Vibration-resistant nuts

  • 03-May-2010 02:30 EDT
Hardlock_nut.jpg

Hard Lock Nuts from Hard Lock Industries are designed to withstand loosening from vibration, thus ensuring a secure connection for enhanced safety and reduced maintenance and inspection costs. A wedge principle creates a strong self-locking force; a small curve in the sliding part of the convex top of the lower nut acts as the wedge. When the concave upper nut is tightened, the effect is similar to that of a hammer driving in a wedge. The nuts have passed the American Vibration and Impact Test NAS 3350/NAS 3354 and retained their grip longer than competitive versions in Junker Horizontal Screw Looseness Tests. Even when loosened by 45º, more than half of the tightening torque remained. Vibration tests performed in this condition revealed no loosening, indicating that a self-locking effect is present even if the nut is not fully tightened. The two-piece nut is installed with a wrench and is reusable since there is no abrasion between the concave and convex.

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