Profile: Heico Fasteners UK Ltd. specializes in offering industrial & upholstery products, locking washers, industrial tools, and fitting packs & kitting. Industrial products include rivets, semi-tubular rivets, shoulder rivets, ball studs & pins, threaded parts, and components with plastics. Wedge lock washers (also known as self locking washers, anti-vibration washers or vibration proof washers) positively lock fasteners using tension instead of friction. Working together, the pre-assembled pair of locking washers combine to create a fastening system that prevents loosening of bolted joints by shock and vibration.