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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
h) Field 8 is "SC" for an annealed 316 material grade.
i) Field 9 is "N" for no locking element.
j) Field 10 is "N" for no coating.
3
A.1.3.4 NUT.  A / inch nominal diameter nickel-aluminum-bronze (632)
4
nut with a locking mechanism and fine class 2A threads and a phosphate coating
would have a part number of "M1222N1X12F20CFLP".
a) Field 1 is "M1222".
b) Field 2 is "N1" for hex nut.
c) Field 3 is "X" washer faced or chamfered.
th
3
1
d) Field 4 is "12" for / inch or 12 x /  6  inches, nominal
4
1
diameter.
e) Field 5 is "F" for UNF threads.
f) Field 6 is "2" for class 2A threads.
g) Field 7 is "0" for nuts.
h) Field 8 is "CF" for a nickel-aluminum-bronze material grade.
i) Field 9 is "L" because there is a locking element.
j) Field 10 is "P" for a phosphate coating.
Custodian:
Preparing Activity:
Air Force ­ 99
Navy ­ SH
(Project 53GP-0315)
Navy ­ SH
Review activities:
Navy - MC
DLA - IS
50



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