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Fasteners Flashcards

1
Q

What is a right hand thread

A

A thread cut in a clockwise direction most screws are right hand

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2
Q

What is left hand thread

A

A screw cut in the anti clockwise direction

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3
Q

What is the lead

A

Distance moved in one complete revolution

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4
Q

What is the form

A

The shape of one complete contour

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5
Q

What is the crest

A

The prominent point in the thread

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6
Q

What is the root

A

The bottom point in the thread grove

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7
Q

What is the flank

A

The slope of the thread between the roots and crest

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8
Q

What is the thread angle

A

Angle between 2 adjacent flanks

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9
Q

What is the major diameter

A

On male crest to crest

Female root to root

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10
Q

What is the minor diameter

A

Male root to root

Female crest to crest

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11
Q

What is the pitch

A

The distance of crest to crest on the same pitch

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12
Q

What is the run out

A

There the thread begans to Become straight

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13
Q

What is the depth

A

Radial distance between the food and the crest

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14
Q

What is a single start

A

Lead = pitch

In one resolution the distance travel so one crest to crest

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15
Q

What is a 2 start

A

Lead = 2x pitch

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16
Q

What is BS

A

British standards

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17
Q

What is BA

A

British association

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18
Q

What is AN

A

American national

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19
Q

What is a BSW

A

British standards whitworth
For general purpose
Angle of 55

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20
Q

What is BSF

A

British standard fine
Finner version of BSW has more threads and less diameter
Has resistance to vibration
55 angle

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21
Q

What is a BSP

A 
British standard pipe 
Fine pitch
Used for pipeline couplings 
Strong connection 
Can be tapered to make a pressure tight joint 
55 angle
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22
Q

What is BA

A

British association
47.5 angle
Only in sizes 1/4 inch
Use for smaller mechanical or electrical parts
Range from sizes 0 to 10 the smaller the number the higher the thread

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23
Q

What is ANC and ANF

A

American national coarse and fine

60 angle

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24
Q

What is a UF

A 
Unified thread 
ID by machines symbol and mark 
60 angle 
UNC – Unified National Coarse
• UNF – Unified National Fine
• UNEF – Unified National Extra Fine
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25
Q

What is TPI

A

Thread per inch

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26
Q

What is a deeper thread

A

Less threads per inch

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27
Q

What is the distance between course and fine pitch

A

A coarse pitch thread has a greater lead than a fine pitch thread of the same major diameter

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28
Q

What is a buttress thread

A

Can only transmit power in one direction

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29
Q

What is the thread depth that should be showing

A

1/32 inch

0.8mm

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30
Q

What material is a boot with a cross on

A

Steel

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31
Q

What material is a bolt with a line on

A

Crosion resistant steel

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32
Q

What material is a bolt with 2 dashes

A

Aluminium

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33
Q

What is U in a part number

A

Unplated

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34
Q

What is a - on a bolt identification

A

Plated

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35
Q

What is D on a bolt identification

A

Drilled shank

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36
Q

What is H on a bolt identification

A

Drilled head

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37
Q

What is single number on a bolt identification

A

Grip length , measured in 16th

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38
Q

What is X on a bolt identification

A

1/64inch oversized

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39
Q

What is Y on a bolt identification

A

1/32 inch oversized

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40
Q

What is NE on a bolt identification

A

Long threaded

Boeing only

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41
Q

What is NF on a bolt identification

A

Short threaded

Boeing only

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42
Q

What do material less than 2.4mm

A

No threads inside hole

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43
Q

What do materials with greater than 2.4 mm have

A

Two threads inside the hole

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44
Q

What is the max number of washes used

A

3

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45
Q

What is the grip length of a bolt be equal to

A

The material thickness

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46
Q

What are the 4 types of studs

A

Standard
Waisted
Stepped
Shouldered

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47
Q

What is a stud

A

A price is rod with a thread at each end and with a plain portion in the middle

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48
Q

Why is stranded stud used

A

Most widely used

Same diameter

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49
Q

What is a waisted stud

A

Same strength

Saves weight

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50
Q

What is a stepped stud

A

Provide a strong Anchorage

Used for soft material

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51
Q

What is shouldered stud

A

Maximum rigidity is required against the lateral strength

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52
Q

What is a stud box

A

Used to fit a stud
Screwed at one end
Used into price
Stud removed

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53
Q

What is an stud insertion or removal tool

A

Insertied into thread by hand
Inserting tool places over the protruding end
Locked together

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54
Q

What is a lock nut

A

Screwed into outer frame of the stud and locked firmly together
Screwed into housing

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55
Q

What is filed flat

A

Removal of damaged studs

Only if surface is protruding

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56
Q

What is ezi-out

A

When a stud is broken below the surface
Drill hole in stud
Remove using a ezi-out tool

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57
Q

What is structural screw

A

Used for assembly
Made of alloy steel
Are Heat treated
Same strength as bolts , only have different heads

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58
Q

What is flush head

A

Flush-head machine screws are used in countersunk holes where a flush finish is desired. These screws are available in 82 and 100 degrees of head angle and have various types of recesses and slots for driving.

