The rotation of a bolt (torque) at some point causes it to stretch (tension). The widely recognized engineering formula, T= K x D x P (to be explained later in this article), was used to provide the chart's values, but it must be understood that every bolted joint is unique and the optimum tightening torque should be determined for each application by careful experimentation. A properly tightened bolt is one that is stretched such that it acts like a very ridged spring pulling mating surfaces together. The formula for generating these values is explained below. This article provides such a chart for "Initial Target Tightening Torque. Many times I have been asked if a chart is published on the recommended tightening torque for various bolt grades and sizes. "What torque should I use to tighten my bolts?" is a question suppliers of bolts are frequently asked by end user customers. What is the Proper Torque to Use on a Given Bolt
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