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An Aerospace Manufacturing Perspective

Introduction to Fastener Technology Part 3. An Aerospace Manufacturing Perspective. Fasteners in Aviation. Permanent Fastening Discussed previously Temporary Fastening Threaded Non-Threaded. Temporary Fastening . Threaded Bolts Studs Screws Non - Threaded. Temporary Fastening.

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An Aerospace Manufacturing Perspective

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  1. Introduction to Fastener Technology Part 3 An Aerospace Manufacturing Perspective

  2. Fasteners in Aviation • Permanent Fastening • Discussed previously • Temporary Fastening • Threaded • Non-Threaded

  3. Temporary Fastening • Threaded • Bolts • Studs • Screws • Non - Threaded

  4. Temporary Fastening • some common aircraft fasteners organized by part number

  5. Threaded Fasteners • Use to hold parts together • Unlike any other fasteners, threaded fasteners are able to move part(s) relative to others

  6. Threaded Fasteners • Bolts connecting two sections of a PW4098 Turbofan engine

  7. Thread Terminology • External (male) thread: Thread cuts outside of the cylindrical body. • Internal (female) thread: Thread cuts inside of the cylindrical body.

  8. Thread Terminology • Crest – Peak edge of thread • Root – Bottom of thread cut into a cylindrical body • Thread angle – Angle between threads faces

  9. Thread Terminology • Major diameter – Largest diameter on an external or internal thread • Minor diameter – Smallest diameter on an external or internal thread

  10. Thread Terminology • Pitch – Distance between crests of threads

  11. Types of Thread Form • Profile shape of the thread

  12. Thread Standard • A metric ISO screw thread is designated by the letter M followed by the value of the nominal diameter D and the pitch P, both expressed in millimeters and separated by the multiplication sign “×”. • Example: M8×1.25

  13. Thread Drawings For simplified representation, use thick and thin continuous lines for representing crests and roots respectively:

  14. Bolt Terminology • Bolt is a threaded cylinder with a head

  15. Bolt Application

  16. Bolt Application - Engine • Engine case bolt and nut on a Lycoming IO-320 engine • Nut is on the left hand side, bolt head is on the right

  17. Screw Terminology • Screw is similar to bolt, but has a longer thread than a bolt • Bolted joint is usually created by turning a nut; screw is installed by turning it.

  18. Screws Application

  19. Screws Application - Fuselage • Countersunk screws are flush with the skin on this Cessna 310R

  20. Screws Application - Engine • Exhaust shroud screws on an IO-320 engine

  21. Stud Terminology

  22. Stud Application

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