MIL-DTL-3849/11C
REQUIREMENTS:
Dimensions and configuration. See figure 1.
This specification sheet describes a jacketed three-wire cable construction where extreme flexibility is
required.
Materials and construction:
Wire construction:
Uncoated tinsel wire conductor, type V in accordance with MIL-W-3795.
Polyamide insulation in accordance with ASTM D4066, polyhexamethyleneamide, low water
absorption, extruded over the tinsel wire conductor. The following requirements shall apply:
Property values for nylon plastic:
a. Melting point range: 208°C to 220°C.
b. Specific gravity: 1.05 to 1.09.
c. Deformation under load, 2,000 psi: 4 percent maximum.
d. Stiffness: 140,000 psi minimum.
e. Tensile strength at 23°C: 7,000 psi minimum.
f. Elongation: 50 percent minimum.
g. Impact strength at 23°C: 0.90 foot-pounds per inch of notch (natural color,
pigments may lover values).
h. Heat-distortion:
(1) At 66 psi fiber stress: 149°C minimum.
(2) At 264 psi fiber stress: 52°C minimum.
I. Water-absorption: 0.7 percent maximum.
J. Moisture content: 0.28 percent maximum.
Electrical properties:
a.
Insulation resistance: 5 Megohms.
b.
Dielectric strength: 375 volts per mil.
c.
Dielectric constant, at 1 megacycle: 4.0 maximum.
d.
Dissipation factor, at 1 megacycle: 0.11 maximum.
Thickness of insulation:
.003 inch (0.76 mm) minimum.
.005 inch (0.13 mm) maximum.
Insulation color coding shall be in accordance with MIL-DTL-3849.
Cable construction:
Three insulated tinsel wire conductors twisted together with the length of lay .375 inch (9.53 mm)
nominal .4375 inch (11.113 mm) maximum.
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