MIL-DTL-1222J
3 REQUIREMENTS
3.1 General requirements. Fasteners shall meet the requirements of the
applicable commercial standard cited in table I as modified herein.
3.2 Manufacturing process. Fasteners may be produced by any
manufacturing process permitted by the specifications and standards cited in
table I using any rod, bar or wire capable of meeting the requirements of
this specification, including the material and fastener specifications cited
in table I, except as specified below.
3.2.1 Grade 410, 416, 416Se, and 431 externally-threaded fasteners.
When aluminum is used in the production of grade 410, 416, 416Se, and 431
fasteners, the maximum residual aluminum content shall be 0.05 percent.
Grade 410, 416, 416Se, and 431 fasteners in condition I shall have a maximum
sulfur content of 0.010 percent and a maximum phosphorus content of 0.020
percent.
3.2.2 Grade 625 fasteners. The metal used in the production of the
bar, rod, or wire used to make grade 625 fasteners shall be refined using the
electroslag remelting process (ESR) or the vacuum arc remelting process
(VAR).
3.2.3 Titanium Alloys. The metal used in the production of the bar,
rod, or wire used to make grade T7 fasteners shall be produced by multiple
melting using consumable electrode practice. The last melting cycle shall be
under vacuum. Barstock used to make titanium fasteners shall be ultrasonic
inspected in accordance with AMS 2631. Barstock 2½ inches or smaller shall
meet the requirements of acceptance class A1 and barstock over 2½ inches
shall meet the requirements of acceptance class A.
3.3 Heat treatment. Unless otherwise approved (see 6.2), heat
treatments shall be controlled in accordance with AMS 2750 or MIL-STD-1684.
Fasteners shall be heat treated in accordance with the applicable
commercial specification listed in table I and as specified below:
3.3.1 Martensitic stainless steel bolts, hex cap screws, and studs.
When condition I is specified, the martensitic alloys 410, 416, 416Se, and
431 shall be hardened and tempered by heating to 1725 ± 25°F sufficient for
austenitization, held for at least ½ hour, rapid air- or oil- quenched,
reheated to 1125°F minimum, for at least 1 hour, and air cooled, to provide
the specified properties.
3.3.2 Martensitic stainless steel socket head cap screws. When
condition I is specified, the martensitic alloys 410, 416, 416Se, and 431
shall be hardened and tempered by heating to 1725 ± 25°F, held for at least
½ hour until the alloy is austenitized, rapid air- or oil- quenched,
reheated to 1125°F minimum, for at least 1 hour, and air cooled, to provide
the specified properties. When condition H is specified, the martensitic
alloys 410, 416, 416Se, and 431 shall be hardened and tempered by heating
to 1725 ± 50°F, held for at least 1 hour until the alloy is austenitized,
rapid air- or oil- quenched, reheated to 1050°F minimum, for at least 1
hour, and air cooled, to provide the specified properties. When condition
HT is specified, the martensitic alloys 410, 416, 416Se, and 431 shall be
hardened and tempered by heating to 1725 ± 50°F, held for at least 1 hour
until the alloy is austenitized, rapid air- or oil- quenched, reheated to
525°F minimum, for at least 1 hour, and air cooled, to provide the
specified properties.
3.3.3 Externally threaded martensitic stainless steel fasteners.
Externally threaded martensitic stainless steel fasteners produced by hot
heading shall be quenched and tempered after heading.
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