Fasteners

Question 1

NC

Answer 1

American National Course

Question 2

NF

Answer 2

American National Fine

Question 3

UNC

Answer 3

American Standard Unified Course

Question 4

UNF

Answer 4

American Standard Unified Fine

Question 5

5 classes of fit

Answer 5

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

Question 6

standard bolt designation codes

Answer 6

AN3 to AN20

Question 7

standard bolt measurements

Answer 7

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

Question 8

material types:

• C
• DD

Answer 8

• C = corrosion resistant

- DD = aluminum alloy

Question 9

AN73 to AN81

Answer 9

drilled head engine bolt

Question 10

MS20073

MS20074

Answer 10

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

*diameter indicated by dash number, length by chart number

Question 11

AN173 to AN186

Answer 11

close tolerance bolts

Question 12

drilled head engine bolt course and fine thread ID

Answer 12

no ID = fine thread

A - course thread

Question 13

what areas do you use close tolerance bolts?

Answer 13

areas subject to pounding loads or that are riveted and bolted

Question 14

are close tolerance bolts cadmium plated?

Answer 14

no, apply grease before installation

Question 15

AN21 to AN36

Answer 15

clevis bolts

Question 16

what are the measurements of clevis bolts?

Answer 16

diameter = 1/16th
length = 1/16th

Question 17

MS20004 to MS20024

Answer 17

internal wrenching bolts

Question 18

what are internal wrenching bolts used for?

Answer 18

high tensile loads

Question 19

when is an MS20002C washer used?

Answer 19

with internal wrenching bolts when installed in an aluminum alloy structure

Question 20

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

Answer 20

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

Question 21

AN310

Answer 21

castle nut (shear or tensile load)

Question 22

AN320

Answer 22

shear castle nut

Question 23

AN315

Answer 23

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

Question 24

AN316

Answer 24

check nut (second nut tightened against primary nut)

Question 25

AN340

Answer 25

machine screw nut (course threads, B = brass)

Question 26

AN345

Answer 26

machine screw nut (fine threads)

Question 27

AN355

Answer 27

slotted engine nut (engine use ONLY)

Question 28

AN360

Answer 28

plain engine nut (engine use ONLY)

Question 29

AN350

Answer 29

wing nut

Question 30

AN365

Answer 30

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

Question 31

AN363

Answer 31

metal self locking nut

Question 32

AN364

Answer 32

metal self locking nut (shear)

Question 33

what are the three classifications of screws?

Answer 33

machine screws, structural screws, self-tapping screws

Question 34

AN385

Answer 34

taper pin (forced into hole, held by friction)

Question 35

AN386

Answer 35

taper pin (small end is threaded)

Question 36

AN960

Answer 36

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

Question 37

AN970

Answer 37

penny washer

Question 38

AN935

Answer 38

split lock washer (twisted)

Question 39

AN936

Answer 39

shakeproof lock washer

Question 40

MS20002C

Answer 40

countersunk washer

Question 41

heli-coil insert

Answer 41

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

Question 42

acres sleeve

Answer 42

used if hole is worn oversize or there is uncleanable corrosion

Question 43

where do you use non-flexible cable?

Answer 43

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

Question 44

what is the cable configuration of flexible cable?

Answer 44

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

Question 45

what is the cable configuration of extra flexible cable?

Answer 45

7x19 (133 wires in seven strands)

Question 46

how do you test is cables were properly swaged?

Answer 46

use a go/no-go gauge

Question 47

what is the order of squeezing a Nicopress sleeve?

Answer 47

middle, end nearest thimble, end nearest free cable