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Fasteners Flashcards

(125 cards)

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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
What does ANF stand for? Angle?
American National Fine 60 degrees
26
What does UNC stand for?
Unified National Coarse
27
What does UNF stand for?
Unified National Fine
28
What does UNEF stand for?
Unified National Extra Fine
29
What is the Unified angle? Identification?
60 degrees Rings like olympics
30
Which thread will have a stronger lead than fine pitch?
Coarsed pitch
31
Three types of thread pitch?
Square thread Butteress thread Acme thread
32
What is the most common thread used?
Symmetrical V thread
33
How is a bolt tightened?
With a nut
34
How is a screw tightened?
Into a threaded hole
35
How do you install a bolt or screw?
Install so if they are loose, they remain head upwards/in direction of rotation
36
How much thread should be showing?
0.8mm
37
Typical fasteners?
``` 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 ```
38
Most part numbers will break down into what?
``` Grip Length Diameter Drillings Finish ```
39
What does X stand for?
Steel
40
What does X in a triangle stand for?
Steel, close tolerance
41
What does a - stand for?
Corrosion resistant steel (CRS)
42
What does - and a triangle stand for?
CRS, close tolerance
43
What does - - stand for?
Aluminium
44
What does -triangle- stand for?
Aluminium alloy, close tolerance
45
What does U stand for in a code?
Unplated
46
What does - stand for in a code?
Plated
47
What does D stand for in a code?
Drilled shank
48
What does H stand for in a code?
Drilled head
49
What does the number after the letter mean in a code?
Grip length
50
Grip length of a bolt should equal what?
Thickness of material
51
Materials of more than 2.4mm have what?
Two threads inside hole
52
Materials less than 2.4mm have what?
No threads inside hole
53
What is the maximum number of washers used to overcome grip strength?
3
54
What is a standard stud?
Threaded all the way
55
What is a waisted stud?
Threaded on each end
56
What is a shouldered stud?
Threaded on each end and a ring in the middle
57
What is a stepped stud?
Threaded on each end, thicker at one end
58
What are studs classified by?
Diameter Length Thread type
59
Three types of stud fittings?
Stud box Stud insertion/removal tool Lock nuts
60
Methods of stud removal
Lock nuts Filed flats Ezi-outs
61
Properties of self-tapping screws
Thin gauge sheet metal parts Drilled holes Generates own thread Slotted and cruciform head types
62
What is a Shear Castle Nut?
Used same as castle but, but in areas that have lower tensile loads
63
What is a Castle Nut?
Used with drilled shanks and locked with a split pin
64
What is a slotted engine nut?
Designed to be put in high temperature areas
65
What is a wing nut?
Internal, finger tightened nut. Used for frequently opened areas
66
What is a plain nut?
Takes high tensile loads. Requires locking device
67
What is a check nut?
Used as a locking device for plain nuts
68
What is a lock nut?
Thin, plain nut. Tightened firmly onto main nut, wedges both onto threads. Friction lock
69
What is a Nyloc Stiffnut?
Unthreaded Nylon insert. Friction prevents loosening. Low temperature only
70
What is an Oddie stiffnut?
Six springey tongues, bent inwards, forms a circle less than diameter of root of bolt thread, grips bolt thread
71
What are Aerotight and Philidas?
Slotted locking extensions, misaligned threads, realigned by bolt thread, grips thread
72
What type of slit does Aerotight have?
Vertical slit
73
What type of slit does Philidas have?
Horizontal slit
74
What are Anchor nuts? Types?
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
What are High-temp self-locking nuts?
``` Used in 120C+ areas CRES, Steel alloy, silver plated CRES Friction locking Threads out of phase Pinched thread end section ```
76
What are Low-temp self-locking nuts?
``` 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
Two types of Heli-Coil Inserts?
``` Standard free running Screw lock (internal locking) ```
78
What are Heli-Coils manufactured from?
Round wire into diamond profile
79
How to install Heli-Coils?
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
How to remove Heli-coils?
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
Safetying methods
``` Wire locking Split pins Lock-washers Locking plates Snap-rings (circlips) Self-locking nuts ```
82
Two wire-locking methods?
Single - small screws, closed geometric pattern, electrical systems, hard to access areas Double - preferred, twist/inch 8-10 twists
83
Three types of washers?
