Tag Archives: Bolts

Over-sizing nuts to compensate for coated bolts

Posted on January 8, 2018 by dean

Q:  We have a corrosive application and we are debating on using coated carbon steel bolts and nuts or a solid corrosion resistant alloy. Obviously the coatings cost a lot less but we are unsure about how the coatings affect mechanical strength. A:  Coated bolts and nuts are typically undersized … Continue reading →

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Bolts for municipal waste incinerator: Hastelloy protects from HCl corrosion

Posted on December 12, 2017 by dean

Q:  I’m running a municipal solid waste incinerator and am having trouble with corrosion from a combination of hydrochloric acid and sulfuric acid that is derived from chloride and sulfur containing compounds in the waste fuel stream. I was using Duplex steel bolts for the chloride corrosion but they aren’t holding … Continue reading →

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Difference between Monel 400 and Monel K500 bolts

Posted on April 10, 2017 by dean

Q: I’m currently using Monel 400 hex head bolts in salt water. Should I be using K500? What’s the difference? A: Basically, Monel K500 is a precipitation hardened version of Monel 400. This means the material goes through a heat treating process that changes the alloy’s structural matrix to increase its tensile and … Continue reading →

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Fastener Thread Galling: What Is It & How to Prevent It?

Posted on March 28, 2017 by dean

Thread galling is a common yet a seldom understood fastener problem seen by engineers and fabricators. It occurs when pressure and friction cause bolt threads to seize to the threads of a nut or tapped hole. The fasteners are not just overly tight but “cold/contact” welded together.

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