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59
Q

What is round head

A

Round-head machine screws are frequently used to assemble highly stressed aircraft components.

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60
Q

What is fillister head

A

Fillister-head machine screws are used as general-purpose screws. They may also be used as cap screws in light applications, such as the attachment of cast aluminium gearbox cover plates.

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61
Q

What is socket head

A

Socket-head machine screws are designed to be screwed into tapped holes by internal wrenching. They are used in applications that require high-strength precision products, compactness of the assembled parts, or sinking of the head into holes.

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62
Q

What is a self tapping screw

A

cuts its own internal threads as it is turned into the hole. Self-tapping screws can be used only in comparatively soft metals and materials.

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63
Q

What is a machine self tapping screw

A

Used for removable parts
Nameplates castings
Hole needs to be pre drilled

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64
Q

What is sheet metal slef tapping screws

A

Temporary attaching sheet metal for riveting

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65
Q

What is a non slef locking nut

A

These are used with drilled-shank hex-head bolts, clevis bolts, eye bolts or struts and are designed to accommodate a cotter pin or wire locking as a means of safetying.

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66
Q

What is a shear castle nut

A

Used only for shear load on clevis bolts.

These nuts are available in cadmium-plated nickel steel, corrosion-resistant steel and in 2024 aluminium alloy.

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67
Q

What is a castle nut

A

These nuts are designed to fit on standard airframe bolts and may be used when the bolt is subjected to either shear or tensile loads. They are made from the same material as the shear castle nut.

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68
Q

What is a slotted engine nut

A

This nut is designed for use on an aircraft engine and is not approved for airframe use. It is made of heat-treated steel.

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69
Q

What is a wing nut

A

Wing nuts are intended for use on hose clamps and battery connections, etc., where the desired tightness is ordinarily obtained by the use of fingers. They are made of either cadmium-plated steel or brass.

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70
Q

What is a locking nut

A

A lock nut is a thin, plain nut which is tightened down firmly onto the main, plain nut. This friction wedges the threads to prevent them both slackening.

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71
Q

What is a nylon stiffnuts

A

This nut has an unthreaded nylon insert permanently housed at the outer end. As the bolt threads engage the insert, the nylon is compressed into them, setting up a friction which prevents the nut unscrewing. Low temperature use only.

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72
Q

What is a oddie stiffnut

A

Oddie stiffnuts have six tongues at their outer end which are bent inwards
to form a circle slightly less in diameter than the root of the bolt thread. As the bolt passes through the nut, the tongues are pushed upwards, applying a locking load onto the bolt thread.

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73
Q

What is a Aerotight and Philidas Stiffnuts

A

These nuts have slotted locking extensions which are closed during manufacture to put the screw-thread out of alignment. As the bolt engages and realigns the extension thread, a grip is produced which provides a friction lock.

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74
Q

What is a anchor nut

A

A floating type anchor nut is used when a slight range of movement is necessary to ensure the bolt can locate

75
Q

What is High-Temperature Self-Locking Nuts

A

Above 120 degrees
All metal locknuts
Made is steel CRES
Not in contact with aluminium

76
Q

What is Low-Temperature Self-Locking Nuts

A

Temps under 121 degree

Fibre or nylon

77
Q

What is a heli coil inset

A

Protect soft metal casing
Available for all thread types
Tang and notch

78
Q

What is C

79
Q

What is F

A

Carbon steel

80
Q

What is N

A

Ni cr fe alloy

81
Q

What is wire locking

A

Double twist

3 inch max gap

82
Q

What is a spring washer

A

This is either a single coil or square section spring with sharp corners or
a double-coil spring. It is fitted beneath the nut so that when the nut is tightened the spring is compressed, setting up a friction and thus preventing the nut from vibrating loose.

