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Materials And Hardware > Fasteners > Flashcards

Fasteners Flashcards

1
Q

What is a screw thread?

A

Ridge cut into screw

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2
Q

What is the thread in clockwise?

A

Right hand thread

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3
Q

What is the thread in anti-clockwise?

A

Left hand thread

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4
Q

What is the form of a screw thread?

A

Shape of one complete contour of thread between corresponding points in the crest

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5
Q

What is the crest?

A

Prominent point of thread whether male or female

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6
Q

What is male?

A

External thread

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7
Q

What is female?

A

Internal thread

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8
Q

What is the root?

A

Bottom point of thread groove

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9
Q

What is the flank?

A

Slope of thread between root and crest

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10
Q

What is the thread angle?

A

Angle between two adjacent flanks

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11
Q

What is the major diameter in…

Male?

Female?

A

Male - the diameter of the crest

Female - the diameter of the root

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12
Q

What is the minor diameter in…

Male?

Female?

A

Male - the diameter of the root

Female - the diameter of the crest

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13
Q

What is the depth?

A

Radial distance between root and crest

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14
Q

What is the pitch?

A

Crest to crest

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15
Q

What is the lead?

A

Distance moved in one turn

Single start thread - lead is same as pitch

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16
Q

What is the runout?

A

Part of thread where minor diameter increases until it equals the major diameter (the plain part)

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17
Q

What are thread forms?

A

Formed by one continuous groove (in a single start thread)

Double start thread - double distance covered

Triple start thread - triple distance covered

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18
Q

What does BS stand for?

A

British Standards

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19
Q

What does BA stand for?

Angle?

A

British Association

47.5 degrees

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20
Q

What does BSW stand for?

What is it for?

A

British Standard Whitworth

General purpose

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21
Q

What does BSF stand for?

Used for?

A

British Standard Fine (fine threads)

High vibration

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22
Q

What does BSP stand for?

Used for?

A

British Standard Pipe

Pipeline couplings

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23
Q

What is the smallest screw?

Used for?

A

Anything under 1/4” diameter

Used for small electrical parts

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24
Q

What does ANC stand for?

A

American National Coarse

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25
Q

What does ANF stand for?

Angle?

A

American National Fine

60 degrees

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26
Q

What does UNC stand for?

A

Unified National Coarse

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27
Q

What does UNF stand for?

A

Unified National Fine

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28
Q

What does UNEF stand for?

A

Unified National Extra Fine

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29
Q

What is the Unified angle?

Identification?

A

60 degrees

Rings like olympics

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30
Q

Which thread will have a stronger lead than fine pitch?

A

Coarsed pitch

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31
Q

Three types of thread pitch?

A

Square thread
Butteress thread
Acme thread

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32
Q

What is the most common thread used?

A

Symmetrical V thread

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33
Q

How is a bolt tightened?

A

With a nut

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34
Q

How is a screw tightened?

A

Into a threaded hole

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35
Q

How do you install a bolt or screw?

A

Install so if they are loose, they remain head upwards/in direction of rotation

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36
Q

How much thread should be showing?

A

0.8mm

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37
Q

Typical fasteners?

A 
Hexagon drilled (1 hole) 
Internal wrenching 
Internal wrenching drilled 
Hexagon slotted 
100 degrees countersunk (cross recess) 
Cylindrical hexagon wrenching 
Pan (cross recess) 
Hexagon drilled (6 holes) 
12 point extended washer
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38
Q

Most part numbers will break down into what?

A 
Grip
Length 
Diameter 
Drillings 
Finish
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39
Q

What does X stand for?

A

Steel

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40
Q

What does X in a triangle stand for?

A

Steel, close tolerance

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41
Q

What does a - stand for?

A

Corrosion resistant steel (CRS)

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42
Q

What does - and a triangle stand for?

A

CRS, close tolerance

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43
Q

What does - - stand for?

A

Aluminium

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44
Q

What does -triangle- stand for?

A

Aluminium alloy, close tolerance

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45
Q

What does U stand for in a code?

A

Unplated

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46
Q

What does - stand for in a code?

A

Plated

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47
Q

What does D stand for in a code?

A

Drilled shank

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48
Q

What does H stand for in a code?

A

Drilled head

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49
Q

What does the number after the letter mean in a code?

A

Grip length

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50
Q

Grip length of a bolt should equal what?

A

Thickness of material

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51
Q

Materials of more than 2.4mm have what?

A

Two threads inside hole

52
Q

Materials less than 2.4mm have what?

A

No threads inside hole

53
Q

What is the maximum number of washers used to overcome grip strength?

A

3

54
Q

What is a standard stud?

