Permatex Green Penetrating Threadlocker is OEM specified. A low viscosity anaerobic adhesive that wicks along the threads of preassembled fasteners to secure them in place. Since it is applied after assembly, preventive maintenance procedures are simplified. Ideal for fasteners ranging from #2 to 1/2\" (2.2 to 12mm) in size. Locks and seals while preventing parts from loosening due to vibration. Protects threads from corrosion. Removable with hand tools. Conforms to ASTM D5363 AN0261, Mil-Spec 46163A, Type III, Grade R.