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Aircraft Hardware > Fasteners > Flashcards

Fasteners Flashcards

1
Q

NC

A

American National Course

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2
Q

NF

A

American National Fine

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3
Q

UNC

A

American Standard Unified Course

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4
Q

UNF

A

American Standard Unified Fine

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5
Q

5 classes of fit

A 
Class 1: loose
Class 2: free
Class 3: medium
Class 4: close
Class 5: tight
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6
Q

standard bolt designation codes

A

AN3 to AN20

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7
Q

standard bolt measurements

A

length - 1/16”
diameter - 1/8”
*no - 8, - 9, only - 7 to - 10, - 17 to - 20, - 27 to - 30

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8
Q

material types:

  • C
  • DD
A
  • C = corrosion resistant

- DD = aluminum alloy

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9
Q

AN73 to AN81

A

drilled head engine bolt

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10
Q

MS20073

MS20074

A

MS20073 - fine thread drilled engine bolt
MS20074 - course thread drilled engine bolt

*diameter indicated by dash number, length by chart number

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11
Q

AN173 to AN186

A

close tolerance bolts

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12
Q

drilled head engine bolt course and fine thread ID

A

no ID = fine thread

A - course thread

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13
Q

what areas do you use close tolerance bolts?

A

areas subject to pounding loads or that are riveted and bolted

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14
Q

are close tolerance bolts cadmium plated?

A

no, apply grease before installation

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15
Q

AN21 to AN36

A

clevis bolts

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16
Q

what are the measurements of clevis bolts?

A 
diameter = 1/16th
length = 1/16th
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17
Q

MS20004 to MS20024

A

internal wrenching bolts

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18
Q

what are internal wrenching bolts used for?

A

high tensile loads

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19
Q

when is an MS20002C washer used?

A

with internal wrenching bolts when installed in an aluminum alloy structure

20
Q

can you swap an internal wrenching bolt for a standard bolt?

A

no, internal wrenching bolts are higher strength, so standard bolts cannot be used in their place

21
Q

AN310

A

castle nut (shear or tensile load)

22
Q

AN320

A

shear castle nut

23
Q

AN315

A

plain nut (RH and LH threads, no locking provisions)

24
Q

AN316

A

check nut (second nut tightened against primary nut)

25
Q

AN340

A

machine screw nut (course threads, B = brass)

26
Q

AN345

A

machine screw nut (fine threads)

27
Q

AN355

A

slotted engine nut (engine use ONLY)

28
Q

AN360

A

plain engine nut (engine use ONLY)

29
Q

AN350

A

wing nut

30
Q

AN365

A

self locking nylon nut (do not use in areas exceeding 250F/120C)

31
Q

AN363

A

metal self locking nut

32
Q

AN364

A

metal self locking nut (shear)

33
Q

what are the three classifications of screws?

A

machine screws, structural screws, self-tapping screws

34
Q

AN385

A

taper pin (forced into hole, held by friction)

35
Q

AN386

A

taper pin (small end is threaded)

36
Q

AN960

A

plain washer (three thicknesses, LL=thinnest, L=thin, no ID=thick)

37
Q

AN970

A

penny washer

38
Q

AN935

A

split lock washer (twisted)

39
Q

AN936

A

shakeproof lock washer

40
Q

MS20002C

A

countersunk washer

41
Q

heli-coil insert

A

stainless steel helix with diamond cross section, must be approved by component manufacturer or FAA

42
Q

acres sleeve

A

used if hole is worn oversize or there is uncleanable corrosion

43
Q

where do you use non-flexible cable?

A

areas where linkage does not pass over any pulleys (1x7 or 1x19 configuration)

44
Q

what is the cable configuration of flexible cable?

A

7x7 (seven strands of seven wires) in 1/16 and 3/32 sizes

45
Q

what is the cable configuration of extra flexible cable?

A

7x19 (133 wires in seven strands)

46
Q

how do you test is cables were properly swaged?

A

use a go/no-go gauge

47
Q

what is the order of squeezing a Nicopress sleeve?

A

middle, end nearest thimble, end nearest free cable

Aircraft Hardware (1 decks)

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