MIL-DTL-28751A
3.3 Mechanical characteristics.
3.3.1 Specific gravity (see 4.4.3). The cable shall have the lowest possible overall specific gravity
consistent with the requirements specified herein. The specific gravity shall not exceed 0.85 when
measured under a hydrostatic pressure of 600 pounds per square inch gage (psig) and at room
temperature (21°C to 23°C) in fresh water. The specific gravity, at atmospheric pressure, in fresh water
shall be not less than 0.70.
3.3.2 Cold bend (see 4.4.4). The cable shall be subjected to and satisfactorily pass the cold bend
requirements of MIL-C-17.
3.3.3 Crack resistance (see 4.4.5). The cable shall be resistant to stress cracking when tested as
specified.
3.4 Construction.
3.4.1 Center conductor. The center conductor of the cable shall be a single strand of No. 16 AWG,
type S, drawn and fully annealed copper wire in accordance with A-A-59551 and of continuous length
(with no joint or splice).
3.4.2 Solid core dielectric. The solid core dielectric shall consist of type I, class B, grade E-4 as
specified in ASTM D1248 having an outside diameter of 0.180 ± .004 inch (4.57 ± 0.10 mm). The surface
of the dielectric shall be smooth so that an O-ring of .070 ± .003 inch (1.78 ± 0.08 mm) cross section and
.145 ± .005 inch (3.68 ± 0.13 mm) I.D. (SAE-AS28775) will seal on the dielectric without any leakage at
any pressure from 0 to 600 psig.
3.4.3 Strength members. The strength members shall consist of at least seventeen strands of .038
inch (0.96 mm) diameter fiberglass as Owens-Corning Fiberglass Co.'s ECT 75-5/3 Latex 2.0 "S" coated
or equivalent, laid on the solid core with a minimum left lay of 20 inches (508 mm).
3.4.4 Jacket. The jacket shall consist of two layers of black foamed polyethylene securely bonded
together. The extreme diameter of the cable shall be .650 ± .025 inch (16.51 ± 0.63 mm). The surface of
the jacket shall be smooth so that an O-ring of 0.360 inch (9.14 mm) cross section and .620 inch (17.75
mm) I.D. will seal anywhere along the entire length of the cable with zero leakage at any pressure from 0
to 600 psig when applied for 2 hours, minimum. The surface of the jacket shall be of uniform hardness
and free of major imperfections such as blow holes, cuts, valleys, and bruises and abrupt changes of
diameter with the tolerance range. Abrupt changes are defined as variations in diameter greater than
.005 inch (0.13 mm) per inch (25.4 mm) of length.
3.4.4.1 Jacket bonding. The cable shall satisfactorily meet the bonding test of 4.4.6.
3.5 Strength.
3.5.1 Breaking strength (see 4.4.7). The cable shall have a minimum breaking strength of 2000
pounds (8896N).
3.5.2 Between center conductor and solid core dielectric. The shear strength between the center
conductor and the solid core dielectric shall be a minimum of 20 pounds (89N) per linear foot (305 mm) of
cable.
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