83
Q

What is a tab washer

A

Plain nuts

One tab is ment against the other over edge is component

84
Q

What is difference between transition thread and normal thread

A

Normal threads have a symmetrical V shape

85
Q

What does a triangle mean on a bolt head

A

Close tolerance

86
Q

Can you used a slotted nut in air frame

87
Q

When can you re use nyloc stiffnuts

A

If you can finger tighten cant used it

88
Q

What direction do aerotight stuff nuts go in

89
Q

What is a heli coil fitter

A

Supplied by manufacturer
Straight fluted for hand tapping
Sprial for machine tapping

90
Q

What is the depth of a heli coil

A

Half a thread down

91
Q

What is safetying

A

Securing all air craft nuts and bolts so don’t come use

92
Q

What is single locking sure used

A

In small parts

93
Q

What is a shakeproof washer

A

If it still has sharp teeth can be re used

The teeth grip into nuts

94
Q

What safteying devices cant be reused

A 
Lock nuts 
nylon threaded 
Split pins 
Wire locking 
Tab washers
95
Q

2 types of pip pin

A

Ring pool

Double acting

96
Q

What is the difference between the 2 types of dzus

A

Heavy type has a grommet light weight doesn’t

97
Q

What is light duty type dzus fasteners used for

A

Box covers

Access hole lightweight fairing

98
Q

What is heavy duty type dzus used for

A

Cowlings

Heavy fairing

99
Q

What are split pins used for

A

Secure bolts screws nuts and pins

100
Q

What materials are split pins made of

A

Low carbon steel

Stainless steel

101
Q

What split pin materials are used in non-magnetic need

A

Stainless steel cotter pins

102
Q

What is A rivet

A

1100 aluminium alloy
No mark
No heat treat

103
Q

What is 2117 rivet

A

Aluminium alloy
Code AD
Flat dimple
No heat treat

104
Q

What is 2017 rivet

A

Aluminium alloy
Code D
Heat treat above 3/16 diameter
Raised dot

105
Q

What is a DD alloy

A

2024 aluminium alloy
Raised double dash
Solution heat treated

106
Q

What is 7050 rivet

A

Aluminium alloy
Code E
Raised ring

107
Q

What is B rivet

A

5056 aluminium alloy

Raised cross

108
Q

What is F rivet

A

Corrosion resistant steel

No mark

109
Q

What is Monel rivet

A

Symbol M

2 dimples or R symbol

110
Q

What is T rivet

A

Titanium

Raised V or T

111
Q

What is 426 on a rivet

A

100 degrees counter sunk head

112
Q

What is 470 on a rivet

A

University head

113
Q

What are the types of High lock fasteners

A

A threaded pin with a head (universalorcountersink)

A collar with an internal thread and an external shear groove

114
Q

What is a special fasteners

A

With a close tolerance

115
Q

What are the types of fit

A

Clarence - rivet smaller than hole
Transition
Interference - rivet bigger than hole - tight to get in

116
Q

Aluminium alloys what sort of fit do hi-locks have

A

Interference

117
Q

How to insert hi-lock

A

Allan key holds pin

Hex drive turns collar

118
Q

What is important in hi lok

A

The collar is the right size
And right way round
Has to sit on parallel surface

119
Q

What is the maximum out of parallel surfed for a aluminium collar

120
Q

What is the maximum out of parallel degrees for a CRES collar

A

0.5 degrees

121
Q

How to insert hi-lok fasteners

A

Check grip length
Pins and colar match up
Lubricate if required
Install my hand or power

122
Q

What is the difference between hi-lok and hi-lite

A

Hi-lite has less material , as less run out , up to 15% lighter , it is weight saving

123
Q

What is a red collar

A

Material 2024

1/64 oversizes

124
Q

What is a blue colar

A

Material 2024

1/32 oversized

125
Q

What is the difference between red and blue colour

A

The sizes of the diameter oversizes

126
Q

What is a black collar

A

Material 2024

3/64 oversized

127
Q

When you fit a taper lok

A

The same way as any bolt

128
Q

why are taper lok used

A

Distribution of stress

Used in high fatigue areas

129
Q

What is the ratio of a taper bolt

130
Q

How to taper lok Come from supplier

A

With a special lubrications

131
Q

How to ensure a high precision hole

A

Reaming

Drill and clamp parts

132
Q

Who can fit taper lok

A

Only approved operators

Skilled people

133
Q

Why used hi-lok hi-lite

A

Gets a much better seal

Used for fuel tanks

134
Q

When are lockbolts used

A

Tension and sheer leadings

135
Q

What are the pieces of a lock bolt

A

Pin and collar

136
Q

What are the properties of a pin and collar

A

Strong and light

137
Q

Can lockbolts be used in non parallel surfaces

138
Q

What is the maximum out of parallel degree for CRES in a lockbolt

139
Q

What is the maximum out of parallel degrees of a titanium lockbolt collar in tension stress