A

Threaded all the way

55
Q

What is a waisted stud?

A

Threaded on each end

56
Q

What is a shouldered stud?

A

Threaded on each end and a ring in the middle

57
Q

What is a stepped stud?

A

Threaded on each end, thicker at one end

58
Q

What are studs classified by?

A

Diameter
Length
Thread type

59
Q

Three types of stud fittings?

A

Stud box
Stud insertion/removal tool
Lock nuts

60
Q

Methods of stud removal

A

Lock nuts
Filed flats
Ezi-outs

61
Q

Properties of self-tapping screws

A

Thin gauge sheet metal parts
Drilled holes
Generates own thread
Slotted and cruciform head types

62
Q

What is a Shear Castle Nut?

A

Used same as castle but, but in areas that have lower tensile loads

63
Q

What is a Castle Nut?

A

Used with drilled shanks and locked with a split pin

64
Q

What is a slotted engine nut?

A

Designed to be put in high temperature areas

65
Q

What is a wing nut?

A

Internal, finger tightened nut. Used for frequently opened areas

66
Q

What is a plain nut?

A

Takes high tensile loads. Requires locking device

67
Q

What is a check nut?

A

Used as a locking device for plain nuts

68
Q

What is a lock nut?

A

Thin, plain nut. Tightened firmly onto main nut, wedges both onto threads. Friction lock

69
Q

What is a Nyloc Stiffnut?

A

Unthreaded Nylon insert. Friction prevents loosening. Low temperature only

70
Q

What is an Oddie stiffnut?

A

Six springey tongues, bent inwards, forms a circle less than diameter of root of bolt thread, grips bolt thread

71
Q

What are Aerotight and Philidas?

A

Slotted locking extensions, misaligned threads, realigned by bolt thread, grips thread

72
Q

What type of slit does Aerotight have?

A

Vertical slit

73
Q

What type of slit does Philidas have?

A

Horizontal slit

74
Q

What are Anchor nuts?

Types?

A

Fixed nuts, riveted

Two-leg anchor nut 
One-leg anchor nut 
Corner anchor nut 
Right-angle anchor nut 
High-temp two-leg anchor nut 
Two-leg floating anchor nut 
Ganged or strip anchor nut
75
Q

What are High-temp self-locking nuts?

A 
Used in 120C+ areas 
CRES, Steel alloy, silver plated CRES
Friction locking 
Threads out of phase 
Pinched thread end section
76
Q

What are Low-temp self-locking nuts?

A 
Used in 121C Max areas
Smaller diameter 
Fibre/nylon insert 
Bolt thread cuts own thread tapping into insert, at least one thread showing through the nut
Do not use if finger tightened
77
Q

Two types of Heli-Coil Inserts?

A 
Standard free running 
Screw lock (internal locking)
78
Q

What are Heli-Coils manufactured from?

A

Round wire into diamond profile

79
Q

How to install Heli-Coils?

A

Drill hole
Special thread tapping
Thread gauge (go/no-go)
Fit Heli-coil - insert key, engage tang in driving slot, no downward pressure, at least 1/2 pitch below surface, snap off tang

80
Q

How to remove Heli-coils?

A

Bend top coil inwards, creating a tang, unscrew, use an insertion tool/pliers, may use tapered left hand tap of correct size which grips internal threads, post removal examine hole threads prior to filling new insert

81
Q

Safetying methods

A 
Wire locking 
Split pins 
Lock-washers 
Locking plates 
Snap-rings (circlips) 
Self-locking nuts
82
Q

Two wire-locking methods?

A

Single - small screws, closed geometric pattern, electrical systems, hard to access areas

Double - preferred, twist/inch 8-10 twists

83
Q

Three types of washers?

A

Spring Washer - single/double coil spring, friction set up

Tab Washer - anchors on component, tab bends over a flat. Do not reuse

Shakesproof Washer - spring Steel, slanting serrations, sharp edges prevent unscrewing, reusable

84
Q

Types of locking devices?

A 
Pip-pin
Camloc
Dzus 
Airloc
Split pin
85
Q

What is a pit-pin?

A

Non threaded

Quick

86
Q

What is Camloc?

A 
Four principle parts: 
Receptacle 
Grommet 
Retaining ring 
Stud assembly
87
Q

What is Dzus?

A 
Two types: 
Light duty (access covers, etc) 
Heavy duty (cowlings, etc)

Spring
Stud
Grommet (heavy only)

88
Q

What is Airloc?

A

Receptacle riveted to access panel frame
Stud
Cross pin
Fixed and floating types

89
Q

What is Split pin?

