MIL-DTL-1222J
shall be as shown in table IX. Dimensions of type V hex slotted nuts (large
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diameter) in nominal diameters of 1/ through 3 inches shall be as shown in
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table X.
3.9.7 Dimensions of Coated Fasteners.
3.9.7.1 Externally-threaded fasteners. For fasteners with coated
external threads, class 2A minimum diameters shall apply before coating and
3A maximum diameters shall apply after coating.
3.9.7.2 Externally-threaded fasteners. Threaded fasteners that are to
be coated to a specified minimum coating thickness (see 6.2), shall be made
smaller to accommodate the coating.
a) The maximum pitch diameter
shall be decreased by six times the
coating thickness.
b) The minimum pitch diameter
shall be decreased by four times
the coating thickness.
c) The maximum major diameter
shall be decreased by three times
the coating thickness.
d) The minimum major diameter
shall be decreased by two times the
coating thickness.
3.9.7.3 Internally-threaded fasteners. Internally-threaded fasteners
that are to be coated to a specified minimum coating thickness (see 6.2),
shall be made thinner to accommodate the coating.
a) The minimum pitch diameter shall be increased by six times the
minimum coating thickness.
b) The maximum pitch diameter shall be increased by four times
the minimum coating thickness.
c) The minimum minor diameter shall be increased by three times
the minimum coating thickness.
d) The maximum minor diameter shall be increased by two times the
minimum coating thickness.
3.10 Self-locking elements. When specified (see 6.2), externally-
threaded fasteners shall contain self-locking elements in accordance with
MIL-F-8961 or
3.11 MIL-DTL-18240. When specified (see 6.2), internally-threaded
fasteners shall contain self-locking elements in accordance with
3.12 MIL-DTL-25027.
3.13 Identification marking. Unless otherwise specified (see 6.2),
fasteners shall be marked in accordance with table I and the following
requirements.
3.13.1 Markings. The fastener shall be marked with the material
symbol, the manufacturer's symbol, and the lot number. For fasteners less
than ½ inch, if all the marking on the item can not be applied due to space
limitations, the marking shall be applied using the following order of
precedence: material symbol, manufacturer's symbol, lot number. The material
symbol is mandatory for all fasteners. Marking not included on small
fasteners shall be placed on the container. Markings shall be permanent as
defined in MIL-STD-792, clearly visible and remain clearly visible after the
application of any required coatings (see 3.6.1). Markings on fasteners that
are to be coated shall have a minimum depth of 4 mils.
3.13.2 Location. Marking shall be applied to the top surface of the
head of bolts, hex cap screws and socket head cap screws, the nut end of
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