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Fastners - nuts bolts rivets studs
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Fastners - nuts bolts rivets studs

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  • 1. General Engineering PRACTICAL 4: STUDY OF FASTENERS INTRODUCTION: Threaded fasteners are hardware components with external or internal threads. A screw, a nut and a bolt are common threaded fasteners which joins a number of components together. Screw is externally threaded – assembled into a blind threaded hole. Bolt is also externally threaded – inserted through holes in the parts and “screwed” into a nut on the opposite side. Nut is internally threaded – threads of a nut match those on bolts of the same diameter, pitch, and thread form The same fastener could be a bolt or a screw, depending on if a nut is used. Studs are threaded at both ends. Washers – used with threaded fasteners to ensure tightness. Common types – (a) plain (flat) washer; (b) spring washers, to dampen vibration or compensate for wear; and (c) lock washer, to resist loosening. Department of Mechanical Engineering, Cwit, Pune. Page 1
  • 2. General Engineering Washers serve various functions: ✔ Distribute stresses at the bolt or screw head and nut ✔ Provide clearance for large holes ✔ Protect part surface ✔ Seal the joint ✔ Resist inadvertent unfastening The screw - a generic name applied to a setscrew, lead screw, bolt, stud or other component equipped with an external thread, the nut - refers to any component whose internal thread engages the screw, such as the nut of a nut & bolt or a large stationary casting with a tapped hole into which a stud is screwed. Rivets – unthreaded, headed pin – used for achieving a permanent mechanically fastened joint. TYPES OF SCREW BOLTS Department of Mechanical Engineering, Cwit, Pune. Page 2
  • 3. General Engineering TYPES OF NUTS Department of Mechanical Engineering, Cwit, Pune. Page 3
  • 4. General Engineering Wing nut Department of Mechanical Engineering, Cwit, Pune. Page 4
  • 5. General Engineering SCREWS Figure below shows alternative head styles available screws. Department of Mechanical Engineering, Cwit, Pune. Page 5
  • 6. General Engineering Department of Mechanical Engineering, Cwit, Pune. Page 6

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