140
Q

What is the maximum out of parallel degrees of a titanium lockbolt collar in shear stress

141
Q

What are the 3 types of cherrylock

A

Standard
Bulbed
oversizes

142
Q

What are the 3 parts of a cherrylock blind rivet

A

Body
Pin
Lock-collar

143
Q

What are the 2 types 0f Cherrymax rivet

A

Cherrymax

Oversized cherrymax

144
Q

What are they 3 parts of a cherrymax

A

Body
Pin
Locking collar

145
Q

What is the difference between a cherrymax and a cherrylock

A

Can used any tool to insert a cherrymax

Need specialist tool for cherrylock

146
Q

Properties of Olympic lock rivet

A

Light 3 piece mechanical locked rivet

147
Q

What shouldn’t you do on a Olympic-lok rivet

A

Never file stem off after it’s cu

Will weaken full rivet

148
Q

What tools should you use on Olympic lok

A

Specialist

149
Q

What is a rivnut

A

Rivet and nut combo

150
Q

What is a oddie stiffnut

A

Have six tongues
Bent inward to form a circle
As the bolt passes through the tongues are pushed upward applying a locking load into bolt thread

151
Q

When is a anchor nut used

A

When a slight range of movement is necessary to ensure the bolt can locate

152
Q

What is a strip nut

A

Used when a row of anchor nuts is required

Fitted at equal intervals

153
Q

What are High-Temperature Self-Locking Nuts made of

A

Steel alloy
CRES
Silver plated

154
Q

What are Low-Temperature Self-Locking Nuts

A

Fibre or nylon

155
Q

What are helo-coil use for

A

Soft metals l

156
Q

What is the twists per inch of locking wire

A

AMM chapter 20

157
Q

What is a spring washer

A

Fitted beneath the nut so that when the nut is tightened the spring is compressed, setting up a friction and thus preventing the nut from vibrating loose.

158
Q

What is the tab washer

A

Metal washer with 2 or more tabs

Cannot be removed

159
Q

What is a shake proof washer

A

Has sharp edges sticking out

Can be tightened and go over sharo edges but can’t go reverse order

160
Q

What are locking plates used

A

Instead of tab washer where repeated removal of bolt is required

161
Q

What is a pip pin

A

Simple and secure
Non threaded fastener
Allows the rapid installation and removal of parts without tooling

162
Q

What is a ring pull detent pin

A

A single ball locates the pin, no positive lock
Push to insert
Pull to remove

163
Q

What is a grommet

A

sheet metal ring held in the access panel by the retaining ring.

164
Q

What are the types of grommets

A

Flush and protruding

165
Q

What is a stud assembly consists of

A
  • Stud
  • Cross pin
  • Spring
  • Spring cup
166
Q

What type of Dzus fasteners have a grommet

A

Heavy duty

167
Q

What are the 2 types of airloc

A

Fixed type

Floating type

168
Q

What is a airloc made of

A

Receptacle
Stud
Cross pin

169
Q

What is a floating type airloc used

A

Makes for easier alignment of the stud in the receptacle

170
Q

What is a cotter pin used for

A

used to secure bolts, screws, nuts and pins.

171
Q

What are cotter pins

A

low-carbon steel, while others consist of stainless steel, and thus are more resistant to corrosion.

172
Q

What are stainless steel cotter pins used for

A

Where non magnetic material is required

173
Q

What is a hollow saddle key

A

Hollowed to fit the radius of the shaft
I driven into the position
Transmit a moderate load
No keyway cut into shaft so can’t have heavy load

174
Q

What is a flat saddle key

A

This rectangular or square-section key is driven into a keyway in the hub and bears upon a flat on the shaft. It provides a more positive drive than that achieved by the hollow saddle key.

175
Q

What is a gib headed key

A

Tapered key
Must be perfectly aligned
Can carry a great load

176
Q

What is a feather key

A

When axial movement is required

Used in geat box

177
Q

What is a woodruff key

A

Capital D

Suitable for parallel or taper shafts

178
Q

What is a rule of thump for choosing a rivet

A

choose a rivet whose diameter is at least 3 times the thickness of the thickest sheet being joined

179
Q

How to measure length of countersunk head

A

From the very top to the bottem

180
Q

How to measure length of a universal head

A

The length of shaft

181
Q

What is a AN 430

A

Round head

182
Q

What is AN 456

A

Brazier head

183
Q

What are the 3 Olympic loc head

A
  • Universal (protruding)
  • 100° flush countersunk
  • 100° flush shear

M6 (13 decks)

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