Design of self-tightening fasteners
All the advantages of self-tightening fasteners stem from their design, which includes an annular groove (used to permanently lock the fastener in place on the ductile thin metal plate) and an The rotating element.
This is the installation of a "blind" threaded insert, which is designed to be used where only one side of the workpiece can be contacted for fastener installation.
Regardless of the type, self-tightening fasteners are permanently installed on a malleable metal plate with a thickness of only .012 inches/0.3 mm for the uniquely designed micro crimp version developed for handheld consumer electronic devices. Press the fastener into a hole of an appropriate size, and after applying sufficient squeezing force, press the zigzag compression ring, knurling, rib or hexagon head of the fastener into the panel surface to move the sheet The shank or guide piece of the fastener located in the specially designed annular groove in the panel is called undercut. The metal pressed into the undercut prevents the fastener from moving axially, while the non-circular shifter prevents the fastener from rotating. No need for secondary operations.
Over the years, dozens of types and thousands of self-tightening fasteners (steel, stainless steel or aluminum) have been designed, and more and more fasteners are about to appear.