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kemble > M6.5 Fastners > Flashcards

M6.5 Fastners Flashcards

1
Q

How can you measure the screw pitch

A

By using a screw thread pitch gauge

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2
Q

What does class 1 mean

A

Loose fit

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3
Q

What does class 2 mean

A

Free fit

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4
Q

What does class 3 mean

A

Medium fit

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5
Q

What does class 4 mean

A

Close fit

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6
Q

What does class 5 mean

A

Tight fit

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7
Q

Whose mum is class 1 fit

A

Lewis’s mum cus she’s a loose fit

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8
Q

What class are aircraft screws normally in

A

Class 2

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9
Q

What is the maximum temperature low temperature locking nuts can withstand?

A

121 degrees

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10
Q

What is the crest on a screw

A

The prominent point of the thread

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11
Q

What is the temperature high temperature self locking nuts will act at?

A

121 degrees plus

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12
Q

What is the root of a screw

A

Bottom point of the thread groove

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13
Q

Where are slotted engine nuts used?

A

Engine only

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14
Q

What is a flank on a screw

A

The angle of the slope between the root and crest

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15
Q

What are anchor nuts used for?

A

Pannels regularly removed

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16
Q

Where are tinerman nuts used?

A

Any area which chance of magnetic interference

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17
Q

What is a stud (don’t say megs dad)

A

Shaft threaded on both ends

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18
Q

What is a thread angle

A

Angle between two crests

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19
Q

Describe a standard stud thread

A

Same throughout

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20
Q

Describe a waisted stud thread

A

Threaded each end, strength is retained, weight saved

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21
Q

What is the major diameter (screws) on a male and female

A

Crest to crest on male
Root to root female

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22
Q

Describe a stepped studs thread

A

Provide a stronger anchorage when used for softer material

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23
Q

Describe a shouldered stud thread

A

used when rigidity is required lateral stress

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24
Q

What are the 3 ways stud insertion are removed?

A

. Stud box
. Stud insertion tool
. Lock nuts

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25
Q

What is a heat coil insert and what does it do?

A

. Repairs stripped thread
. Must be 1/2 pitch below surface

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26
Q

What is a minor diameter (screws) on male and female

A

Root to root on male
Crest to crest on female

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27
Q

Name the 3 types of screw and describe them

A

. Machine screws - most common, structural parts, fairings
. Structural screws - same bolt strength, can be heat treated
. Self tapping screws - light weight material only, thin metal sheets

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28
Q

What is a pitch (screw)

A

The distance of one revolution

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29
Q

What are dowels?

A

Provide precision to alignment

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30
Q

What does BSW

A

British standard Whitworth

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31
Q

What does BSF stand for

A

British standard fine

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32
Q

What does BSP stand for

A

British standard pipe

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33
Q

What are the thread angles of BSW, BSF, BSP

A

55^

34
Q

When would you use BSF

A

When part is subject to vibration

35
Q

What does BA stand for

A

British association

36
Q

What is the Thread angle of BA and the diameter

A

47.5^
Less than 1/4” diameter

37
Q

What does ANC and ANF stand for

A

American national coarse - flat crest and root
American national fine

38
Q

What the “x” indicate on top of a bolt

A

That it’s a steel bolt

39
Q

What thread angle is ANC and ANF

A

60^

40
Q

What type of thread profile only travels in one direction

A

Buttress

41
Q

What is the thread angle for United national coarse, fine and extra fine

A

60^

42
Q

What are the three bolt profiles

A

Acme
Buttress
Square

43
Q

What are the two types of threads

A

Course and fine

44
Q

What the thread angle of a unified National threads?

A

60 degrees

45
Q

What’s the thread angle of American thread forms

A

60 degrees

46
Q

Which one out the British thread forms has a different thread angle and what is that angle

A

Ba and 47.5

47
Q

What’s the thread angle of British thread forms

A

55 degrees

48
Q

What’s the major and minor diameter of a female thread

A

Minor- crest to crest
Major- root to root

49
Q

What’s the major and minor diameters of a male thread

A

Major- crest to crest
Minor- root to root

50
Q

What is a square thread profile used for

A

Ideal for power transmission

51
Q

What’s the crest, root and flank of screw

A

Crest is the prominent point
Root is the lowest point
Flank is the angle of the slope

52
Q

What do the 5 classes mean

A

1 is loose
2 is free
3 is medium
4 is close
5 is tight

53
Q

What’s used to measure a thread pitch

A

Thread pitch gauge

54
Q

What is an advantage of ACME thread profile

A

Stronger than square

55
Q

What is Butress thread profile used for

A

For handling heavy forces, can only travel in one direction

56
Q

What are close tolerance bolts used for

A

When subjected to pounding loads

57
Q

When are eyebolts used

A

When subjected to tension loads

58
Q

What does H mean on a Bolt

A

A Drilled head

59
Q

When are Clovis bolts used

A

When subjected to shear loads

60
Q

What does the double dash on a bolt head mean

A

That it’s made from aluminium

61
Q

What’s the triangle on a bolt head mean

A

That it’s close tolerance

62
Q

What’s a single dash mean on a bolt head mean

A

That it’s made from CRES metal (corrosion resistant)

63
Q

What are the two different types of nuts

A

Self locking
Non self locking

64
Q

What does the cross mean in material identification?

A

Steel

65
Q

What does a line in the bottom left corner mean in material identification?

A

Corrosion resistant steel

66
Q

What does two lines mean in material identification?

A

Aluminium

67
Q

what temp do low temperature self locking nuts operate at

A

121 degrees max

68
Q

What does A mean when on a bolt

A

Drilled hole need to check

69
Q

What does it mean if there’s a triangle when identifying materials?

A

Close tolerance

70
Q

What is a Clevis bolt and when is it used

A

Round snapped head
Only used when load applied is shear

71
Q

What’s the difference between the materials in a low temp self locking nuts vs a high temp self locking nut

A

Nylon insert in low temp
High temps made from same metal

72
Q

When is an eye bolt used

A

Where external load tension applied

73
Q

What is a drilled head engine bolt and when is it used

A

Have a thick head that has small holes in each of the flats and centre of the head
Only used in engine

74
Q

What’s the difference between a slotted engine nut and a castle nut

A

Slotted engine nuts can only be used on engine whereas castle nuts can be used on structure

75
Q

What is a close tolerance bolts and when are they used

A

Used in areas subject to pounding or where load is required to be riveted and bolted
Identified by triangle mark on their heads

76
Q

What’s the reason for using waisted studs

A

Used for when weight saving is needed

77
Q

What’s the reason for using shouldered studs

A

Gives lateral stability

78
Q

When is an internal wrench bolt used

A

High tensile steel bolts
Used for high tensile strength
Spreads stress out

79
Q

What is precision airframe bolts and when is it used

A

Grap length = 1/16 inch increments
Used if standard ms bolt is either too long or too short

80
Q

Why are hell coil inserts used

A

Used when the thread has worn away to replace previous threads

kemble (39 decks)

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