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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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MIL-DTL-1222J
Bolts
Type II  ­
Heavy hex
Type III ­
Heavy hex structural
Screws
Type I
-
Hex cap
Type II
-
Socket head cap
Nuts
Type
I
-
Hex
Type
II
-
Hex jam
Type
III
-
Heavy hex
Type
IV
-
Heavy hex jam
Type
V
-
Hex slotted
1.2.2 Material grades and conditions.  The following military grades and
conditions are covered in this specification:
MATERIAL Grade
CONDITION
ALLOY TYPE
Alloy Steel
B7
Hardened and Tempered
B16
Hardened and Tempered
A574
Hardened and Tempered
2H
Hardened and Tempered
Hardened and Tempered
4
Hardened and Tempered
5
7
Hardened and Tempered
Hardened and Tempered
8
Hardened and Tempered
4340
Aluminum
2024
Solution Treated and Naturally Aged
6061
Solution Treated and Artificially Aged
7075
Solution Treated and Stabilized
As Formed or Stress Relieved
Carbon Steel
2
Copper Alloy
462
As Formed or Stress Relieved
464
As Formed or Stress Relieved
482
As Formed or Stress Relieved
510
As Formed or Stress Relieved
544
As Formed or Stress Relieved
632
Quenched and Tempered
As Formed or Stress Relieved
655
661
As Formed or Stress Relieved
As Formed or Stress Relieved
670
675
As Formed or Stress Relieved
2



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