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M6 Resit > 6.5 Fasteners✅(12) > Flashcards

6.5 Fasteners✅(12) Flashcards

1
Q

The screw thread pitch on a screw, bolt or tapped hole can be determined and measured with what

A
  • a screw thread pitch gauge
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2
Q

Why is it important to periodically check all thread gauges?

A

to ensure they are not worn beyond allowable limits or damaged

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3
Q

Class 1 fit is a

A

loose fit

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4
Q

Class 2 fit is a

A

free fit

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5
Q

Class 3 fit is a

A

medium fit

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6
Q

Class 4 fit is a

A

close fit

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6
Q

Class 5 fit is a

A

tight fit

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7
Q

Generally, aircraft screws are manufactured with what class fit?

A

Class 2 (free fit)

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8
Q

Generally, aircraft bolts are almost always manufactured with what class

A

Class 3 fit (medium)

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9
Q

What class fit requires a wrench to turn a nut on to a bolt

A

Class 4 (close fit)

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10
Q

What class can be turned with fingers?

A

Class 1

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11
Q

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

A

right hand

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12
Q

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

A

left hand

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13
Q

Most screws and bolts have single lead threads (T or F)?

A

T

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14
Q

What are double, triple and quadruple threads also known as ?

A

multiple lead threads

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15
Q

What thread screw should be used when locking power is required

A

single lead thread

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16
Q

What is the lead

A
  • distance that a nut travels in 1 revolution
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17
Q

What is pitch?

A

distance from a point on 1 thread to the corresponding point on the next thread

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18
Q

What are the 3 most common thread standards

A
  • British standard thread forms
  • American National (AN) thread forms
  • Unified thread forms
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19
Q

What are the 4 British standard thread forms?

A
  • British standard whitworth (BSW)
  • British standard fine (BSF)
  • British standard pipe (BSP)
  • British Association (BA)
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20
Q

What are the 2 American National (AN) thread forms

A
  • ANC (American national coarse)
  • ANF (American national coarse fine)
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21
Q

What are the 3 unified thread forms?

A

UNC - Unified National Coarse
UNF - Unified National Fine
UNEF - Unified National Extra Fine

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22
Q

What is the thread angle for American national thread forms

A
  • 60*c
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23
Q

Coarse pitch screws would have less threads (T or F)

A

T

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24
Q

Fine pitch screws would have more threads (T or F)

A

T

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25
Q

What is a bolt designed to do

A

hold 2 or more items together

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26
Q

What shape bolts are typically used for airframe structural applications?

A

Hex heads

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27
Q

What is the bolts grip length?

A

length of unthreaded portion

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28
Q

What are aircraft bolts available in

A

-cadmium plated nickel steel
- corrosion-resistant steel
- 2024 aluminium alloy

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29
Q

Unless specified, what is the bolt made of

A

cadmium plated nickel steel

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30
Q

Generally, what does the marking on the head of a bolt identify?

A

identifies what the bolt is made out of

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31
Q

British standard whiteworth is coarse, general purpose and rapid dismantling (T or F)

A

T

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32
Q

British standard fine is finer than BSW, resists vibration (T or F)

A

T

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33
Q

What is the thread angle of British standard whitworth?

A

55*

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34
Q

What British thread form is used to resist vibration

A

British standard fine

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35
Q

What is the thread angle of British association (BA)

A

47.5*

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36
Q

What does BSP stand for

A

British standard pipe

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37
Q

Acme threads is made up at an angle of?

A

29*

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38
Q

What are square thread profiles used for

A

Power transmission

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39
Q

ACME thread is stronger than the square thread (T or F)

A

T

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40
Q

What are buttress thread profiles designed to handle?

A

heavy forces in one direction

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41
Q

When are clevis bolts used

A

when load applied is in shear

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42
Q

The diameter of a clevis bolt is given in?

A

1/16 inch (1.6mm) increments

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43
Q

Where are eyebolts used

A

where external tension loads are to be applied

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44
Q

The head of a eyebolt is specifically designed for the attachment of a turnbuckle which connects 2 wires together (T or F)?

A

T

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45
Q

What are close tolerance bolts

A

grounded to a tolerance of +0.000 - 0.0005 inch

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46
Q

Where must close tolerance bolts be used?

