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What Should Be Tightened—the Nut or the Bolt Head?

The question is often asked as to whether the nut or the bolt head should be tightened. Although at first blush a seemingly unimportant distinction, the choice you make in tightening the nut or bolt matters and can affect the final preload. In this article, Dr. Bill Eccles explains the parameters which affect preload variation and the importance of providing detailed instructions to the assemblers.

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