A self locking fastener is disclosed herein which is self-contained and resists loosening even when used in applications and environments where the fastener is exposed to vibration. In one form the present invention provides a self locking screw-type fastener, methods of manufacturing and/or assembling such fasteners, and methods of fastening using such fasteners. In another form, the invention provides a self locking nut-type fastener, methods of manufacturing and/or assembling such fasteners, and methods of fastening using such fasteners. In still other forms, the invention provides components for creating self locking fasteners using at least in part conventional materials and/or fasteners, methods of manufacturing and/or assembling such fasteners, and methods of fastening using such fasteners. In another form, the invention provides prepackaged kits for customizable fasteners that purchasers can buy and use to assemble customized fasteners in accordance with the invention.