The split pin is similar to an enlarged pin,

The split pin is similar to an enlarged pin, and the bolt is machined with a radial through hole in the thread near the end of the thread, and the nut is slotted. After installation, the split pin is inserted through the hole in the bolt, and is caught in the groove of the nut, and then the tail of the split pin is deformed. There is also a kind of anti-loose with a fuse. When multiple bolts/nuts are installed in a close position, the holes are machined on the bolts or nuts. After the bolts or nuts are installed, the thin wires are inserted and several are installed together. The bolts/nuts are joined together and the wire is tightened. 6. Wedge thread anti-loose, this is a foreign patent, the principle is to machine the nut thread into a special shape, after the installation, the pre-tightening force on the threaded contact surface mechanical decomposition to provide anti-loose force.