Corrosion happens when oxygen and moisture mix, creating what we usually think of as rust. When you seal out the moisture and oxygen, you protect the object from corrosion. It can't oxidize and thus it's life is extended. These NUT-SEAL protector systems are designed and manufactured to prevent corrosion of nuts and bolts.

        Corrosion of fasteners (nuts and bolts) is a very old problem, and has existed since nuts and bolts were first used. A threaded fastener is often the "weak link" in the joint from a corrosion standpoint. However, corrosion of fasteners is often taken for granted and not fully considered in the standard corrosion protection specification for a facility. Much more attention is given to the structure, vessel or piping materials, than to what is holding the facility together. The fact is that corroded fasteners can severely compromise the integrity of a facility.

        Corrosion of the threads results in a significantly roughened surface. The corrosion product formed takes up more volume than the metal it replaced, which fills the thread area between the bolt and nut. The result is both a weakened joint from loss of metal, and the inability to remove the nut from the bolt. The former compromises the integrity of the joint, while the latter makes removal and replacement extremely difficult.

        The protector is made of polyethylene material that fits over the nut and exposed threads after the fastener is properly installed. A protective grease is inserted through a standard grease fitting on the top of the protector, filling the space between the installed nut and bolt and the protector with grease. A positive pressure (higher pressure inside the protector than outside) is maintained by an elastic membrane. This prevents penetration of the outside atmosphere to the nut and bolt (fastener), thus preventing the conditions required for the development of corrosion. The elastic membrane allows for temperature variations, specifically expansion and contraction of the NUT-SEAL protector system while maintaining the required positive pressure internally. This prevents penetration of moisture and contaminates under field conditions while keeping the threads bathed in protective grease at all times. As a result, it becomes an effective corrosion barrier in atmospheric conditions up to 250°F (125°C).