MIL-DTL-12995E
3. REQUIREMENTS
3.1 Material. The material for the wire shall be as specified herein. The best material commercially
available for the intended purpose shall be used when a definite material is not designated.
3.2 Recycled, recovered, or environmentally preferable materials. Recycled, recovered, or
environmentally preferable materials should be used to the maximum extent possible, provided that the
material meets or exceeds the operational and maintenance requirements and promotes economically
advantageous life cycle costs.
3.3 Design and construction.
3.3.1 Wire W-120. Wire W-120 consists of 42 strands of 32 AWG silicon bronze wire, twisted in
six groups of seven strands each and then twisted around a 3-ply or 5-ply cotton thread core forming one
complete cylindrical conductor.
3.3.1.1 Strands. Each strand of silicon bronze alloy wire shall have a diameter of .008 ±.001 inch
(.20 ±.03 mm) (32 AWG).
3.3.2 Joints in conductors. Joints in conductors shall be avoided and in no case shall the joints
exceed two joints per strand per length of wire, with joints spaced not less than 3 feet apart. All joints
shall be butt-brazed fused with silver alloy solder and a non-acid flux. The brazed joint shall be finished
smoothly. No twist joints shall be used. The tensile strength of a section of any strand that includes a
joint shall be not less than 90% of the tensile strength of an adjacent section of the strand of equal length
without joints.
3.4 Performance.
3.4.1 Tensile strength. The tensile strength of the conductor shall be not less than 200 pounds.
3.4.2 Elongation. The elongation of the conductor shall be not less than .80% for a 60 inch
(1524.00 mm) length of conductor.
3.4.3 Continuity. Each conductor shall have continuous continuity.
3.5 Workmanship. The wire shall be uniform in quality and free from defects that affect performance,
serviceability, or appearance, such as lumps, kinks, splits, abrasions, scrapes, corroded surfaces, and
skin impurities.
4. VERIFICATION
4.1 Classification of inspections. The inspection requirements specified herein are classified as
follows:
a. Qualification inspection (see 4.3).
b. Conformance inspection (see 4.4).
4.2 Test equipment and inspection facilities. Test and measuring equipment and inspection facilities
of sufficient accuracy, quality, and quantity to permit performance of the required inspection shall be
established and maintained by the contractor. The establishment and maintenance of a calibration
system to control the accuracy of the measuring and test equipment (i.e., non-Government standard
[NGS] or federal or military standard) shall be in accordance with NCSL-Z540.3 or equivalent.
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