Permatex permanent strength threadlocker red is a permanent high 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 3/8 to 1 in Dia nut and bolt assemblies where future disassembly is improbable. Excellent chemical resistance and temperature range of -54 to 149 deg C (-65 to 300 deg F). Meets or exceeds the requirements of military specification Mil-S-46163A type II, grade O. NSF white book registered.