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Part 1 Materials > Book 3 Fasteners > Flashcards

Book 3 Fasteners Flashcards

1
Q

What is the standard countersink angle?

A

100 degrees

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2
Q

Fasteners holding parts together are subject to 2 types of loads.

Loads along the length of the fastener are called?

Loads across the fastener are called?

A

Tension loads

Shear loads

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3
Q

What is the grip length of a countersunk bolt?

A

From the top of the head to the end of the plane shank

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4
Q

Fine threads are capable of giving what?

A

Greater locking effects than course ones.

A fine thread will also be less likely to vibrate loose compared to a course thread

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5
Q

What is the pitch of the thread?

A

The pitch of a thread is the distance from a point on one thread to the corresponding point on the next

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6
Q

What is the crest of a thread?

A

The crest is the peak of the thread

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7
Q

What is the root of a thread

A

Root is inbetween the threads

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8
Q

What is the flank of a thread

A

The part of the thread that is angled downwards

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9
Q

What is the thread angle for all threads

A

BRITISH STANDARD (BSF) (BSW) (BSP)- 55 degrees

BRITISH ASSOCIATION- 47.5 degrees

AMERICAN 60 degrees

UNIFIED 60 degrees

METRIC 60 degrees

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10
Q

What is the lead on a thread?

A

LEAD IS THE DISTANCE TRAVELED AXIALLY.

HOW FAR IT TURNS THROUGH ONE TURN

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11
Q

What are left hand threads used for?

A

Locknuts or turn buckles

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12
Q

BRITISH STANDARD WHITWORTH (BSW) has what type of thread?

A

Thread angle of 55 degrees and is course threaded with both the crest and root radiused.

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13
Q

BRITISH STANDARD FINE (BSF) when used in aircraft fasteners what size is the smallest?

A

1/4 of an inch

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14
Q

BRITISH ASSOCIATION (BA) has a very fine thread angle of?

A

47.5 degrees and the root and crest is radiused

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15
Q

AMERICAN NATIONAL COARSE (ANC) and AMERICAN NATIONAL FINE (ANF) both have?

A

V THREADS WITH AN ANGLE OF 60 degrees. The root and crest of the thread are flattened

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16
Q

UNIFIED HAS A THREAD ANGLE OF

A

60 degrees

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17
Q

The unified threads used in the aerospace industry are UNC OR UNF ARE MANUFACTURED IN ONE CLASS OF FIT WHICH IS

A

Class 2

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18
Q

Metric screw threads have an angle of?

A

60 degrees

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19
Q

MJ STANDS FOR WHAT?

A

M - METRIC
J - THREAD

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20
Q

MJ X 1 -3

A

METRIC THREAD

1= pitch size

-3 = class 3 fit

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21
Q

What is a class 2 fit?

A

This class applies to most of the fasteners used in aerospace

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22
Q

What is a class 3 fit?

A

Applies to threads which have a snug fit. Used in ENGINE APPLICATIONS

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23
Q

A GO NO GO SCREW PLUG GAUGE MEASURES WHAT?

A

Makes sure that the internal thread is correct

24
Q

A GO NO GO RING SCREW GAUGE MEASURES WHAT?

A

Checks if external threads are correct

25
When gauging nuts or internal threads? What gauge is used?
A full form go plug gauge is used
26
Information on the identification of bolts, screws and nuts of British manufacture are found where?
Book 1 chapter e leaflet e30
27
Hexagon headed bolts of 1/4 inch diameter and over are stamped with a?
2 digit British standard number EG a25
28
BOLTS OF 7/16 inch diameter and over are stamped with a part number in addition to the BS number eg A25 32L. Define the number.
A25 - BRITISH STANDARD NUMBER 32= 3.2 inches L ~ indicates that the thread diameter is 7/16 of an inch
29
Shear bolts are made from High tensile steel and have what type ode heads?
Thin heads
30
Cold forged bolts have what type of head?
An EMBOSSED RING ON THE HEAD
31
What does G indicate?
5/16 in BSF
32
What does W indicate?
1 inch in bsf
33
Define A57 31J
A57 - British standard number 31 - 3.1 inches J is 3/8ths thread diameter
34
SCREWS NOW Identification of screws consist of?
The BS number Letter indicating the thread diameter Then part number in 32nds of an inch
35
For example Define a41 C 16
A41 British standard number C = 2ba thread diameter 16 = 16/32 = 1/2 inch
36
Cheese and round head screws. Where is the nominal length obtained?
From the underside of the head to the extreme end of the shank
37
How is the nominal length of a countersunk head obtained?
the distance measured from the upper surface of the head to the extreme end of the shank
38
All bolts from A102 to A212 have a nominal length of
All have unified threads Inch
39
The ‘unified’ marking consists off?
3 contiguous circles, a recessed head or shank dog point
40
Shear nuts are how thick in inches?
0 - 2 inch thick
41
The code system for identifying nuts is
THE BS NUMBER A LETTER INDICATING THE SIZE OF THREAD A LETTER INDICATING TYPE OF NUT
42
Define P S C T as types of nuts
P - ORDINARY NUT S - SLOTTED NUT C - CASTLE NUT T - THIN NUT THEY REPRESENT WITH WHAT THEY START WITH
43
THE THREE STANDARDS MOST GENERALLY USED IN AIRCRAFT CONSTRUCTION
AN - AIRFORCE NAVY STANDARDS NAS - NATIONAL AEROSPACE STANDARDS MS - MILITARY STANDARDS
44
THE AN NUMBER IS USED TO IDENTIFY WHAT?
The type of bolt and its diameter
45
What does a triangle on top of a hex head translate to?
Close tolerance
46
What does a x inside a triangle in a hex head translate to?
Steel, close tolerance bolt
47
A triangle with 2 dashes either side translates to?
Aluminum alloy close tolerance
48
STEEL SCREWS ARE MARKED WITH WHAT?
AN X
49
NUTS INTENDED FOR USE WITH ‘AN’ BOLTS HAVE
The same code as the bolts
50
Screws are provided in MS specifications. It is found
Cap 562 book 1 e40
51
The threads on NATIONAL AEROSPACE STANDARDS are usually?
UNC UNF UNJC UNJF
52
V INDICATES? C INDICATES?
V INDICATED TITIANUM C INDICATES CORROSION RESISTANT STEEL
53
Self tapping screws are used to?
Secure components to thin gauge metal sheet. As It may not be possible to use nuts and bolts The sheet metal may be to thin to tap
54
TYPE A SELF TAPPING SCREWS HAVE?
TYPE A = SHARP POINT
55
TYPE B HAS?
BLUNT POINT
56
Sheet metal nuts (anchor nuts) may be known as
Speed nuts or tinnerman nuts
57
The arched prongs make contact with the threads of the screw. As the screw is tightened? The prongs
Move inward to engage and lock the screw

Part 1 Materials (4 decks)

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