Fasteners Flashcards
NC
American National Course
NF
American National Fine
UNC
American Standard Unified Course
UNF
American Standard Unified Fine
5 classes of fit
Class 1: loose Class 2: free Class 3: medium Class 4: close Class 5: tight
standard bolt designation codes
AN3 to AN20
standard bolt measurements
length - 1/16”
diameter - 1/8”
*no - 8, - 9, only - 7 to - 10, - 17 to - 20, - 27 to - 30
material types:
- C
- DD
- C = corrosion resistant
- DD = aluminum alloy
AN73 to AN81
drilled head engine bolt
MS20073
MS20074
MS20073 - fine thread drilled engine bolt
MS20074 - course thread drilled engine bolt
*diameter indicated by dash number, length by chart number
AN173 to AN186
close tolerance bolts
drilled head engine bolt course and fine thread ID
no ID = fine thread
A - course thread
what areas do you use close tolerance bolts?
areas subject to pounding loads or that are riveted and bolted
are close tolerance bolts cadmium plated?
no, apply grease before installation
AN21 to AN36
clevis bolts
what are the measurements of clevis bolts?
diameter = 1/16th length = 1/16th
MS20004 to MS20024
internal wrenching bolts
what are internal wrenching bolts used for?
high tensile loads
when is an MS20002C washer used?
with internal wrenching bolts when installed in an aluminum alloy structure
can you swap an internal wrenching bolt for a standard bolt?
no, internal wrenching bolts are higher strength, so standard bolts cannot be used in their place
AN310
castle nut (shear or tensile load)
AN320
shear castle nut
AN315
plain nut (RH and LH threads, no locking provisions)
AN316
check nut (second nut tightened against primary nut)
AN340
machine screw nut (course threads, B = brass)
AN345
machine screw nut (fine threads)
AN355
slotted engine nut (engine use ONLY)
AN360
plain engine nut (engine use ONLY)
AN350
wing nut
AN365
self locking nylon nut (do not use in areas exceeding 250F/120C)
AN363
metal self locking nut
AN364
metal self locking nut (shear)
what are the three classifications of screws?
machine screws, structural screws, self-tapping screws
AN385
taper pin (forced into hole, held by friction)
AN386
taper pin (small end is threaded)
AN960
plain washer (three thicknesses, LL=thinnest, L=thin, no ID=thick)
AN970
penny washer
AN935
split lock washer (twisted)
AN936
shakeproof lock washer
MS20002C
countersunk washer
heli-coil insert
stainless steel helix with diamond cross section, must be approved by component manufacturer or FAA
acres sleeve
used if hole is worn oversize or there is uncleanable corrosion
where do you use non-flexible cable?
areas where linkage does not pass over any pulleys (1x7 or 1x19 configuration)
what is the cable configuration of flexible cable?
7x7 (seven strands of seven wires) in 1/16 and 3/32 sizes
what is the cable configuration of extra flexible cable?
7x19 (133 wires in seven strands)
how do you test is cables were properly swaged?
use a go/no-go gauge
what is the order of squeezing a Nicopress sleeve?
middle, end nearest thimble, end nearest free cable
