MIL-DTL-18240F
TABLE VA. Dimensions of nuts required for qualification and conformance tests (inches) 1/ 2/ 3/ 4/ 5/
UNF, UNJF, UNC, UNJC THREAD FORMS
Minor Dia.
Thread size
Minimum width
Nut
90-degree
across flats
thickness
csink dia
+/-.010
+/-.010
Min
Max
.112-48
.240
.165
.132
.0929
.0957
.112-40
.240
.200
.132
.0894
.0922
.138-40
.302
.200
.168
.1148
.1176
.138-32
.302
.250
.168
.1094
.1122
.164-36
.334
.250
.194
.1379
.1407
.164-32
.334
.250
.194
.1348
.1377
.190-32
.365
.250
.220
.1605
.1633
.190-24
.365
.335
.220
.1511
.1539
.250-28
.427
.285
.281
.2157
.2185
.250-20
.427
.400
.281
.2026
.2054
.312-24
.490
.335
.344
.2722
.2751
.312-18
.490
.445
.344
.2593
.2621
.375-24
.552
.335
.406
.3344
.3372
.375-16
.552
.500
.406
.3148
.3176
.437-20
.678
.400
.468
.3888
.3916
.437-14
.678
.570
.468
.3685
.3713
Notes: 1/ Material: 300 series stainless steel.
2/ The nut minor diameter finish shall be 63 MI or better.
3/ Nut thread dimensions not listed in table VA shall conform to MIL-S-8879 for class 3B threads Threads
shall be cut not formed.
4/ For thread sizes above .437 diameter see table VB.
5/ Test nuts manufactured to MIL-F-18240 Revision E may be used until 1 year from the date of
this specification. The test nuts specified in Revision E must be used in accordance with the
requirements of Revision E.
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