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UNIT 5 DESIGN OF SCREWS, FASTENERS Design of Screws, …

105 DESIGN of Screws, FASTENERS and Power Screws UNIT 5 DESIGN OF SCREWS, FASTENERS AND POWER SCREWS Structure Introduction Objectives Geometry of Thread Mechanics of screw and Nut Pair Power screw Mechanics Application of Power screw Standard Threads DESIGN of screw and Nut Threaded Fastener Failure of Bolts and Screws Permissible Stresses in Bolts Summary Key Words Answers to SAQs INTRODUCTION Screws are used for power transmission or transmission of force. A screw is a cylinder on whose surface helical projection is created in form of thread. The thread will have specified width and depth, which bear some ratio with the diameter of the cylinder.

lead screws of machine tools. The buttress thread having one side flat and other sloping combines the advantage of square thread and Acme thread. The flat side provides the efficiency of power transmission while the inclined side provides the ease of adjustment. However, these advantages become possible only when the power is transmitted in one

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