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M6 > 6.5 > Flashcards

6.5 Flashcards

1
Q

Screws are the most commonly used fastener since they differ from bolts how?

A

They are made of lower strength materials

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2
Q

What fitting is screws and what are there head shapes made for

A

Loose fitting thread and the head is to engage a screwdriver or wrench

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3
Q

What are the following
Machine screws:
Structural screws:
Self-tapping screws:

A

Machine: most widely used
Structural: same strength as screws
Self-tapping: used to join light weight materials

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4
Q

What are machine screws used for?

A

Attaching fairings, inspection plates, fluid line clamps and structural parts.

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5
Q

What process are structural screws gone through to have similar characteristics to bolts?

A

Heat treated to have the same shear strength as a bolt.

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6
Q

What are the 4 types of self tapping screws?

A

Round
Truss
Counter sunk (flat top)
Counter sunk (oval)

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7
Q

What are dowels used for?

A

To align/correct two mating surfaces.

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8
Q

What is present in aircraft operation that can make parts loose?

And what can we use to stop the fasteners from coming loose?

A

Vibration is always present in aircraft.

To prevent use locks for the fasteners.

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9
Q

There’s are various methods to secure items in the aircraft industry what are some examples?

A

Safety wires
Split and cotter pins
Lock washers (tab, spring and shake proof)
Self locking nuts
Quick release fasteners

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10
Q

In places where self locking nuts and split pins can’t be used lock washers are used what are some examples?

A

Spring, tab and shake-proof

They are made of steel and twisted when the nut is against it which creates friction.

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11
Q

What is the counter sink angle from the head to the shank

A

100’ between the shank and head

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12
Q

What metal washer with two or more tabs where one is bent over the edge of a component or hole and the other against the nut

A

Tab washer

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13
Q

What washer bites into the nut to not allow it to uh tighten

A

Shakeproof washers

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14
Q

What is a pal nut?

A

Resilient spring locking action nut made of steel provide vibration proof action while small sized.

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15
Q

What plates are manufactured from mild steel used to secure parts (bolts securing it can be equipped with shake proof and spring washers)?

A

Locking plates secure making sure nothing comes loose can be re used

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16
Q

What fastener is held by a cross pin and a floating fastener?

A

Airloc

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17
Q

What fastener is quick release by a quarter turn and consist of a stud washer and receptacle

A

Camloc fasteners

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18
Q

What Simple’s secure fastener can be quickly inserted and removed with at tools?

A

Pip pin the pin with the button and ball bearing (thing that as remove before flight thing)

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19
Q

What pins provide a lock which is pushed into a Hole (place where not likely removed)?

A

Roll pins

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20
Q

What charteristics of Clevis pin

A

Goes in 1/16 inch incremets

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21
Q

What shaped piece of metal fits into ____ways in wheels discs sprockets or gears.

Aligns items and helps by spreading out load on what is being driven.

A

Keys

woodruff, square, pratt and Whitney, gib head key

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22
Q

What metal are rivets with no identifying marks and designated by letter A (in rivet code)

A

1100 Aluminium

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23
Q

What Rivets with code AD and a simple dimple also referred to as field rivets?

A

2117 Aluminium Alloy

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24
Q

What rivet has a raised cross and rivet code B

A

5056 Aluminium Alloy

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25
Q

What rivet has raised dot and rivet code D

A

2017 Aluminium alloy

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26
Q

What rivets identified by DD and two raised dashes

A

2024 aluminium alloy

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27
Q

What rivet has raised ring and letter E

A

7050-T73

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28
Q

What rivet is F

A

Corrosion resistant steel

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29
Q

What the diffrence between hi lite and hi lok bolt?

A

Hi lite is lighter and less threads

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30
Q

What are the 3 types of lock bolts

A

Pull type
Blind type
Stump type

31
Q

What materials are standard airfrane bolts made of?

A

Cadmium plated steel, corrosion resistsant steel and 2024 aluminuim alloy

32
Q

What load occurs for clevis bolts to be used?

A

Shear

33
Q

What featrues do a clecvis bolt have near its threads

A

A hole for pins

34
Q

What bolts are used in applications of external tension loads
And what is attached to them?

