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

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Presentation transcript:

An Aerospace Manufacturing Perspective Introduction to Fastener Technology Part 3 1

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

Temporary Fastening Threaded – Bolts – Studs – Screws Non - Threaded 3

Temporary Fastening 4 some common aircraft fasteners organized by part number

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

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

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

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

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

Thread Terminology Pitch – Distance between crests of threads 10

Types of Thread Form Profile shape of the thread 11

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×

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

Bolt Terminology Bolt is a threaded cylinder with a head 14

Bolt Application 15

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

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. 17

Screws Application 18

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

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

Stud Terminology 21

Stud Application 22

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