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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
Nylon self locking nuts must not be used where temp is >121*c (T or F)?
True
26
What self locking nut is used when temp exceeds 121*c?
- metal lock nuts
27
Is an engine nut approved for airframe structure?
- false
28
When is a wing nut used?
- When a part needs to be removed frequently
29
What is a stud?
- 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
Why are Heli-coils used?
- Protect against insertion and removal of bolts and screws
31
What are the 3 basic classifications of screws in aircraft construction?
- machine screws - structural screws - self-tapping screws
32
What are machine screws?
- used in light structural parts (e.g. fearings) - thread runs the full length of the shank
33
What are structural screws?
- made of alloy steel - heat treated and can be used as structural bolts
34
What are self tapping screws used for?
- hold thin sheets of metal, plywood or plastic together - type A has sharp point / type B has blunt point
35
What is a dowel?
- solid cylindrical rod that is used where precision alignment is required - made from wood, metal or plastic
36
What are the 4 types of heads available on self tapping screws?
- Round head - Truss head - counter sunk head - counter sunk oval head
37
What is a lock washer?
- spring action of washer that creates a friction force - only used if the joint is not structurally critical
38
What are the 3 common lock washers?
- spring - tab - shakeproof
39
What are spring washers?
- when tightened, the spring is compressed creating friction which prevents vibration
40
What are tab washers?
- 2 or more tabs - 1 bent over component - 1 bent over flats of nut - not reusable
41
What are shakeproof washers?
- sharp edges prevent unscrewing of nut (internal + external) - they can be reused if teeth are in perfect condition
42
What is lock wire?
- securing components - made of stainless steel - used in critical areas (lot of vibration) - it prevents the bolts from unscrewing
43
What are the 3 common quick release fasteners?
- Dzus - Airloc - Camloc
44
What are the benefits of quick release fasteners?
- easy locking and unlocking - vibration resistant - reusable
45
What are circling?
- used for internal + external locking - used for retaining shafts, seals, bearings etc
46
A rivet must extend beyond the base material at least x1.5D? (T OR F)
True
47
What head is 470?
-universal (dome)
48
What head is 426?
- Countersunk (flat)
49
What alloys are Hi-Lok bolts made out of?
- titanium - stainless steel - steel - aluminium
50
How many turns required for quick release fasteners?
1/4 turn
51
A shakeproof washer has slanting serrations on internal and external circumference? (T OR F)
True
52
Can nylon self locking nuts be used in engines?
Yes according with engine manufacturer
53
Aluminium alloy rivets manufactured from 2117 material are identified by?
- small dimple in the centre of the head

M6 (10 decks)

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