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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 XV.
Cross-reference of type designations.
Commercial
Type and Description
MIL-DTL-1222J
MIL-S-1222H
MIL-S-001222G
Specifications
Type
I, Class a
Type
I, Class a
Type
I, Class a
Type
I, Class b
Type
I, Class b
Type
I, Class b
Full body
Type
I, Class c
Type
I, Class c
Type
I, Class c
Type
I, Class d
Type
I, Class d
Type
I, Class d
Type
II, Class a
Type
II, Class a
Type
II, Class a
Type
II, Class b
Type
II, Class b
Type
II, Class b
No commercial
Reduced body
Type
II, Class c
Type
II, Class c
Type
II, Class c
1
standard
Type
II, Class d
Type
II, Class d
Type
II, Class d
Type
III, Class a
Type
III, Class a
Type
III, Class a
Type
III, Class b
Type
III, Class b
Type
III, Class b
Constant strength body
Type
III, Class c
Type
III, Class c
Type
III, Class c
Type
III, Class d
Type
III, Class d
Type
III, Class d
Continuous thread
Type
IV
Type
IV
Type
IV
Hex
ASME
B18.2.1
Type
I screw
Type
I
Type
I
Heavy hex
ASME
B18.2.1
Type
II
Type
II
Type
II
Heavy hex structural
ASME
B18.2.6
Type
III
Type
III
Type
III
Round head
ASME
B18.5
Type
IV
Round head square neck
ASME
B18.5
Type
V
Hex cap
ASME B18.2.1
Type I
Type I
Type I
Hex socket head cap
ASME B18.3
Type II
Type II
Hex
ASME B18.2.2
Type I
Type I
Type I
Hex jam
ASME B18.2.2
Type II
Type II
Type II
Type III (Semi-
Heavy hex
ASME B18.2.2
Type III
Type III
finished)
Heavy hex jam
ASME B18.2.2
Type IV
Type IV
Type IV
Hex slotted
ASME B18.2.2
Type V
Type V
Notes:
1  Dimensions to MIL-DTL-1222.



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