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Bolts are placed around the pressure vessel's perimeter in a circle with a diameter of Dcircle = 800 mm. The bolts can withstand 245 MPa of tension stress.
It is difficult to distinguish between a bolt and a screw. According to Machinery's Handbook, the academic distinction lies in their intended design: bolts are made to fit through an unthreaded hole in a component and secure it with the help of a nut, though they can also be used to tighten into threaded components like screw or tapped housings without a nut.
In contrast, screws are used in components that already have an internal thread or to create an internal thread within them. The terms screw and bolt are frequently used by different people, so this definition permits ambiguity in the description of a fastener depending on the application it is actually used for.
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