MIL-DTL-55021D
TABLE III. Cable shield strand size.
Cable core outside diameter
Shield strand size
.060 inch or smaller
38 AWG
.061 to .310 inch
36 AWG
.311 to .750 inch
34 AWG
.751 inch or larger
32 AWG
3.4.2.1 Braid angle and shield coverage. Braid angle and shield coverage shall be as specified in
the applicable specification sheet.
3.4.3 Cable jacket. When jacketing is specified, the cable jacket shall be as specified herein or in the
applicable specification sheet.
3.5 Design and construction.
3.5.1 Color coding. Unless otherwise specified (see 6.2), color coding of individual wires and jackets
shall be in accordance with MIL-STD-681.
3.5.2 Wire twist (twisted pairs and triples). The basic wires shall be grouped together and cabled so
that the individual wire is not twisted and a minimum overall diameter is obtained. Unless otherwise
specified in the contract or order (see 6.2), fillers shall not be used.
3.5.2.1 Direction of lay. The direction of lay may be left hand or right hand.
3.5.2.2 Length of lay. The length of lay shall be as specified in the applicable specification sheet.
3.5.3 Covering over finished cable.
3.5.3.1 Shield. When a shield is specified in the cable construction (see 1.2.1.5), it shall be applied
over the wire(s) as specified herein or in the applicable specification sheet.
3.5.3.2 Jacket. When a jacket is specified in the cable construction (see 1.2.1.5), it shall be applied
over the shielded or unshielded construction as specified herein or in the applicable specification sheet.
3.5.3.3 Jacket material.
3.5.3.3.1 Polyamide. Polyamide jackets shall be applied concentrically and shall have a wall
thickness as specified in the applicable specification sheet. Polyamide material shall conform to
ASTM D4066, type PA 622, grade E 22, or to MIL-C-572.
3.5.3.3.2 Polyvinyl chloride (PVC). PVC jackets shall have a wall thickness as specified in the
applicable specification sheet. The tensile strength and elongation of the jacket shall be 1,800 psi
minimum and 150 percent minimum, respectively.
3.5.3.3.3 Fluorinated ethylene propylene (FEP). FEP jackets shall have a wall thickness as specified
in the applicable specification sheet. The tensile strength and elongation of the jacket shall be 3,000 psi
minimum and 200 percent minimum, respectively.
3.5.3.3.4 Extruded or taped polytetrafluoroethylene (PTFE). Extruded or taped PTFE jackets shall
have a wall thickness as specified in the applicable specification sheet. The tensile strength and
elongation of the jacket shall be 3,000 psi minimum and 150 percent minimum, respectively.
3.6 Performance.
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