Vibration Resistance
What Causes Screw Loosening?
Screw loosening refers to the phenomenon where the fastening condition changes and the axial force of the bolt generated during tightening decreases.
The reduction in axial force can be caused by various factors, such as non-rotational loosening due to surface settling or creep, or rotational and stress-relaxation loosening caused by vibration, thermal stress, or the release of residual torsional stress.
It is important to properly select anti-loosening screws, nuts, and washers according to the usage environment.
NBK’s Anti-Loosening Components
NBK offers a range of components designed to prevent screw loosening.
Bolts with nylon patches suppress the reverse rotation of screws through the friction of the welded nylon, thereby preventing screw back-out and detachment.
The eccentric lock washer is a washer that, when used in combination with a hex nut, provides strong resistance to loosening.
Learn More About Eccentric Lock Washers
