MIL-DTL-2439F
3.2 Outer and cover tube construction. The outer and cover tubes shall be spirally wound. For
materials, winding sequence and other details for outer and cover tubes see Figure 1 (Type I, II,
and III containers), Figure 2 (Type IV containers), or Figure 3 (Type V containers). Windings
shall be lapped as shown in Figure 7. Tube windings shall be securely adhered to each other.
No waterproof layer shall be cut in subsequent crimping operations. A hairline of adhesive, not
more than 1/32 inch in width or 1/64 inch in height, shall be permitted beyond the edge of the
outer layer for the asphalt impregnated paper (Types I, II and III containers), the seven point
Kraft paper (Type IV container), or the poly lam layer (Type V container) to which the adhesive
is applied on outer and cover tubes, only.
3.3 Neck tubes.
3.3.1 Neck tube construction. The neck tubes shall be spirally wound. For materials, winding
sequence and details for neck tubes see Figure 4 (Type I, II, and III containers) or Figure 5 (Type
IV containers), or Figure 6 (Type V containers). Windings shall be lapped as shown in Figure 7.
Tube windings shall be securely adhered to each other. No waterproof layer shall be cut in
subsequent crimping operations.
3.3.2 Neck tube vent holes. Neck tubes may be perforated with vent holes as required (see
Figure 8) to provide pressure relief in closing and opening the container. When the exposed
length of the neck tube (portion holding the cap) is less than 2.5 inches, vent holes will not be
required.
3.3.3 Neck tube security. Any adhesive remaining on the exposed exterior surface of the neck
tube, after assembly, shall be removed. Neck tubes, when glued to the outer tube, shall
withstand the torque requirements specified in Table I without movement in the tube.
TABLE I. Torque requirements.
Outside Diameter of Outer
Torque to be Applied (Inch-Pounds,
Container
Minimum)
3 inches or less
50
Greater than 3 inches
100
3.4 Neck ring. Neck rings shall also be applied to fiber container neck tubes that open at both
ends, as required. Construction details shall be in accordance with Figure 8.
3.4.1 Neck ring material. All neck rings, including alternate designs, shall be made from 33
gage, minimum, commercial black-plate.
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