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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 IX.
Type I hex nut and type II hex jam nuts not covered in ASME B18.2.2.
H
H
A PRO
P  X
F
1/64"
G
30°
30°
Width across
Width across
Nominal size
Corners
Thickness nuts
Thickness jam nuts
flats
or basic major
G
F
H
H
diameter of
Max
thread
Min
Max
Min
Nominal
Max
Min
Nominal
Max
Min
(basic)
3
31
1/
2.6250
2.538
3.031
2.893
1½
1.540
1.460
/2
1.009
0.929
4
3
23
3
2
3.0000
2.900
3.464
3.306
1 /2
1.763
1.675
1/2
1.138
1.050
3
3
59
13
2¼
3.3750
3.262
3.897
3.719
1 /4
1.970
1.874
1 /4
1.251
1.155
6
6
9
29
2½
3.7500
3.625
4.330
4.133
2/4
2.193
2.089
1 /4
1.505
1.401
6
6
3
23
37
1.634
1.522
2/
4.1250
3.988
4.763
4.546
2 /4
2.415
2.303
1 /4
4
6
6
37
45
3
4.5000
4.350
5.196
4.959
2 /4
2.638
2.518
1 /4
1.763
1.643
6
6



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