MIL-DTL-5898H
breaking strength of not less than 30 pounds. The staycord for cord type WD-34 shall have a maximum
diameter of .055 inches (1.4mm) and shall have a breaking strength of not less than 15 pounds. The
staycord shall not damage the insulation of the conductors when the cord is bent or stretched.
3.7 Cabling.
3.7.1 Cabling of WF-14/U cord.
a. The red and green conductors shall be twisted together with a left-hand lay of approximately
.750 inch (19mm). The white and black conductors shall be twisted together with a left-hand
lay of approximately 1.250 inches (31.8mm).
b. A close wind consisting of a minimum of 32 ends of conducting cotton shall be applied over
each twisted pair. The conducting-cotton wind shall be constructed of fungus-resistant
number 60, 2-ply yarn having a maximum resistance of 1.2 megohms per inch. The
maximum resistance of the wind in the completed cord shall be 1.5 megohms per foot.
c. The two conducting-cotton-wrapped pairs shall be twisted together with a right-hand lay of
approximately 1.500 inches (38.1mm) with a copper braid in one interstice and a staycord in
the other interstice. Fungus-resistant cotton filler shall be used in each interstice to give the
cord a reasonably circular cross section. The two pairs and the copper braid shall be
twisted in such a manner as to assure contact between the braid and both conducting-cotton
wraps.
3.7.2 Cabling of WM-85/U cord. The cabling of cord WM-85/U shall be as specified in 3.7.1a through
3.7.1c, except that a yellow conductor shall be used in the interstice with the staycord.
3.7.3 Cabling of WM-53/U cord. Five conductors in the order specified in table II shall be spiraled
around a central core with a lay of approximately .531 inch (13.5mm). The central core shall contain a
staycord. The conductors shall be wrapped around the central core in such a manner as to provide
relatively free movement of the conductors over the staycord when the finished cord is bent or stretched.
3.7.4 Cabling of WF-5/U cord. The cabling of cord WF-5/U shall be as specified in 3.7.3, except the
yellow conductor shall not be used.
3.7.5 Cabling of WD-34/U cord.
a. The two conductors as specified in table II shall be twisted together with two staycords with
approximately .500 inch (12.7mm) left-hand lay.
b. A close wrap of fine fungus-resistant cotton shall be applied with a right-hand lay over the
cabled assembly.
3.8 Jacket. After cabling, the assembly shall be covered overall and shall be centered in a jacketing
compound formulated so as to fulfill the requirements specified herein. The jacketing material shall not
adhere to the conductor insulation. Optionally, a thin, fungus-resistant, cotton wrapping may be applied
over the assembly before the jacket is applied, provided flexibility is maintained in the finished cord. After
jacketing, the cord shall be reasonably smooth, firmly bound, tough, elastic, and a homogeneous mass.
3.8.1 Jacketing compound. The jacketing compound shall be a low-temperature polychloroprene,
crosslinked polyolefin, or polyurethane, and shall meet the material and physical property as specified in
table III and the operating temperature range and cold bend requirements specified herein.
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