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Kemble > M6.5pt2 Fasteners > Flashcards

M6.5pt2 Fasteners Flashcards

1
Q

What does a spring washer do?

A

Creates spring compression and a friction lock, cannot be reused

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2
Q

What does a tab washer do?

A

Has to be bent over the bolt, cannot reuse

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3
Q

What is a shake-proof washer?

A

Sharp edges of a washer dig into material of bolt, can only be reused if the springiness is retained

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4
Q

What is a lock wire and what does it do?

A

Single twists and double twists, can only lock a maximum of 3 bolts together, use of different thickness wire to lock in bolts

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5
Q

What are the 2 lock wiring methods?

A

. By hand
. Wire locking pliers (twisters)

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6
Q

What is a locking plate?

A

. Plate goes over a nut to prevent it loosening
. Reusable

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7
Q

What is a pal nut?

A

Spring lock action nut

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8
Q

How’s spring washers work

A

A small spring is inserted and causes it to friction lock preventing it to become undone

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9
Q

How is 1100 aluminium alloy identified

A

Plan head
the letter A
Low strength rivet, very soft

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10
Q

What is a quick release faster?

A

. Fast unlocking
. Vibration resistant

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11
Q

How do tab washers secure a nut

A

It’s put in between nut and surface and then the tabs are folded up

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12
Q

Which one of the washers are reusable

A

Shake proof

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13
Q

What’s locking wire made from

A

Stainless steel and copper

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14
Q

How is 2117 aluminium alloy identified

A

A dimple on the head
the letter AD
Medium strength rivet, most used
No heat treatment required (already done)

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15
Q

What’s the most common quick release fasteners

A

Dzus

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16
Q

What are the two types of Dzus and what’s the difference

A

Light and heavy ( heavy requires a grommet)

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17
Q

How is 5056 aluminium alloy identified

A

A cross
the letter B
5% magnesium, Al alloy
Prevent dissimilar metal corrosion
Rivet onto magnesium only

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18
Q

What is a taper pin?

A

. Any joint with shear load

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19
Q

Where would taper pins be used

A

In a place where a shear loading is applied

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20
Q

What is a split pin?

A

. Cadmium plated carbon or cress

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21
Q

What is the most common key?

A

Woedruff key

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22
Q

What are the 2 rivet codes and what do they mean?

A

426 - countersunk head
470 - universal head

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23
Q

In a rivet code what does the number before and after the dash mean?

A

Diameter 1/32 - Length 1/16

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24
Q

What’s the most common key

A

Woodruff key

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25
Q

What type of metal would have to be dimpled instead of countersunk?

A

Thin metal sheets

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26
Q

What type of nuts are split pins used with

A

Castlated nuts

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27
Q

What is a 426 rivet

A

A countersunk rivet

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28
Q

What’s a 470 rivet

A

Universal head

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29
Q

How is 2017 aluminium alloy identified

A

A raised dot
the letter D
Require heat treatment
Freezer delays age hardening
‘Ice box rivets’

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30
Q

How is 2024 aluminium alloy identified

A

Two dashes
the letters DD
Requires heat treatment
Ice box rivets

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31
Q

what do the numbers represent in rivet codes

A

The 3 digit code- is the head style (470 or 426)
The second to last one is the diameter of the rivet (measure in 1/32)
The last one is the length of the rivet (measure in 1/16)

32
Q

what do the numbers represent in rivet codes

A

The 3 digit code- is the head style (470 or 426)
The second to last one is the diameter of the rivet (measure in 1/32)
The last one is the length of the rivet (measure in 1/16)

33
Q

How is 7050 aluminium alloy identified

A

A raised circle
the letter E
Harder than 2024
Requires heat treatment

34
Q

Which type of rivet is most common universal or countersunk

A

Universal

35
Q

How is CRES aluminium alloy identified

A

no markings
the letter F
Used in firewalls and exhaust

36
Q

Why are counter rivets more commonly used on aircraft surface instead of universal

