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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
As Formed or
As Formed or
ASTM
15
5
675
675
Nut
Cu 675
Stress
Stress
F 467
Relieved
Relieved
As Formed or
Ni 400
As Formed or
Hex Cap
ASTM
5
Stress
NC
QQ-N-281,
Stress
3.4
400
Screw
F 468
Relieved
class a
Relieved
Stud
Hex Cap
Solution
ASTM
Ni 500
Annealed and
5
500
Screw
Annealed and
3.3, 3.3.4, 3.4
.K.
F 468
QQ-N-286
Age Hardened
Stud
Aged
Hex Cap
ASME
ASTM B 446
10
625
Annealed
3.2.2, 3.3, 3.4
Annealed
625
Screw
B18.2.1
Grade 1
Stud
ASME B1.1
As Formed or
Ni 400
As Formed or
Socket
ASME
10
Stress
NC
QQ-N-281,
Stress
3.4
400
Head Cap
B18.3
Relieved
class a
Relieved
Screw
Socket
Solution
ASME
Annealed and
3.3, 3.3.4,
10
500
Head Cap
Annealed and
QQ-N-286
.K.
B18.3
Age Hardened
3.4
Screw
Aged
Socket
ASME
ASTM B 446
10
625
Head Cap
Annealed
Annealed
625
3.2.2, 3.3, 3.4
B18.3
Grade 1
Screw
As Formed or
Ni 400
As Formed or
ASTM
17
5
400
Nut
NC
3.4
Stress
QQ-N-281,
Stress
F 467
Relieved
class a
Relieved
As Formed or
Ni 405
As Formed or
ASTM
NCR or NC-
17
3.4
405
Nut
Stress
QQ-N-281.
Stress
5
F 467
R
class b
Relieved
Relieved
Solution
ASTM
Ni 500
Annealed and
5
.K.
3.3
500
Nut
Annealed and
F 467
QQ-N-286
Age Hardened
Aged
Annealed
ASME
ASTM B 446
10
Annealed
625
625
Nut
3.2.2, 3.3, 3.4
B18.2.2
Grade 1



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