Permatex® medium strength threadlocker blue is a medium strength anaerobic threadlocking material, which cures between engaged threads to form a unitized assembly that resists virtually all 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. Excellent chemical resistance with a temperature resistance range of -65 to 300 deg F. Easily removable with hand tools for servicing requirements.