A

Because they’re more aerodynamic

37
Q

How is Monel aluminium alloy identified

A

2 : on head
the letter M
Instead of CRES rivets

38
Q

How are 1100 rivet aluminium alloys identified

A

By letter A
Have no marking

39
Q

What is difference between a special rivet to a standard rivet

A

Special rivets, you only have access to one end of the rivet.
More expensive

40
Q

How are 2117 identified

A

With letters AD
And a dimple in head of rivet

41
Q

How are 5056 rivets identified

A

With the letter B
And with a cross on the head of the rivet

42
Q

What are the 4 mechanical lock rivets

A

Huck lock
Cherry lock
Olympic lock
Cherry max

43
Q

How are 2017 rivets identified

A

Identified with the letter D
How a dot on the top

44
Q

How are 2024 aluminium rivets identified

A

With a DD
Has a double dash on rivet head

45
Q

What lock rivet replaces solid shank rivets

A

Huck lok

46
Q

How are CRES rivets identified

A

With the letter f

47
Q

What does a cherry lock ensure

A

The lock rinks endure stem is locked into place
Needs a specific tool

48
Q

What’s the economic advantage of cherry max rivets over cherry lock rivets

A

Cherry max only requires one size puller for installation of all sizes

49
Q

What’s the difference between a cherry lock and cherry max

A

Cherry max, any tool can be used for installation

50
Q

What is a disadvantage of Olympic lok

A

Needs specific installation tool

51
Q

What’s the difference between Hi lok and hi lite fasteners

A

Hi lite it’s lighter than hi lok

52
Q

What type of fastener is the strongest

A

Taper lok

53
Q

How can you identify different lock bolts

A

Colour coded

54
Q

What tools do you use for Hi loks

A

Allen key or hex drive

55
Q

Which is the strongest special fastener

A

Taper lok
Also radial compression over shank that evens out stress

56
Q

How would you remove special fasteners

A

Turning with wrench and pair of vice grips
Or
Mallet to tap out remaining faster
Or
Chisel to split collar

57
Q

Why is hite lite better than hi lok

A

15% lighter

58
Q

What is the angle for AN fitting

A

37%

59
Q

What is the angle for AC fittings

A

35%

60
Q

What colours would define an AC fitting

A

Yellow and grey is also shorter than AN

61
Q

What colours define AN fittings

A

Blue and black
Longer than AC

62
Q

What are the two types of flareless fittings

A

MS
Harrison

63
Q

What principle do MS and Harrison fittings follow

A

Ball bush principle

64
Q

What is the main advatanage of Harrison

A

Vibration resistant
Simple tooling

65
Q

How would you identify if a flareless fitting is made out of aluminium alloy

A

the letter D

66
Q

How would you identify if a flareless fitting is made out of cadmium plated steel

A

Non just plain

67
Q

How would you identify if a flareless fitting is made out of CRES

A

the letter S

68
Q

What is a swaged fitting used for

A

Repairing sleeve

69
Q

What are the advantages of swaged fittings

A

Quick
In situational

70
Q

What do flexible fluid lines do

A

Connect stationary to dynamic

71
Q

What does the inner layer of a flexible fluid line have to be

A

Chemically compatible (Teflon)
Compatible with nearly all fluid

72
Q

What are lay lines

A

Twist indicators
(1/16)
Prevent hose twisting

73
Q

What are the pressures for flexible fluid lines

A

Low - 600psi
Medium - up to 3000psi
High - above 3000psi

74
Q

What are the disadvantages of swaged end fittings

A

Cannot be removed or reused

75
Q

What are blanking caps used for

A

Covers end of fitting to prevent fod or cross contamination when changing

76
Q

When are quick disconnect couplings used

A

One hand operation to connect and disconnect without need for further equipment, very quick and easy

77
Q

What is a swivel fitting

A

Reduce length of hose between connections
Eliminate the need for bent tubing

Kemble (39 decks)

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