Self-locking fastener

DN Staff

April 22, 2002

1 Min Read
Self-locking fastener

A-Lock uses the shallow angle of two inclines for locking and requires no tools or extra parts.

Unlike other fasteners that require lock washers and nylon patches, a new patented vibration-resistant fastener uses isometric threads rather than the symmetric threads more typical of common nuts and bolts. Called A-Lock, the patented fastener self-locks when the nut encounters resistance.

This two-piece unit uses the wedging action of the thread's shallow inclines for self-locking. The nut turns freely until it contacts the clamping parts. Then additional turns engage the nut's shallow flanks with those on the bolt, wedging them into a locked position. Radial force acting on the inclines is greater than axial force, which achieves the clamping action.

Tad Stanizewski, Shap Inc., 32 Canterbury Lane, Hackettstown, NJ 07840; Tel: (908) 684-4025; Fax: (908) 684-4027.

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