The 8703 Threadlocker, High Strength, Permanent has an anaerobic formulation designed to secure and seal fasteners permanently. It prevents loosening caused by vibrations, shock, expansion and contraction. The threadlocker is resistant to heat, corrosion, water, gases, oils, hydrocarbons, and many chemicals. The 8703 is used to secure and seal hydraulic line fittings, housing screws, machinery keys, and many types of nuts and bolts.