The McCormick 6640855A1 is a genuine Loctite 243 medium-strength, general-purpose threadlocker designed for securing nuts, bolts, and screws. This 50ml bottle prevents loosening from vibration and shock, suitable for a wide range of applications in agricultural and industrial machinery. It works on all metals, including passive substrates such as stainless steel, aluminum, and plated surfaces. The Loctite 243 formulation allows for disassembly with standard hand tools.