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CAT B- Mod 6 Materials and Hardware > 6.5 Fasteners > Flashcards

6.5 Fasteners Flashcards

1
Q

How can the thread pitch be determined?

A

With a screw thread pitch gauge

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2
Q

What does the class of fit indicate?

A

The tolerance of the thread

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3
Q

What are the classes of fit grades?

A

Class 1 loose fit through to Class 5 tight fit

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4
Q

What is a class 2 fit?

A

Free fit

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5
Q

What fit are aircraft bolts manufactured too?

A

Class 3- Medium fit

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6
Q

What fit are aircraft screws?

A

Class 2

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7
Q

What is a thread formed on a cylinder called?

A

Straight or parallel

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8
Q

What is form?

A

The shape of one complete contour

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9
Q

What is the crest?

A

The prominent point of the thread

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10
Q

What is the root?

A

The bottom point of the thread.

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11
Q

What is the flank?

A

The slope between the crest and root.

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12
Q

What is the thread angle?

A

The angle between two flanks.

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13
Q

What is the major diameter?

A

Diameter of the crest

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14
Q

What is the depth?

A

The radial distance between root and crest.

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15
Q

What is the pitch?

A

Distance between peaks

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16
Q

What is the lead?

A

The amount of travel on the thread for one complete turn.

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17
Q

What is run out?

A

Where the minor diameter merges with the plain shank

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18
Q

What is the helix angle?

A

Angle of the axis.

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19
Q

Where should single lead threads be used?

A

When locking power is requireed.

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20
Q

On a single lead thread are the pitch and lead the same?

A

Yes

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21
Q

What are the three most common threads?

A

British standard
American National
Unified

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22
Q

What are the four british standard threads?

A

Whitworth
Fine
Pipe
British Association

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23
Q

What is british standard whitworth?

A

Standard coarse thread for general purpose

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24
Q

What angle is british whitworth?

A

55 degrees

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25
Q

What is BSP?

A

Adaptation of whitworth used for pipe couplings.

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26
Q

What is BA used for?

A

Fine pitch used for sizes below 6.35mm.

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27
Q

How are BA sizes expressed?

A

0-10, larger the number the smaller the thread.

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28
Q

What thread angle is BA?

A

47.5 degrees

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29
Q

What are the two types of american national thread?

A

Fine and coarse

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30
Q

What is the thread angle of ANC and ANF?

A

60 degrees

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31
Q

What are the three types of unified thread?

A

Coarse
Fine
Extra fine

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32
Q

What thread profiles are primarily transmission threads?

A

Square
Butress
Acme

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33
Q

What increments is the diameter of a bolt given in?

A

1/16

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34
Q

What increments is the length of a bolt given in?

A

1/8

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35
Q

What is the grip length?

A

The part of the bolt that has no thread

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36
Q

What designation does a corrosion resistant bolt have?

A

C

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37
Q

What designation does an aluminium bolt have?

A

DD

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38
Q

How is it designated if a bolt is drilled or not for a cotter pin?

A

The letter A

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39
Q

How is it designated if a bolt is drilled or not for locking wire?

A

H

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40
Q

Where are clevis bolts used?

A

Where a shear load is applied.

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41
Q

Where are eye bolts used?

A

Attachment of turnbuckles or external tension loads.

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42
Q

What are AN73 to AN81 bolts?

A

Hex-headed nickel-steel bolts for the engine.

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43
Q

What is an internal wrenching bolt?

A

It has a hex machined into the head so an allen key can be used.

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44
Q

Who developed precision airframe bolts?

A

NAS

45
Q

What are all aircraft bolts measured by except AN bolts?

A

Their grip length

46
Q

What are the two basic types of nut?

A

Self locking and non self locking

47
Q

If more than three threads protrude from a locking nut then what must be done?

A

A washer under the head

48
Q

What is the max temp for nyloc nuts?

A

121 degrees c

49
Q

As plain nut have no locking ability what is used to lock them?

A

Spring washerq

50
Q

What is the purpose of a wing nut?

A

To allow the nut to be removed frequently without the use of tools

51
Q

What are tinnerman nuts used for?

A

Light aircraft to mount instruments

52
Q

How do you know the correct orientation of a stud?

A

One end has shorter thread, it is coarser, so when a nut is undone at the other end the coarse thread won’t be loosened.

53
Q

What types of stud are there?

A

Standard
Waisted
Stepped
Shouldered

54
Q

What are the three methods of stud installation?

A

Stud box
Stud insertion tool
Lock nuts

55
Q

What can heli coils prevent?

A

Damage to the threaded hole from consistent insertion and removal

56
Q

What are the two types of heli coil insert?

A

Standard type which has a free running insert
Screw lock type

57
Q

What helps heli coils from not being misaligned?

A

They are self adjusting

58
Q

What load carrying does a heli coil have?

