Quality & Safety

Engineered for the Toughest Jobs.

quote“Hot bolting terrifies me because it means someone’s life is on the line. It reminds me of an explosion that happened at our company that killed several people and burned others. Those are my people out there, and when you have hydrocarbons running through a line it’s scary.”

-A Turnaround Manager, on hot bolting

In the past, hot bolting has been seen as a necessary evil. Every second of downtime is a loss of revenue for the company. Enough downtime threatens the company’s long term bottom line and economic health.

Hot bolting has long been seen as the solution to downtime. In spite of the dangers of hot bolting, it has been viewed and used as a fast way to get facilities up and running again. The only way to effectively save money, it has seemed, is to put people in danger.

Until now. Whereas in the past, most companies have had to buy bolts, install them, and accept that one day they would seize and require hot bolting to remove them, our team has found a way to make it possible for fasteners to last much longer and to know when they will seize so you can schedule maintenance with certainty. Our fasteners are expected to last 21 years in even the most corrosive environments, and are backed by a five-year no-seize warranty.

Doxsteel Fasteners make hot bolting history.

Specifications and Compliance

Doxsteel Fasteners comply with ASTM and API 20E specifications, including:


quote“Imagine: you send an ROV down to the bottom of the ocean floor off the coast of Brazil to do a maintenance check on subsea equipment. And it’s clear, beautiful. There’s fish swimming around and plant life everywhere. And there in the sand is a nut and a bolt. And you ask yourself, ‘Where in the heck did that come from?’ And the ROV goes back down a week later and there are three more lying in the sand. Now you have to pull the wellhead off the ocean floor, shut down operations, just to discover you’ve got bad bolts. Now you’ve gotta pull up every wellhead, and this is a million dollar deal.

You might think that comes back to the fastener company, but it doesn’t. It winds up on the backs of the turnaround team. We’re here to change that.”

Doxsteel Vice President and Fastener Expert Steve Cabral

Every Fastener Has an Origin.

The Rise of API 20E

Going the extra mile to create a more traceable bolt.We comply with ASTM specifications so we know we have designed a quality bolt; we comply with API 20E specifications so we know our bolts are traceable. API 20E requires that fastener companies who want to present API compliance as a credential contractually commit to API licensing by agreeing to hold and produce documentation showing the date of fabrication, what standard was utilized in the the production of the bolt, and that the bolt meets the specifications required by the license.

?Learn more about Doxsteel Fasteners’ traceability.

The FELT Test

A new spin on an old idea.

Standard salt fog tests on high performance fasteners are only designed to determine the level of red rust that accumulates on the bolt. Through the years since its invention it has been able to provide companies with vital information to expand their knowledge of bolt corrosion and failure. However, it is a test with many flaws. Its measurement of red rust is largely subjective and does not produce concrete numbers. Testing is performed on a company’s best-produced fasteners and don’t account for inconsistency and compromising shipping conditions. The tests are also never performed when the bolt is in tension, so it does not accurately reflect the real world conditions of the fastener. In short, it does not tell us the one thing we need to know: will the fastener seize?

We knew we had to update the salt fog test for use in today’s environment, so we immediately got to work designing a new way to test our bolts. We call it the Fastener End of Life Test (FELT).

When we produce a set of fasteners, we keep samples of each production batch for testing. We place them under tension and put them in a salt fog environment to simulate their real world applications. Every 120 days, we open a sample to check its condition. If the fasteners still turn, we know that the bolts in the field are still performing and provide our customers with a progress report. We keep enough samples from each batch to continue the test for eight years, and as an old batch is opened a new batch is closed. If at any time a sample should fail to turn, we recommend our customers schedule a turnaround before the fasteners seize in the field. Our customers can use this information avoid the costs that come from lengthy shutdowns as well as avoid the necessity of a hot bolting scenario. With every part specifically numbered and traceable to the heat load and batch, our customers can target the bolts that are failing and won’t have to shut down the entire facility or pull up wellheads from the bottom of the ocean.

The FELT test also helps us build a better fastener. Keeping our products in constant evaluation tells us more and more about what they can do and helps identify any potential weakness in our process. When it comes to designing the best fastener we can, we are always looking to improve our methods.

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quote“In the ASTM G31 Acid Immersion Test, the Doxsteel coated nut shows the least average weight loss during the test period, with 75% less weight loss than the Hastelloy C276 material, which is known for its corrosion resistance.”


— Fracture Mechanics Manager Carl Ziegler, Element Materials Technology (formerly Stork)