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M6 > M6.5 > Flashcards

M6.5 Flashcards

1
Q

How are screw threads measured?

A
  • measured with a screw thread pitch gauge
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2
Q

What are the classes of fit?

A

Class 1 > loose fit
Class 2 > free fit
Class 3 > medium fit
Class 4 > close fit
Class 5 > tight fit

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3
Q

Generally aircraft screws are manufactured with what class thread fit?

A
  • class 2
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4
Q

Generally aircraft bolts are manufactured with what thread class fit?

A
  • Class 3
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5
Q

When cut in clockwise direction, the thread is said to be?

A
  • right hand
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6
Q

When cut in anti-clockwise, the thread is said to be?

A
  • left hand
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7
Q

What thread should be used for fasteners where locking power is required?

A
  • single lead thread
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8
Q

What are the common thread standards?

A
  • British standard thread forms
  • American national thread forms
  • unified thread forms
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9
Q

What are the 4 British standard thread forms?

A
  • British standard whitworth
  • British standard fine
  • British standard pipe
  • British association
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10
Q

What are the 2 American national thread forms?

A
  • ANC (American national coarse)
  • ANF (American national coarse fine)
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11
Q

What is the angle for American national thread forms?

A
  • 60*
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12
Q

BSW vs BA angle difference ?

A

BSW - 55*
BA - 47.5*

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13
Q

Does a fine pitch screw have stronger grip than a coarser screw

A

True

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14
Q

Fine thread = more threads
Coarse thread = less threads
True or False?

A

True

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15
Q

What is a bolt designed for?

A
  • to hold 2 or more items together
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16
Q

Bolts that are typically used on aircraft structures are what shape?

A
  • Hex heads (range of sizes)
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17
Q

What does AN stand for in terms of bolts?

A
  • army/navy
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18
Q

Aircraft bolts are available in which material?

A
  • cadmium-plated nickel steel
  • corrosion resistant steel
  • 2024 aluminium alloy
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19
Q

Unless specified, a bolt is made of?

A
  • cadmium plated nickel steel (corrosion resistant bolt)
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20
Q

Clevis bolts are applied when what load is applied?

A
  • Shear
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21
Q

When are eye bolts used?

A
  • when external tensions are to be applied
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22
Q

What are internal wrenching bolts made out of? Also what loads is it designed for?

A
  • high strength steel bolts
  • designed for high tensile strengths
23
Q

What are the 2 basic types of nuts?

A
  • self locking
  • non-self locking
24
Q

What are self locking nuts?

A
  • contain a locking device in the design to prevent it from becoming loose
25
Q

Nylon self locking nuts must not be used where temp is >121*c (T or F)?

A

True

26
Q

What self locking nut is used when temp exceeds 121*c?

A
  • metal lock nuts
27
Q

Is an engine nut approved for airframe structure?

A
  • false
28
Q

When is a wing nut used?

A
  • When a part needs to be removed frequently
29
Q

What is a stud?

A
  • shaft that is threaded at both ends
  • where joints have to be broken frequently
  • used to replace bolts and screws to prevent damage to tapped holes
30
Q

Why are Heli-coils used?

A
  • Protect against insertion and removal of bolts and screws
31
Q

What are the 3 basic classifications of screws in aircraft construction?

A
  • machine screws
  • structural screws
  • self-tapping screws
32
Q

What are machine screws?

A
  • used in light structural parts (e.g. fearings)
  • thread runs the full length of the shank
33
Q

What are structural screws?

A
  • made of alloy steel
  • heat treated and can be used as structural bolts
34
Q

What are self tapping screws used for?

A
  • hold thin sheets of metal, plywood or plastic together
  • type A has sharp point / type B has blunt point
35
Q

What is a dowel?

A
  • solid cylindrical rod that is used where precision alignment is required
  • made from wood, metal or plastic
36
Q

What are the 4 types of heads available on self tapping screws?

A
  • Round head
  • Truss head
  • counter sunk head
  • counter sunk oval head
37
Q

What is a lock washer?

A
  • spring action of washer that creates a friction force
  • only used if the joint is not structurally critical
38
Q

What are the 3 common lock washers?

A
  • spring
  • tab
  • shakeproof
39
Q

What are spring washers?

A
  • when tightened, the spring is compressed creating friction which prevents vibration
40
Q

What are tab washers?

A
  • 2 or more tabs
  • 1 bent over component
  • 1 bent over flats of nut
  • not reusable
41
Q

What are shakeproof washers?

A
  • sharp edges prevent unscrewing of nut (internal + external)
  • they can be reused if teeth are in perfect condition
42
Q

What is lock wire?

A
  • securing components
  • made of stainless steel
  • used in critical areas (lot of vibration)
  • it prevents the bolts from unscrewing
43
Q

What are the 3 common quick release fasteners?

A
  • Dzus
  • Airloc
  • Camloc
44
Q

What are the benefits of quick release fasteners?

A
  • easy locking and unlocking
  • vibration resistant
  • reusable
45
Q

What are circling?

A
  • used for internal + external locking
  • used for retaining shafts, seals, bearings etc
46
Q

A rivet must extend beyond the base material at least x1.5D? (T OR F)

A

True

47
Q

What head is 470?

A

-universal (dome)

48
Q

What head is 426?

A
  • Countersunk (flat)
49
Q

What alloys are Hi-Lok bolts made out of?

A
  • titanium
  • stainless steel
  • steel
  • aluminium
50
Q

How many turns required for quick release fasteners?

A

1/4 turn

51
Q

A shakeproof washer has slanting serrations on internal and external circumference? (T OR F)

A

True

52
Q

Can nylon self locking nuts be used in engines?

A

Yes according with engine manufacturer

53
Q

Aluminium alloy rivets manufactured from 2117 material are identified by?

A
  • small dimple in the centre of the head

M6 (10 decks)

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