A

across the entire

59
Q

What are the three classifications of screw?

A

Machine screws
Structural Screws
Self tapping screws

60
Q

What are machine screws used for?

A

Fairings, inspection plates, clamps and other light plates

61
Q

On a structural screw what are the shank tolerances similar too?

A

AN hex-head bolts

62
Q

What heads are structural screws available with?

A

Fillister
Flat
Washer heads

63
Q

What four heads are available for self-tapping screws?

A

Round
Truss
Counter sunk
Counter sunk oval

64
Q

Where are dowels used?

A

For precision alignment and correct orientation of two mating surfaces

65
Q

What types of dowels are used on aircraft?

A

Smooth solid
Hollow
Threaded
Split hollow

66
Q

What are some of the methods of locking?

A

Safety wire
Split pins
Lock washers
Circlips
Quick release fasteners
Keys

67
Q

How do lock washers work?

A

The spring action of the washer creates a strong friction force.

68
Q

What three types of lock washer are used?

A

Spring
Tab
Shakeproof

69
Q

How many twists per inch minimum?

A

6-8

70
Q

What are pal nuts?

A

Resilient spring locking action nut made from light-pressed alloy steel which provides a lightweight vibration-proof locking

71
Q

What three types of quick release fastener?

A

Dzus, Airloc, Camloc

72
Q

What two types of Dzus are there?

A

Light and heavy duty

73
Q

What are the most common keyway shapes?

A

Woodruff
Square
Pratt and whitney (sunken)
Gib head (tapered)

74
Q

How much of a rivet must extend out of the metal?

A

1.5D

75
Q

What two systems are in use for rivet codes?

A

AN system and MS

76
Q

What increments is the shank diameter in?

A

1/32

77
Q

What increments is the length given in?

A

1/16

78
Q

Which way round in the code are the diameter and length before and after the dash?

A

Diameter - Length

79
Q

What is the most common countersink angle?

A

100 degrees

80
Q

What is the recommended head protrusion for a countersink?

A

0.005 to 0.007 of an inch

81
Q

What does the rivet marking A denote?

A

Pure Aluminium

82
Q

How is the strength of pure aluminium rivet increased?

A

Cold worked

83
Q

What does the rivet marking AD denote?

A

Aluminium Alloy

84
Q

Why are AD rivets referred to as field rivets?

A

Because they require no heat treatment.

85
Q

What does the rivet marking cross denote?

A

Aluminium alloy with magnesium, they have the letter B in their code

86
Q

What does the rivet marking dimple denote?

A

2017 Aluminium Alloy rivet, they are very hard so must be installed frozen.

87
Q

What does the rivet marking double dash denote?

A

2024, super hard, have to be stored at -34 degrees to be soft enough for two weeks

88
Q

What does the rivet marking raised circle denote?

A

7075 rivet, heat treated zinc ally

89
Q

What does the rivet marking blank denote?

A

Corrosion resistant steel, code letter F

90
Q

What does the rivet marking double dimple denote?

A

Monel rivet, used as an alternative to cres when high shear strength is not req.

91
Q

How are titanium rivets denoted and do they require heat treating?

A

V or T and no

92
Q

Where is a pop rivet used?

A

Never on aircraft structure but sometimes used to line a hole up.

93
Q

Where are cherry friction lock rivets used?

A

On light aircraft.

94
Q

How much larger must a cherry friction lock be if it is replacing a solid?

A

0.8mm

95
Q

What is the key difference of mechanical lock rivet?

A

The stem is locked in.

96
Q

What are some examples of mechanical lock rivets?

A

Huck
Cherrylock
Olympiclok
Cherrymax

97
Q

Why are hucklocks generally limited to manufacturers?

A

Expensive tooling

98
Q

Can cherry locks replace solids?

A

Yes

99
Q

What is the benefit of olympic lok?

A

They are lightweight, they can be either countersunk or bulbed

100
Q

What is the advantage of cherrymax that makes them so common?

A

One tool fits all

101
Q

What is the ultimate strength of a cherrymax?

A

50ksi to 70ksi

102
Q

What is the temp range for cherrymax?

A

120 to 760 degrees c

103
Q

How is a mechanical lock rivet removed?

A

Flat filed onto head and stem punched out. Drill collar. Snap and punch it out.

104
Q

What three types of lockbolt are in use?

A

Pull
Blind
Stump

105
Q

How can you tell a shear lockbolt from a tension lockbolt?

A

Colour coded collar

106
Q

What alloys are hi-loks manufactured from?

A

Titanium
Stainless steel
Steel
Aluminium

107
Q

What fit should the hole for a hi lok be?

A

Interference

108
Q

What is a hi-tigue rivet?

A

Has a bead at the bottom of the shank that preloads the hole increasing joint strength.

109
Q
A

CAT B- Mod 6 Materials and Hardware (14 decks)

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