What is the significance of torque angle in screw applications?

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Torque angle is crucial in screw applications as it influences the clamping force and ensures proper fastening. The prevailing zone indicates the area where the screw engages with the material, with increased force likely due to self-tapping mechanisms. The angle mentioned refers to the degrees of rotation, which can significantly affect the screw's performance. Understanding these factors is essential for achieving optimal torque and preventing material damage. Proper torque angle application leads to enhanced joint integrity and reliability in various engineering contexts.
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Not a homework question necessarily but I came across a graph in one of my books from school and wanted more information. Looking at the attached picture it looks like the prevailing zone refers to a screw being torqued into a hole, and the red shows the increase in force probably due to being self tapped? Also I'm assuming angle is referring to angle of turn in degrees, meaning roughly 6.9 turns?

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