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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 VIII.
Type I Hex Cap Screws not covered in ASME B18.2.1.
H
F
APPROX 1/64"
G
30°
R
Width across
Width across
Body
Nominal size
corners
flats
diam3eter
or basic
Height
Radius of fillet
G
F
major
H
R
diameter of
Max
thread
(basic)
Min
Max
Min
Nominal
Max
Min
Min
Max
Max
3¼
3.335
4.8750
4.712
5.629
5.372
2
2.064
1.936
0.125
0.188
1
3½
3.589
5.2500
5.075
6.062
5.786
2/
2.193
2.057
0.125
0.188
8
5
3¾
3.858
5.6250
5.437
6.495
6.198
2/6
2.385
2.241
0.125
0.188
1
4
4.111
6.0000
5.800
6.928
6.612
2½
2.576
2.424
0.125
0.188
Notes:
1 Dimensions given in inches.
2 Notes pertaining to hex cap screws contained in ASME B18.2.1 shall apply.
3 There may be a reasonable swell or fin under the head or die seam on the body not to exceed the
nominal body diameter by 0.183 for sizes over 3 inches



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