A

Eye bolts (used for the attachments of turnbuckles)

35
Q

What is special about the head of hex headed nickle steel bolts?

A

Holes drilled into them

36
Q

An173 and 186 are manufacturesd tk what tolerance?

A

+ or - 0.0005 inchs

37
Q

Ms20004 to ms20024 internal wrenching bolts sre high strength steel bolts where are they primarly used?

A

In areas subjected to high tensile loads (washers must be used under the head to provide needed bearing area)

38
Q

Nas bolts cant be replaced by AN 1/16 longer than AN
What are the dash numbers in nas even or odd

A

Even

39
Q

Where are all bolts but AN bolts measured from?

A

The grip length not overall

40
Q

What dash numbers do MS issue bolts have?
If grip length is too long or short odd dash bolts are available.

A

Even

41
Q

Use of circlips

A

Used for internal and external locking

42
Q

What is the term of the thread on a screw

A

The pitch (use a screw thread pitch gage)

43
Q

What are the 5 classes of fit

A

Class 1 loose
Class 2 free
Class 3 medium
Class 4 close
Class 5 Tight

44
Q

What is the diffrence of a theard on a external surface and formed inside a cylinder or cone

A

External is a male thread and cone is a internal/ female thread

45
Q

What is the diffrence between a thread on a cylinder or conical part?

A

Cylinder is straight or parallel thread
Conical part is taper thread

46
Q

Multiple threads are not often used but are found on what?

A

Industrial machines, vavles, fire hydrants and aircraft landing gear

47
Q

Screws and bolts have 4 types of lead threads what are the four?

A

Single one groove
Double two grooves
Triple three grooves
Quadruole four groves

48
Q

Double, triple and quadruple threads are known as what?

A

Multiple lead threads

49
Q

Where should a single thread be used?

A

Where locking power is required

50
Q

What advantages do multiple lead threads offer

A

They furnish more bearing surface
They have larger minor diameters
Provide rapid movement

51
Q

What is the lead?

A

The distance a nut travels in a revelution

52
Q

In a single lead screw how much does a nut move in one turn
And in a double lead how far?

A

Forward the pitch (one thread) in single lead
And double lead 2 threads in 1 rotaion etc

53
Q

What are the three most common standard thread forms

A

British standard thread forms
American nations thread forms
Unified thread forms

54
Q

What thread angle is british standard coarse (BSW)

A

55°

55
Q

BSF is a fine version always having 2.5cm turns than a bsw and offer greater resistance to?

A

Resitance to vibrations

56
Q

What is the BA (british assosiation) fine pitch sizes below?

A

6.35mm / 1/4 inch

57
Q

What is BA thread angle

A

47.5°

58
Q

What angle are anc and anf

A

60°

59
Q

United thread firms are univeral containing what 3 (what is UNC UNF and UNEF)

A

Unified National Coarse
Unified National Fine
Unified National Extra Fine

60
Q

Two screw threads may have similar major diamters but diffrent what?

A

Depths of thread

61
Q

If a screw has a deeper cut thread what will it have fewer of?

A

Fewer threads

62
Q

What are the 3 thread types

A

Square
Buttress
Acme

63
Q

What perk do square threads have

A

Very powerful root (handle heavy loads)

64
Q

What perk do buttress threads have?

A

Triangular section and have great pulling power

65
Q

What are the perks of acme threads

A

Tapered version of square easier to fix or unscrew when cutting nuts and considerbly stronger

66
Q

What is the crest a of screw?

A

Most prominent point of the thread

67
Q

What is the helix angle of a screw

A

Referes to areas of the screw angle in degrees

68
Q

What is the run out

A

Where minor diameter increases to major

69
Q

What are A and H bolts

A

A holes bolt heads
H for locking wire

70
Q

If a bolt is has no markings what should it be

A

Cadmium nickle plated

71
Q

What markings do close tolerance bolts have?

A

Triangular mark on the head

72
Q

Internal wrenching bolts are used in areas of what?

A

Areas subjected to high tensile loads

73
Q

What is the thread?

A

The angle between two adjacent flanks

M6 (5 decks)

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