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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 I.
Commercial specification, grade, material symbol and additional requirements to certify items
meeting commercial standards to this specification. - Continued
MIL-DTL-1222
Commercial
Additional requirements
Military
Fastener  3
Material
Applicable4
1
2
Grade
Form
Standard
Material
Condition
symbol
Paragraphs
Condition
S5
CW2
3.3, 3.4, 3.6.4
5
A
A
305An
3.3, 3.6.4, 3.8
ASTM
6
F 594
305
Nut
Group 1
CW1
3.3, 3.6.4
5
305
CW
S5
CW2
3.3, 3.6.4, 3.8
5
A
A
316An
3.3, 3.6.4, 3.8
ASTM
7
F 594
316
Nut
Group 2
CW1
3.3, 3.6.4
5
CW
316
S5
3.3, 3.4, 3.6.4
CW2
5
A
A
321An
3.3, 3.6.4, 3.8
ASTM
8
F 594
Group 3
321
Nut
CW1
3.3, 3.6.4
5
CW
321
S5
3.3, 3.4, 3.6.4
CW2
5
A
A
347An
3.3, 3.6.4, 3.8
ASTM
8
347
Nut
Group 3
CW1
3.3, 3.6.4
5
F 594
CW
347
3.3, 3.4, 3.6.4
CW2
5
A
A
384An
3.3, 3.6.4, 3.8
ASTM
6
384
Nut
Group 1
CW1
3.3, 3.6.4
5
F 594
CW
384
3.3, 3.4, 3.6.4
CW2
5
3.3, 3.3.1,
T
H
410T
ASTM
9
Group 5
410
Nut
3.3.3, 3.4,
5
F 594
H
HT
410H
3.6.4
5
3.3, 3.3.1,
T
H
416T
ASTM
9
416
Nut
Group 5
3.3.3, 3.4,
5
F 594
H
HT
416H
3.6.4
5
3.3, 3.3.1,
T
H
416SeT
ASTM
9
416Se
Nut
Group 5
3.3.3, 3.4,
5
F 594
H
HT
416SeH
3.6.4
5
H
H
431T
3.3, 3.6.4
ASTM
Group 6
431
Nut
5
F 594
3.3, 3.4, 3.6.4
HT
431H
HT
Annealed and
ASTM
6
5
630
Nut
Group 7
AH
630
3.3
Age Hardened
F 594
Socket
ASTM
3.3, 3.4,
6
5
Group 1
304
Head Cap
A
CW
304An
F 837
3.6.4, 3.8
Screw
Socket
ASTM
3.3, 3.4,
6
5
305
Head Cap
A
Group 1
CW
304An
F 837
3.6.4, 3.8
Screw
Socket
ASTM
3.3, 3.4,
6
5
Group 1
384
A
CW
304An
Head Cap
F 837
3.6.4, 3.8
Screw
Socket
ASTM
3.3, 3.4,
Alloy 316
5
316
A
CW
316An
Head Cap
F 837
3.6.4, 3.8
or 316L
Screw
S2, S4



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