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
Types of locking devices?
``` Pip-pin Camloc Dzus Airloc Split pin ```
85
What is a pit-pin?
Non threaded | Quick
86
What is Camloc?
``` Four principle parts: Receptacle Grommet Retaining ring Stud assembly ```
87
What is Dzus?
``` Two types: Light duty (access covers, etc) Heavy duty (cowlings, etc) ``` Spring Stud Grommet (heavy only)
88
What is Airloc?
Receptacle riveted to access panel frame Stud Cross pin Fixed and floating types
89
What is Split pin?
Materials: Low Carbon Stainless steel (CRES) Measured to shortest prong CRES non-magnetic areas (compasses) Good fit - not loose
90
What do keys do? Agreed standard taper?
Transmit drive from lock shaft to hub when mating surfaces are smooth. Used in parts that don’t require frequent separation 1:100
91
Four types of keys?
Hollow or flat saddle Gib-headed Feather Woodruff
92
What is a hollow/flat saddle?
Not suitable for heavy loads
93
What is a Gib-headed?
Sits on the end, locks everything in place
94
What is Feather?
When axial movement is required between hub and shaft
95
What is Woodruff?
Fits in like the letter D
96
Which rivets are used “as fabricated”? What are they used for?
1100 Aluminium Attach aluminium components where low strength is needed
97
Which three rivets are heat treated and used when medium strength is needed?
2017, 2117, 7050
98
Which rivets are supplied in -T4 condition, need heat treated, and are used when high strength is needed?
2024
99
What are Monel Rivets?
Without heat treatment before use, are used in steel, titanium, or aluminium alloy riveted assemblies
100
What are Titanium Rivets?
Rivets with a cylindrical or a partially tapered shank. No heat treatment
101
What must rivet shear strength match?
The bearing strength
102
Usually the rivet diameter is at least...
3x sheet thickness
103
Four types of rivets?
Snap head Universal Mushroom Countersunk (100 degrees is used)
104
What is 1100? Letter? Head marking?
Aluminium A No marking
105
What is 2017? Letter? Head marking?
Aluminium alloy D Raised dot
106
What is 2117? Letter? Head marking?
Aluminium alloy AD Small dimple
107
What is 2024? Letter? Head marking?
Aluminium alloy DD Two raised dashes
108
What is 5056? Letter? Head marking?
Aluminium alloy B Raised cross
109
Which aluminium alloys need heat treated?
``` 2024 DD 2017 D (?) ```
110
What letter is used for CRES? Head marking?
F No markings
111
What is sometimes used instead of CRES? Letter? Head marking?
Monel M Two dimples Raised “R”
112
What is the letter for Titanium? Head marking?
T Raised “V” Or raised “T”
113
What does M52040 AD - 5 - 12 mean?
20 - universal head AD - Material designation 2117 T4 5 - diameter in 32nds 12 - length in 16ths
114
What are Hi-lok fasteners? Tools?
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
On a Hi-lok, what do aluminium collars max at? CRES collars?
3 degrees 0.5 degrees
116
How to install Hi-loks?
Check grip length Pins and collars match Lubricate if required Install by hand or power
117
What are the collar colours? Oversizes?
Red - 1/64 Black - 3/64 Blue - 1/32 Chromium plate - varies
118
What are Hi-lites?
Very similar to hi-loks Less material 15% lighter than hi-lok Weight saving
119
What are Taper-loks?
Tapered bolt and self locking nut Used in high fatigue areas Good sealing effect Do not remove lubricant
120
What are Lockbolts?
``` Strong and light Two piece assembly - pin and collar Ensure collar face is correct way Wet-installed with sealant Do not remove lubricant ```
121
What are Cherrylock Blind rivets?
Three types: Standard Bulbed Oversize Body, pin, locking collar Do not remove lubricant
122
What are Cherrymax rivets?
Two types: Cherrymax Oversize cherrymax One piece Body, pin, collar Driving anvil detaches - protects tooling
123
How to measure grip length?
Put scale in hole Hook onto rear face of material Read thickness
124
What are Olympic-lok rivets?
Light Three piece mechanically locked Never file stem - weakens lock Only use Olympic tools
125
What are Rivnuts?
Rivet and nut combination | Creates a threaded location allowing screw fit in thin sheet metal

Materials And Hardware (11 decks)

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