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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
Q

When gauging nuts or internal threads? What gauge is used?

A

A full form go plug gauge is used

26
Q

Information on the identification of bolts, screws and nuts of British manufacture are found where?

A

Book 1 chapter e leaflet e30

27
Q

Hexagon headed bolts of 1/4 inch diameter and over are stamped with a?

A

2 digit British standard number EG a25

28
Q

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.

A

A25 - BRITISH STANDARD NUMBER

32= 3.2 inches

L ~ indicates that the thread diameter is 7/16 of an inch

29
Q

Shear bolts are made from
High tensile steel and have what type ode heads?

A

Thin heads

30
Q

Cold forged bolts have what type of head?

A

An EMBOSSED RING ON THE HEAD

31
Q

What does G indicate?

A

5/16 in BSF

32
Q

What does W indicate?

A

1 inch in bsf

33
Q

Define A57 31J

A

A57 - British standard number

31 - 3.1 inches

J is 3/8ths thread diameter

34
Q

SCREWS NOW

Identification of screws consist of?

A

The BS number

Letter indicating the thread diameter

Then part number in 32nds of an inch

35
Q

For example

Define a41 C 16

A

A41 British standard number

C = 2ba thread diameter

16 = 16/32 = 1/2 inch

36
Q

Cheese and round head screws. Where is the nominal length obtained?

A

From the underside of the head to the extreme end of the shank

37
Q

How is the nominal length of a countersunk head obtained?

A

the distance measured from the upper surface of the head to the extreme end of the shank

38
Q

All bolts from A102 to A212 have a nominal length of

A

All have unified threads

Inch

39
Q

The ‘unified’ marking consists off?

A

3 contiguous circles, a recessed head or shank dog point

40
Q

Shear nuts are how thick in inches?

A

0 - 2 inch thick

41
Q

The code system for identifying nuts is

A

THE BS NUMBER

A LETTER INDICATING THE SIZE OF THREAD

A LETTER INDICATING TYPE OF NUT

42
Q

Define P S C T as types of nuts

A

P - ORDINARY NUT

S - SLOTTED NUT

C - CASTLE NUT

T - THIN NUT

THEY REPRESENT WITH WHAT THEY START WITH

43
Q

THE THREE STANDARDS MOST GENERALLY USED IN AIRCRAFT CONSTRUCTION

A

AN - AIRFORCE NAVY STANDARDS

NAS - NATIONAL AEROSPACE STANDARDS

MS - MILITARY STANDARDS

44
Q

THE AN NUMBER IS USED TO IDENTIFY WHAT?

A

The type of bolt and its diameter

45
Q

What does a triangle on top of a hex head translate to?

A

Close tolerance

46
Q

What does a x inside a triangle in a hex head translate to?

A

Steel, close tolerance bolt

47
Q

A triangle with 2 dashes either side translates to?

A

Aluminum alloy close tolerance

48
Q

STEEL SCREWS ARE MARKED WITH WHAT?

A

AN X

49
Q

NUTS INTENDED FOR USE WITH ‘AN’ BOLTS HAVE

A

The same code as the bolts

50
Q

Screws are provided in MS specifications. It is found

A

Cap 562 book 1 e40

51
Q

The threads on NATIONAL AEROSPACE STANDARDS are usually?

A

UNC UNF UNJC UNJF

52
Q

V INDICATES?

C INDICATES?

A

V INDICATED TITIANUM

C INDICATES CORROSION RESISTANT STEEL

53
Q

Self tapping screws are used to?

A

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
Q

TYPE A SELF TAPPING SCREWS HAVE?

A

TYPE A = SHARP POINT

55
Q

TYPE B HAS?

A

BLUNT POINT

56
Q

Sheet metal nuts (anchor nuts) may be known as

A

Speed nuts or tinnerman nuts

57
Q

The arched prongs make contact with the threads of the screw. As the screw is tightened? The prongs

A

Move inward to engage and lock the screw

Part 1 Materials (4 decks)

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