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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
3.3, 3.4,
5
A
A
304An
ASTM
Bolt, Hex
3.6.4, 3.8
6
F 593
Group 1
304
Cap Screw,
CW1
5
S5
or Stud
CW
3.3, 3.4, 3.6.4
304
CW2
3.3, 3.4,
5
A
A
305An
ASTM
Bolt, Hex
3.6.4, 3.8
6
F 593
Group 1
305
Cap Screw,
CW1
5
S5
or Stud
CW
305
3.3, 3.4, 3.6.4
CW2
3.3, 3.4,
5
A
A
316An
ASTM
Bolt, Hex
3.6.4, 3.8
7
F 593
Group 2
316
Cap Screw,
CW1
5
S5
or Stud
CW
316
3.3, 3.4, 3.6.4
CW2
3.3, 3.4,
5
A
A
321An
ASTM
Bolt, Hex
3.6.4, 3.8
8
F 593
Group 3
321
Cap Screw,
CW1
5
S5
or Stud
CW
321
3.3, 3.4, 3.6.4
CW2
3.3, 3.4,
5
A
A
347An
Bolt, Hex
ASTM
3.6.4, 3.8
8
347
Cap Screw,
F 593
Group 3
CW1
5
or Stud
S5
CW
347
3.3, 3.4, 3.6.4
CW2
3.3, 3.4,
5
A
A
384An
ASTM
Bolt, Hex
3.6.4, 3.8
6
F 593
Group 1
384
Cap Screw,
CW1
5
S5
or Stud
3.3, 3.4, 3.6.4
CW
384
CW2
5
T
H
410T
3.2.1, 3.3,
ASTM
Bolt, Hex
9
5
F 593
3.3.1, 3.3.3,
Cap Screw,
Group 5
410
H
HT
410H
S5
3.4, 3.6.4, 3.7
or Stud
I
410I
5
T
H
416T
ASTM
3.2.1, 3.3,
Bolt, Hex
9
5
F 593
3.3.1, 3.3.3,
Cap Screw,
Group 5
416
H
HT
416H
S5
3.4, 3.6.4, 3.7
or Stud
I
416I
5
T
H
410SeT
ASTM
3.2.1, 3.3,
Bolt, Hex
9
5
F 593
Group 5
3.3.1, 3.3.3,
416Se
Cap Screw,
H
HT
410SeH
S5
3.4, 3.6.4, 3.7
or Stud
416SeI
I
5
H
H
431T
3.2.1, 3.3,
Bolt, Hex
ASTM
5
3.3.1, 3.3.3,
431
Cap Screw,
F 593
Group 6
HT
HT
431H
3.4, 3.6.4, 3.7
or Stud
S5
431I
I
Bolt, Hex
ASTM
Annealed and
6
5
630
Cap Screw,
F 593
Group 7
AH
630
3.3, 3.6.4, 3.7
Age Hardened
or Stud
S5
6
5
304
Nut
A
ASTM
Group 1
A
304An
3.3, 3.6.4, 3.8
5
F 594
3.3, 3.6.4
CW
CW1
304



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