MIL-DTL-18240F
TABLE VB. Dimensions of nuts required for qualification and conformance tests (inches) 1/ 2/ 3/ 4/ 5/
Thread size
Minimum
Nut
90-degree
Thread
Minor Dia
Form
width
thickness
csink dia
across flats
+/-.010
+/-.010
Min
Max
.500-20
.740
.400
.531
UNF
.4484
.4514
UNJF
.4537
.4567
.500-13
.740
.615
.531
UNC
.4212
.4242
UNJC
.4295
.4325
.562-18
.865
.445
.593
UNF
.5048
.5078
UNJF
.5110
.5140
.562-12
.865
.665
.593
UNC
.4767
.4797
UNJC
.4849
.4879
.625-18
.927
.445
.656
UNF
.5675
.5705
UNJF
.5734
.5764
.625-11
.927
.727
.656
UNC
.5316
.5346
UNJC
.5405
.5434
.750-16
1.052
.625
.781
UNF
.6844
.6884
UNJF
.6915
.6955
.750-10
1.052
.800
.781
UNC
.6463
.6503
UNJC
.6566
.6606
.875-14
1.240
.655
.906
UNF
.8004
.8044
UNJF
.8084
.8124
.875-9
1.240
.890
.906
UNC
.7596
.7636
UNJC
.7715
.7755
1-12
1.427
.750
1.031
UNF
.9124
.9174
UNJF
.9219
.9269
1-8
1.427
1.000
1.031
UNC
.8699
.8749
UNJC
.8833
.8883
1.125-12
1.615
.812
1.156
UNF
1.0374
1.0424
UNJF
1.0464
1.0514
1.250-12
1.812
.875
1.281
UNF
1.1624
1.1674
UNJF
1.1714
1.1764
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 VB shall conform to MIL-S-8879 for class 3Bthreads. Threads
shall be cut not formed.
4/ For thread sizes less than .500 diameter see table VA.
6/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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