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MIL-DTL-1222 Studs, Bolts, Screws And Nuts For Applications Where A High Degree Of Reliability Is Required; General Specification ForThis specification covers standard studs, hex cap screws, and heavy hex bolts in nominal standard diameters of 1/4 inch to 4 inches, nuts in nominal standard diameters of 1/4 inch to 3 inches, and socket head cap screws in nominal standard diameters of 1/4 inch to 1 1/2 inches for submarine safety and other applications where a high degree of reliability is required \(see 6.1\).

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TABLE VI.
Body diameter - studs, type I, II, III.
A
Body diameter (inches)(A)
Full Body
Reduced Body
Constant strength body
Rolled thread
1
Type I
Type I
Type
II
Type
II
Cut thread
Styles a, b,
Nut
c, d
Styles a & c
Styles b & d
Styles
a&c
Styles
b&d
Styles b & d
end
Size
thread
Max
Min
Max
Min
Max
Min
Max
Min
Max
Min
Max
Min
¼
0.270
0.241
0.270
0.240
0.250
0.214
0.248
0.212
0.205
0.201
0.220
0.212
UNC
5
/6
0.332
0.303
0.332
0.302
0.312
0.273
0.311
0.271
0.262
0.258
0.278
0.271
UNC
1
3
/
0.395
0.365
0.395
0.364
0.375
0.331
0.373
0.328
0.318
0.314
0.336
0.328
UNC
8
7
/6
0.457
0.427
0.457
0.425
0.437
0.387
0.436
0.385
0.373
0.368
0.393
0.385
UNC
1
½
0.520
0.489
0.520
0.487
0.500
0.446
0.498
0.443
0.430
0.425
0.452
0.443
UNC
9
/6
0.582
0.551
0.582
0.549
0.562
0.504
0.560
0.501
0.487
0.481
0.510
0.501
UNC
1
5
/
0.645
0.612
0.645
0.611
0.625
0.561
0.623
0.558
0.542
0.536
0.568
0.558
UNC
8
¾
0.770
0.737
0.770
0.735
0.750
0.680
0.748
0.677
0.658
0.652
0.687
0.677
UNC
7
/
0.895
0.861
0.895
0.859
0.875
0.798
0.873
0.794
0.773
0.767
0.804
0.794
UNC
8
1
1.020
0.985
1.020
0.983
1.000
0.913
0.998
0.910
0.885
0.878
0.920
0.910
UNC
1
1/
1.145
1.108
1.145
1.106
1.125
1.026
1.122
1.022
0.993
0.986
1.034
1.022
UNC
8
1
1/
1.145
1.110
1.145
1.108
1.125
1.039
1.122
1.035
1.010
1.003
1.046
1.034
UNC
8
1¼
1.270
1.233
1.270
1.231
1.250
1.151
1.247
1.147
1.118
1.111
1.159
1.147
UNC
1¼
1.270
1.235
1.270
1.233
1.250
1.164
1.247
1.160
1.135
1.129
1.171
1.159
8UN
3
1/
1.395
1.356
1.395
1.354
1.375
1.260
1.372
1.256
1.221
1.213
1.269
1.256
UNC
8
3
1/
1.295
1.360
1.295
1.358
1.375
1.288
1.372
1.284
1.260
1.253
1.296
1.284
8UN
8
1½
1.520
1.481
1.520
1.479
1.500
1.385
1.497
1.381
1.346
1.338
1.394
1.381
UNC
1½
1.520
1.485
1.520
1.483
1.500
1.413
1.497
1.409
1.386
1.378
1.421
1.409
8UN
Notes:
1 Maximum values are for class 2A fit only.
3A fit should use 3A pitch diameter tolerance limits as
found in ASME B1.1



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