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MIL-DTL-18240 Fastener Element, Self-Locking, Threaded Fastener, 250 Degrees F MaximumThis specification defines the requirements for self-locking elements for use in externally threaded fasteners such as bolts and screws to be used in fasteners with either UNC, UNJC, UNF, UNJF, UNRC or UNRF threads and where the temperatures will not exceed 250 deg. F.

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MIL-DTL-18240F
TABLE III. Vibration requirements.
MIL-STD-1312/7 Vibration
Nut size
Bolt size
Bolts and nuts required
Seating
(min. of each)
Torque (in.-lb)
.190-32
AN3-15A
5
36
.250-28
AN4-16A
5
60
.312-24
AN5-16A
5
120
.375-24
AN6-17A
5
160
.437-20
AN7-17A
5
200
.500-20
AN8-20A
5
300
TABLE IV. Length and diameter of self-locking fasteners required
for qualification inspection.
Basic part no.
Length dash no.
Basic part no.
Length dash no.
NAS600
12P
AN8
20
NAS601
12P
AN9
21
NAS602
12P
AN10
21
AN3
15
AN12
21
AN4
16
AN14
23
AN5
16
AN17
24
AN6
17
AN18
25
AN7
17
AN20
27
16



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