for a given clamping force. Therefore, precise control over tightening procedures, often involving torque wrenches or angle-controlled tightening, is essential to operate within the desired elastic range and achieve reliable joint performance.