MIL-DTL-29606A
3.2.5 Silver coated copper alloy strands.
3.2.5.1 Type SCA. The copper alloy strand base material shall conform to ASTM-B624.
The strands shall have a coating thickness of not less than 40 microinches of silver when
measured in accordance with ASTM-B298.
3.2.5.2 Type SCA1. The copper alloy strand base material shall conform to ASTM-B624.
The strands shall have a coating thickness of not less than 80 microinches of silver when
measured in accordance with ASTM-B298. After stranding, the coating thickness on each of the
individual conductor strands shall nowhere be less than 40 microinches of silver when inspected
using micro-section analysis in accordance with ASTM-B961.
3.2.6 Nickel coated copper alloy strands (type NCA). The copper alloy strand base
material shall conform to ASTM-B624. The strands shall have a coating thickness of not less
than 50 microinches of nickel when measured in accordance with ASTM-B355.
3.2.7 Heavy nickel coated copper alloy strands (type NHA). The copper alloy strand base
material shall conform to ASTM-B624. The copper strands shall have a coating thickness of not
less than 27 percent by weight of nickel when measured in accordance with ASTM-B355.
3.2.8 Silver coated ultra-high strength copper alloy strands (type SCU). The ultra-high
strength copper alloy strands shall be made of a copper alloy material capable of meeting all
requirements herein. The strands shall have a coating thickness of not less than 40 microinches
of silver when measured in accordance with ASTM-B298.
3.2.9 Nickel coated ultra-high strength copper alloy strands (type NCU). The ultra-high
strength copper alloy strands shall be made of a copper alloy material capable of meeting all
requirements herein. The strands shall have a coating thickness of not less than 50 microinches
of nickel when measured in accordance with ASTM-B355.
3.2.10 Aluminum strands (type ALU). The aluminum strand material shall conform to
ASTM-B230/B230M.
3.2.11 Type K thermocouple extension conductor (type KPH, KPS, KNH, and KNS).
Type KPH and KPS strands shall be made from an alloy of 90 percent nickel - 10 percent
chromium. Type KNH and KNS strands shall be made from an alloy of 95 percent nickel - 2
percent aluminum - 2 percent manganese - 1 percent silicon and minor traces of other materials
and shall conform to ANSI-MC96.1.
3.3 Conductor stranding. Conductor stranding shall be in accordance with tables II-A
through II-F. No metallic coatings or platings are permitted over the stranded conductor after
stranding.
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