Screw locking
For permanent joints
Safety is the priority: U-NUT® self-locking nuts ensure reliable screw connections – even under extreme conditions. The nut locking function is integrated directly in the nut. This means that the possibility of the screw connection loosening is virtually excluded.
Plus factors
U-NUT® nuts are optimally secured: The friction lock on the thread is highly effective and prevents the connection from loosening.
U-NUT® self-locking nuts are made to meet the most diverse requirements. They are available in many dimensions and designs.
Whether steel or stainless steel: We manufacture U-NUT® self-locking nuts in a variety of materials.
U-NUT® self-locking nuts are suitable for high rotation speeds and alternating directions of rotation.
Uniform installation torque and reliable reuse of screw-fastenings assure your processes.
Method and principle
The U-NUT® self-locking nut has an integrated A2 stainless steel lock ring. This lock ring functions as a spring on the thread flanks during and after assembly and exerts a clamping force of the nut on the thread.
Thus, the resulting friction torque generated in reaction to the pitch and reactive force is greater than the loosening torque that occurs in use. This results in a friction lock that effectively secures the bolted connection, even at high vibration.
The U-NUT® is used wherever failure of the screw connection would be critical or where screw-locking is always required. The versatility of the U-NUT® makes it suitable for either conventional bolted joints in accordance with VDI 2230, or applications with shorter clamping lengths and unclear fastening parameters.
The lock ring guarantees a secure connection capable of passing the NAS 3350 American National Aerospace Standard test.
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