A

Materials:
Low Carbon
Stainless steel (CRES)

Measured to shortest prong
CRES non-magnetic areas (compasses)
Good fit - not loose

90
Q

What do keys do?

Agreed standard taper?

A

Transmit drive from lock shaft to hub when mating surfaces are smooth. Used in parts that don’t require frequent separation

1:100

91
Q

Four types of keys?

A

Hollow or flat saddle
Gib-headed
Feather
Woodruff

92
Q

What is a hollow/flat saddle?

A

Not suitable for heavy loads

93
Q

What is a Gib-headed?

A

Sits on the end, locks everything in place

94
Q

What is Feather?

A

When axial movement is required between hub and shaft

95
Q

What is Woodruff?

A

Fits in like the letter D

96
Q

Which rivets are used “as fabricated”?

What are they used for?

A

1100 Aluminium

Attach aluminium components where low strength is needed

97
Q

Which three rivets are heat treated and used when medium strength is needed?

A

2017, 2117, 7050

98
Q

Which rivets are supplied in -T4 condition, need heat treated, and are used when high strength is needed?

A

2024

99
Q

What are Monel Rivets?

A

Without heat treatment before use, are used in steel, titanium, or aluminium alloy riveted assemblies

100
Q

What are Titanium Rivets?

A

Rivets with a cylindrical or a partially tapered shank. No heat treatment

101
Q

What must rivet shear strength match?

A

The bearing strength

102
Q

Usually the rivet diameter is at least…

A

3x sheet thickness

103
Q

Four types of rivets?

A

Snap head
Universal
Mushroom
Countersunk (100 degrees is used)

104
Q

What is 1100?

Letter?

Head marking?

A

Aluminium

A

No marking

105
Q

What is 2017?

Letter?

Head marking?

A

Aluminium alloy

D

Raised dot

106
Q

What is 2117?

Letter?

Head marking?

A

Aluminium alloy

AD

Small dimple

107
Q

What is 2024?

Letter?

Head marking?

A

Aluminium alloy

DD

Two raised dashes

108
Q

What is 5056?

Letter?

Head marking?

A

Aluminium alloy

B

Raised cross

109
Q

Which aluminium alloys need heat treated?

A 
2024 DD 
2017 D (?)
110
Q

What letter is used for CRES?

Head marking?

A

F

No markings

111
Q

What is sometimes used instead of CRES?

Letter?

Head marking?

A

Monel

M

Two dimples
Raised “R”

112
Q

What is the letter for Titanium?

Head marking?

A

T

Raised “V”
Or raised “T”

113
Q

What does M52040 AD - 5 - 12 mean?

A

20 - universal head
AD - Material designation 2117 T4
5 - diameter in 32nds
12 - length in 16ths

114
Q

What are Hi-lok fasteners?

Tools?

A

Two parts:
Threaded pin with a lead universal or CSK
Collar with internal thread and shear groove

Tools: 
Allen key (holds pin) 
Hex drive (turns collar)

The axis of the fastener hole must be perpendicular to the surface on which the fastener lead will sit

115
Q

On a Hi-lok, what do aluminium collars max at?

CRES collars?

A

3 degrees

0.5 degrees

116
Q

How to install Hi-loks?

A

Check grip length
Pins and collars match
Lubricate if required
Install by hand or power

117
Q

What are the collar colours?

Oversizes?

A

Red - 1/64
Black - 3/64
Blue - 1/32
Chromium plate - varies

118
Q

What are Hi-lites?

A

Very similar to hi-loks
Less material
15% lighter than hi-lok
Weight saving

119
Q

What are Taper-loks?

A

Tapered bolt and self locking nut
Used in high fatigue areas
Good sealing effect
Do not remove lubricant

120
Q

What are Lockbolts?

A 
Strong and light 
Two piece assembly - pin and collar 
Ensure collar face is correct way 
Wet-installed with sealant 
Do not remove lubricant
121
Q

What are Cherrylock Blind rivets?

A

Three types:
Standard
Bulbed
Oversize

Body, pin, locking collar

Do not remove lubricant

122
Q

What are Cherrymax rivets?

A

Two types:
Cherrymax
Oversize cherrymax

One piece

Body, pin, collar

Driving anvil detaches - protects tooling

123
Q

How to measure grip length?

A

Put scale in hole
Hook onto rear face of material
Read thickness

124
Q

What are Olympic-lok rivets?

A

Light
Three piece mechanically locked
Never file stem - weakens lock
Only use Olympic tools

125
Q

What are Rivnuts?

A

Rivet and nut combination

Creates a threaded location allowing screw fit in thin sheet metal

Materials And Hardware (11 decks)

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