Permatex Medium Strength Threadlocker Blue. OEM specified. All-purpose, medium strength threadlocker. Ideal for all nut and bolt applications 6 mm to 20 mm (1/4″ to 3/4″). Eliminates need for stocking expensive lock nuts and lock washers. Locks and seals while preventing parts loosening due to vibration. Protects threads from corrosion. Removable with hand tools for easy disassembly. Conforms to ASTM D 5363 AN0321 (Mil-S-46163A, Type II, Grade N).