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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
they must have additional inspections to show they meet the mechanical
property, decarburization, dimensional and workmanship requirements of this
specification when using the tighter sampling plan of MIL-DTL-1222.  In
addition, not all fasteners that pass the mechanical property tests of
ASTM A 193 will pass the mechanical tests of MIL-DTL-1222.  MIL-DTL-1222 has
a maximum strength level that is not in ASTM A 193, a lower maximum hardness
requirement, and requires that fasteners over 2½ inches in diameter have
higher minimum tensile properties than ASTM A 193.
6.11 Subject term (key word) listing.
Constant strength studs
Decarburization
Fasteners
Hex cap screws
Hydrogen embrittlement
Magnetic permeability
Nondestructive inspection
Protective coatings
Socket head cap screws
Threads
6.12 Changes from previous issue.  Asterisks are not used in this
revision to identify changes with respect to the previous issue due to the
extensiveness of the changes.
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