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Problems related to improper manufacturing, selection and installation are just as likely to cause fastener failure as hydrogen embrittlement and loosening
There are many ways to perform destructive testing. The most helpful, and preferred by manufacturers, is to intentionally destroy an assembly in a controlled environment to determine the performance capability of one or more of its components. Another way, done unintentionally and all too often by consumers, is to simply misuse a product.
Washers help threaded fasteners in many ways, most notably by effectively distributing and maintaining clamp load, and preventing fastener movement or corrosion.
To the general public, a washer is just a cheap metal disc that keeps screws, bolts, and nuts tight. But to manufacturers, a washer is a vital fastening component, specially designed to perform unique functions and ensure a reliable bolted joint.
After writing this column for six years, I understand the need for brevity. With that in mind, I thought it would be useful to summarize some of the key points that I’ve raised in the past.
I have included the issue in which each column appeared so you can delve into the topic in more detail if desired. As always, please feel free to contact me with your questions, comments or observations.
There's a common misconception about the relationship between torque, tension and friction when a threaded fastener is tightened. This article presents a new way of thinking about the relationship between these variables.