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Note for Fundamental of Machine Design - FMD By Ruby Mishra

  • Fundamental of Machine Design - FMD
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Threaded Joints/ Screwed Joints By Dr Ruby Mishra SME, KIIT Deemed to be University

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• A thread is formed by cutting a continuous helical groove on a cylindrical surface. • A threaded joint mainly composed of two elements ,a bolt and nut. The screwed joints are widely used where the machine parts are to be readily connected or disconnected without damage to the machine or the fastening.

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Advantages and disadvantages Adv. 1. Screwed joints are highly reliable in operation. 2. Screwed joints are convenient to assemble and disassemble. 3. Screwed joints are relatively cheap to produce due to standardization and highly efficient manufacturing processes. Disadv. 1. Stress concentration in the threaded portions which are the weak points under variable load condition.

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Important parts of screw thread

Lecture Notes