Abstract: Round spring wire (20) FIG. (1) formed into concave tri-elliptic wire (22) FIG. (2-A) and processed to include reversing wave crests (24) FIG. (3-A) having not opposed crest contact (28) FIG. (3-B) requires forming into ring or shape and heat treated as completed elastic form of locking ring device. Unique featured locking of joints and locking of standard fasteners is provided by continuous elastic internal beaming in combination with proportional penetration of joint surfaces by a multitude of relatively sharp reversing wave crests, which are always erect. Useful form is readily shaped and size configured in flat plane such as essentially round form of locking ring device (34) FIG. (4). The locking ring device is used for locking joint by curl formed flange (47b) FIG. (5-B), for plural use in locking of joint by single formed rivet (59) FIG. (6-B), for plural locking of joint by single screw thread fastener such as socket cap screw (78a) FIG.