Nut and bolt corrosion is a very old problem that has existed since nuts and bolts were first used. In fact, it is so old that people have taken it for granted and do not consider it a problem anymore.

        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).

        The NUT-SEAL protector system is supplied with either a long or short barrel. The long barrel is used in conjunction with tensioning devices. Tensioners require a thread height approximately two times (2X) for twelve (12) exposed threads. The short barrel is used where tensioners are not required and it allows for (6) exposed threads.

1. Clean exposed nut and bolt
2. Position and tighten protector on exposed bolt (use proper size)
3. Fill with grease to maintain positive pressure

        Use greases that are corrosion resistant and specifically formulated to flow and fill in the area between the protector and the fastener. Alternative greases that do not flow well especially at lower temperatures will leave void spaces, thus leaving crucial portions of the fastener unprotected.

        Under Water. The installation steps are the same essentially as above ground with one important variation.

In step two (2), after the protector has been tightened securely, simply back off two turns. Then (step three), inject grease until an excess visibly comes out from the bottom of the nut cover. Then (step four), re-tighten the protector.

Finally (step 5), re-inject additional grease to provide positive pressure.