Fasteners & fastening

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Fasteners & fastening

  1. 1. 2-1 2-2 2-3 2-4 2-5 2-6 2-7 2-8 2-9 2-10 2-11 2-12 nuts 2-13 2-14 2-15 Fasteners and Fastening Threaded Fasteners Screw and Screw Thread Screw Thread Terminology Basic Profiles of Screw Threads Types of V-threads Profile of Square Thread and its modifications Right-Hand and Left-Hand Threads Single-start and Multi-start Threads Bolts and Nuts Chamfering of Bolts and Nuts Washer facing of the hexagonal bolts and Counter-sinking of the nut Method of drawing hexagonal head bolt and nut Method of drawing a square head bolt and nut
  2. 2. A mechanical element which holds two or more parts of a machine or a structure is known as fastener. The process is called fastening. Permanent fastening: it involves destruction during separation  press fits  shrink fits  rivets  welding, brazing, and soldering  adhesives CH -8 LE C 33 Sli de 3
  3. 3. Temporary fastening: it doesn’t involve destruction during separation  Bolts and nuts  studs and nuts  screws  keys  pins, etc…
  4. 4.  Externally threaded fasteners  Internally threaded fasteners
  5. 5. Use:  to fasten parts together  for the relative adjustment of the adjacent parts CH -8 LE C 33 Sli de 6
  6. 6.  To transmit motion and power CH -8 LE C 33 Sli de 7
  7. 7. Lead=L=n p n = number of start Figure 2-1 Terminology of screw threads. Sharp Vee Threads shown for clarity; the crests and roots are actually flattened or rounded during the forming operation
  8. 8.  V-thread  Square thread
  9. 9. CH -8 LE C 33 Sli de 10
  10. 10. CH -8 LE C 33 Sli de 11
  11. 11.  Right-hand thread – A screw thread that is screwed in by rotating CW .  Left-hand thread – A screw thread that is screwed in by rotating CCW.
  12. 12. (a) Single (STANDARD) (b) double (c) triple threaded
  13. 13. 2-10 Bolts and Nuts Bolt . Threaded fastener designed to pass through holes in mating members and to be secured by tightening a nut from the end opposite the head of the bolt.
  14. 14. 2-11 Chamfering of Bolts and Nuts
  15. 15. 2-11 Chamfering of Bolts and Nuts
  16. 16. 2-12 Washer facing of the hexagonal bolts and nuts Finished vs. Unfinished Bolts: The difference between a finished and Unfinished hex head bolt is a washer Under the head of the finished bolt.
  17. 17. 2-13 Counter-sinking of the nut Countersinking of nut facilitates the gripping of the bolt end when the nut first enters while it is threaded on
  18. 18. 2-14 Method of drawing hexagonal head bolt and nut
  19. 19. 2-14 Method of drawing hexagonal head bolt and nut CH-8 LEC 33 Slide 20
  20. 20. 2-14 Method of drawing hexagonal head bolt and nut
  21. 21. 2-14 Method of drawing hexagonal head bolt and nut
  22. 22. 2-15 Method of drawing a square head bolt and nut
  23. 23. 2-15 Method of drawing a square head bolt and nut
  24. 24. 2-15 Method of drawing a square head bolt and nut
  25. 25. Conventional representation s of threads
  26. 26. 2.17.Locking of nuts
  27. 27. 2.21 Foundation bolts

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