Heavy Hex Sealing Nuts

Heavy Hex Sealing Nuts

Strong, Clean Sealing Power

ZaGO’s heavy hex sealing nuts are designed to withstand extreme pressure, and to form a complete seal along the threading of your bolt. Where liquids, gas, and contamination are present, it is crucial to use ZaGO’s heavy hex sealing nuts rather than ordinary nuts to ensure optimal performance from your equipment. We have bonded a silicone element directly into the heavy hex sealing nut, thus eliminate the need for you to use any messy liquid sealants. The rubber segment, when the nut is torqued, forms an unbeatable seal about the threading of your bolt that remains strong no matter the conditions it is exposed to.

Like all ZaGO products, our heavy hex sealing nut is easy to install and is completely reusable, as we never use any liquid sealants. That means your workers are never breathing in harsh chemical vapors, and it also means that there is no harmful waste for you to deal with. We can fully customize your heavy hex sealing nut so that it is precisely fitted for your application.

Zago’s one piece heavy hex seal nut grants you 360 degrees of sealing power whether its submerged under the ocean, launched into space, used for aviation, used in pneumatic or hydraulic systems, or in virtually any other application. Choose the ideal nuts and bolts for your system, and consult with ZaGO’s expert engineers at your convenience. Please contact us so that we may begin planning with you the right sealing and fastening solutions for all your equipment.

ZaGO sealing products are available in a wide range of screw materials as well as “o” ring material options.

Free Sample Products

Leverage this unique opportunity to experience ZaGO’s products at no cost.

ZaGO E-catalogs

Sealing Screws

Switch Boots

ZaGO News

Subscribe to our email list and stay up-to-date with all our newest products and sealing solutions.

By submitting this form, you are consenting to receive marketing emails from: . You can revoke your consent to receive emails at any time by using the SafeUnsubscribe® link, found at the bottom of every email. Emails are serviced by Constant Contact

Free Sample Products

Leverage this unique opportunity to experience ZaGO’s products at no cost. We’re confident you’ll be highly satisfied since you’ll see the difference our protective products make for your equipment. But the free samples are just a taste; when you order you will have the opportunity to perfectly tailor-fit all your nuts, bolts, switch boots and seals to your unique equipment and application.

ISO 9001 Registered Firm

ISO 9001 RegisteredFirm

Product Brochure

ZaGO Product Brochure View PDF

The ZaGO Advantage


Proudly Manufactured in the U.S.A

ZaGO manufactures its products in its state-of-the-art facility in Newark, New Jersey, using the finest possible materials. Every step of the manufacturing process is conducted by our local team, giving us the advantage in rapid production and coordination. We’re also listed with NJ Biz as one of New Jersey’s top manufacturing employers.


Prompt Delivery Worldwide

Because of our central location, we can make daily, timely deliveries throughout North America, South America, Europe, and Asia. Our ability to quickly create prototypes, implement adjustments, and begin production means that we have exceptionally short lead times.


Compatible with All Environments

Whatever hazards you face, ZaGO has a sealing solution. Torrential rains, oil intrusions, freezing temperatures or sandstorms–you name it. Our durable products were designed to withstand the most rugged environments, meaning that you can use our fasteners, boots, and crystal seals in virtually any kind of application.


Reusable and Convenient

ZaGO’s products are simply easy to use. We took messy solvents and complex installation and maintenance out of the equation. What you’re left with are one-piece, reusable products that are remarkably quick to install.


Customizable Features

You can customize all the essential features of your products here at ZaGO–from the materials to the colors. As a result of our extensive inventory, advanced equipment, and expert technicians, we offer clients custom-tailored products fitted according to their exact specifications.