Permatex surface insensitive threadlocker blue is a medium strength anaerobic threadlocking material, which cures between engaged threads to form a unitized assembly that helps resist leakage, shock and vibration. The product is a single component, anaerobic liquid that cures when confined in the absence of air between close fitting metal surfaces. Ideal for all 1/4 to 3/4 in Dia nut and bolt assemblies, achieving significant strength even in the presence of light oils. Excellent chemical resistance and a temperature resistance range of -54 to 149 deg C (-65 to 300 deg F). Easily removable with hand tools for servicing requirements.