A

-areas that are subject to pounding loads

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47
Q

What mark is indicated on top of a close tolerance bolt

A
  • triangle mark
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48
Q

Where would you use internal wrenching bolts?

A

-areas subjected to high tensile loads

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49
Q

What wrench does a internal wrenching bolt accept

A

Allen wrench

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50
Q

Internal wrenching bolts have greater strength than a standard steel AN bolt (T or F)

A

T

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51
Q

The precision airframe bolts were developed and updated by whom

A
  • NAS (National aerospace standards)
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52
Q

All aircraft bolts except for AN bolts are measured by their grip length and not by their overall length (T or F)

A

T

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53
Q

What are the 2 basic type of nuts

A
  • self locking
  • Non self locking
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54
Q

Self locking nuts have a locking device to keep them from coming loose (T or F)

A

T

55
Q

What does non-self locking nuts rely on?

A

relies on cotter pin, check nut or lock washer to hold it in place

56
Q

If more than 3 threads are exposed when using a self locking nut, what should you do

A
  • replace bolt with correct length
  • install a washer
57
Q

What are the 2 general self locking nuts used in aviation?

A
  • fibre
  • nylon type (low temp)
58
Q

Nylon self locking nuts must not be used in any location where temperature could exceed what temperature

A

121c (250F)

59
Q

Nylon self locking nuts must not be used in any location where temperature could exceed 121c (250F). However they can be used on engines, in locations specified by the manufacturer (T or F)

A

T

60
Q

What is used when temperature exceeds 121c (250F)?

A
  • metal lock nuts are used
61
Q

How is a corrosion resistant nut identified?

A
  • by the letter C
62
Q

How is a aluminium alloy nut identified?

A
  • by the letter D
63
Q

When is a castle nut used

A

when bolt is subjected to either shear or tensile loads

64
Q

The castle nut is designed to fit on a standard airframe bolt with a class 3 fit (T or F)

A

T

65
Q

What is shear castle nuts used for

A

-Shear loads on clevis bolts

66
Q

What does a plain nut require to prevent the nut from shaking loose?

A

spring-type lock washer

67
Q

What is a check nut

A
  • a second nut that is tightened against a primary nut
68
Q

What are check nuts made out of

A

cadmium plated steel

69
Q

What is a engine nut not approved for?

A
  • airframe use
70
Q

Engine nuts are made out of heat treated steel and has national fine threads that produce a class 3 fit (T or F)?

A

T

71
Q

When is a wing nut used

A

when parts require frequent removal without the use of tools

72
Q

What class fit does wing nuts provide

A

class 2

73
Q

What are aircraft wing nuts made of?

A

-cadmium plated steel
-brass

74
Q

A stud is a shaft that is threaded at both ends (T or F)

A

T

75
Q

What does Heli-coil insert prevent

A

-Prevents thread from wear due to continual insertion and removal of both bolts and screws

76
Q

Heli-coil inserts are available for all thread standards (T or F)

A

T

77
Q

What is the Heli-coil tolerance?

A
  • 0.0005mm (0.0002in)
78
Q

Heli-coil inserts allow each thread to adjust to the screw (T or F)

A

T

79
Q

The first threads of a Heli-coil insert, carries how much load in percentage?

A

45%-50%

80
Q

What are the 3 basic classification of screws?

A
  • Machine screws
  • structural screws
  • Self-tapping screws
81
Q

Machine screws are extensively for attaching fairings, inspection plates, fluid line clamps, and other light structural parts (T or F)

A

T

82
Q

What is the main difference between aircraft bolts and machine screws?

A
  • Threads on machine screws usually run the full length of the shank
83
Q

How are structural screws made

A
  • made of alloy steel and are heat treated
84
Q

What type of thread does a self tapping screw have

A
  • coarse
85
Q

What is the self tapping screws used for?

A
  • to hold thin sheets of metal, plastic, or plywood together
86
Q

What is a type A screw (self tapping screws)?

A
  • Sharp point
87
Q

What is a type B screw (self tapping screws)?

A
  • Blunt point
88
Q

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

A
  • Round head
  • Truss head
  • Counter sunk
  • Counter sunk oval screw
89
Q

What can dowels be made out of

A
  • wood, plastic, or metal
90
Q

What is a dowel used for?

A
  • Precision alignment of 2 mating surfaces
91
Q

What are the 3 commonly used lock washers in the aviation industry?

