How to make the high-strength self-tapping secure in place

The high-strength self-tapping screw includes a countersunk head, a tapping column and a screw rod. The top of the screw rod is provided with a tapping column, and the top of the tapping column is equipped with a hexagonal head. The hexagonal head is surrounded by a wrench face, and the upper surface of the hexagonal head has a A cross groove and a flat groove, the surface of the lead screw has an external thread and an internal thread, the thread on the external surface is provided with barbs, the bottom of the lead screw is fixedly connected with the countersunk head, the surface of the countersunk head is provided with concave and convex surfaces, and the concave surface is provided with There are barbs, the top of the countersunk head is equipped with a positioning piece, and the two are fixedly connected.