IronClad Bolt Caps

IronClad™ Foundation Anchor Bolt Caps

NTC Wind Energy's patented HDPE Ironclad™ bolt caps were developed to protect wind turbine foundation anchor bolts and they remain the only effective cap available. NTC Wind Energy's Ironclad™ Bolt Caps are specifically designed to seal around the rod, nut and washer and against the tower flange to create a virtually air and water tight environment around each bolt. This prevents the dissipation or breakdown of the grease applied to the metal and prevents water from traveling down the threads and into the bolt sleeve. It is important to note that the caps do not and must not make contact with the threads on the rod, as this would cause transpired moisture from the bolt sleeve to wick up and stay on the threads that we intend to protect. Our bolt caps are also UV resistant to assure the long-term protection of your investment. We are so confident in our caps that we guarantee them for five years with our installation service (excluding damage caused by external factors such as fire, sheet ice, animals or humans).

IronClad Extreme Duty Bolt Cap

This patent pending bolt cap was designed and built to address the need for a heavier-duty cap, providing even more protection against moisture intrusion and more resistance against damage due to the elements.

The Extreme Duty Bolt Cap incorporates four sealing surfaces, including an o-ring, two retaining rings which bottom out on the tower flange under compression, and a flexible skirt on the outside of the cap which also compresses against the tower flange. These four redundant seals provide maximum protection against the intrusion of moisture. This is especially important for coastal installations, where corrosive salt water is present.

At the top of the cap, we have incorporated a grease injection port for even more protection. Warmed wax-based grease can be injected or poured thru the port. The liquid grease congeals around the bottom seal as it cools, providing an extra measure of protection against corrosion of the washer and the base of the nut. The injection port is protected by a hexagon-shaped top cap, which also facilitates installation and removal with a socket wrench or impact wrench.

There are eight heavy gripping fins inside the cap, which provide a very tight and secure installation, while also providing for fast removal for retensioning.

The Extreme Duty Bolt Cap was built to resist impact damage from sheet ice. We’ve added extra material to the top of the cap and brought the interior fins all the way to the top, adding additional structural strength to the cap. This cap weighs a full 13 ounces and made of thick polypropylene with the maximum amount of added UV stabilizer, making it by far the toughest and longest lasting cap in the industry.

For serious protection against corrosion of your foundation anchor bolts in harsh environmental conditions, nothing beats the IronClad Extreme Duty Bolt Cap. We welcome your inquiry for pricing and availability.

NTC Wind Energy

PO Box 2280,

Boerne, TX 78006

Phone. 800-359-0372