A
  • spring
  • tab
    -shakeproof
92
Q

Lock washers are made of steel and are twisted so that when a nut is tightened against it, the spring action of washer creates a strong friction force (T or F)

A

T

93
Q

What is a spring washer

A
  • when tightened, spring is compressed and creates friction which prevents nut from vibrating loose
94
Q

How many tabs does a tab washer have

A

-Has 2 or more tabs

95
Q

How does a tab washer work

A
  • one tab is bent against one flat nut
  • other tab is bent over an edge/slot or hole
96
Q

Can you re-use a tab washer

A

No

97
Q

How is the shakeproof washer preventing the tendency to unscrew?

A
  • By the sharp edges of the serrations
98
Q

Can a shakeproof washer be re-used

A

yes providing they retain their springiness

99
Q

What is lock wire commonly made out of

A
  • Stainless steel
100
Q

Lock wiring is critical and used where inspection intervals may be infrequent (T or F)

A

T

101
Q

Lock wiring must have 6-8 twists per inch (T or F)

A

T

102
Q

What are the 3 common quick release fasteners

A
  • Dzus
  • Camlock
  • Airloc
103
Q

What are the 2 types of Dzus fasteners

A
  • light duty
  • heavy duty
104
Q

What is the main difference between the 2 types of Dzus fasteners

A
  • Heavy duty fasteners have a grommet
105
Q

What are the 2 types of Airloc receptacles available?

A
  • fixed type
  • floating type
106
Q

The floating type (airloc) enables easier alignment (T or F)

A

T

107
Q

What can Camloc fasteners be referred as

A

quarter turn fasteners

108
Q

What does a quick turn fastener usually consist of

A
  • Stud (male)
  • Washer
  • Receptacle (female)
109
Q

What are circlips used for

A

retaining shafts, seals and bearings

110
Q

Special pliers are used to install or remove a circlip (T or F)

A

T

111
Q

A key is a specially shaped piece of metal, which is a hardened piece of metal that fits into cut outs (keyways) in wheels, discs, sprockets or gears (T or F)

A

T

112
Q

What is the most used technique to join aluminium?

A

riveting

113
Q

Before a rivet is driven, it must extend beyond the base material at least x1.5 rivet diameter (T or F)

A

T

114
Q

What is the common countersink angle?

A

100*

115
Q

What is the rivet code for universal head?

A

AN470

116
Q

What is the rivet code for round head?

A

AN430

117
Q

What is the rivet code for countersunk rivets

A

AN426

118
Q

What is dimpling

A
  • Process that mechanically ‘dents’ the sheet to accommodate for rivet head
119
Q

What are the majority of aircraft rivets made of

A

aluminium alloy

120
Q

What are the 4 lock rivets

A
  • Huck Loks
  • Cherrylock
  • Olympic loks
  • Cherry max
121
Q

What were Huck Lok used for

A
  • structural replacements for solid shank rivets
122
Q

Olympic Lok blind fasteners are light weight, mechanically locking spindle type blind rivets (T or F)

A

T

123
Q

Why would you use a CherryMAX rivte

A
  • economical
  • strong enough to replace solid shank rivets
124
Q

What are lockbolts used for

A
  • To assemble 2 materials permanently
125
Q

What are the 3 lockbolts used in aviation

A
  • Pull-type
  • Blind-type
  • Stump-type
126
Q

Lockbolts are available for both shear and tension lockbolts (T or F)

A

T

127
Q

Taper-Lok are the strongest special fasteners used in aircraft construction (T or F)

A

T

128
Q

what is run out?

A

Part of the thread where the thread transitions to the shank

129
Q

A bolt drilled for wire locking would be identified by

A

Letter H following part number

130
Q

A self locking nut must be screwed onto a bolt until all the chamfer on the bolts end protrudes through the insert or:

A

at least one, but not more than 3 threads, protrude through the nut

131
Q

What are ganged anchor nuts

A

Floating type anchor nuts installed in channel riveted to the structure

132
Q

Maximum number of bolts secured together by locking wire is

A

3

133
Q

What are the 2 common head shapes for solid shank rivets

A

Universal and countersunk

134
Q

What are the 4 types of studs

A
  • Standard
  • waisted
  • stepped
  • shouldered

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