MIL-DTL-29606A
3.
REQUIREMENTS
3.1 Detail specification. The individual item requirements shall be as specified herein and
in accordance with the ASTM or ANSI document when applicable. In the event of any conflict
between requirements of this specification and the ASTM or ANSI standards (see 2.3), this
specification shall govern.
3.1.1 First article. When specified (see 6.2), a sample shall be subjected to first article
inspection (see 6.3) in accordance with 4.5.
3.1.2 Statistical Process Control (SPC) for silver coated copper conductors. For silver
coated copper conductors only, the manufacturer is required to establish and maintain an SPC
system that meets the requirements of EIA-557 for control of silver coating circumferential
non-uniformity (see 6.5.6) and local minimum silver coating thickness (see 6.5.7).
3.2 Conductor strand material. All strands used in conductors specified herein shall
conform to the applicable ASTM or ANSI standards for the proper material listed in table I.
After stranding conductor, strands shall be free from lumps, kinks, splits, scraped or corroded
surfaces, and skin impurities. In addition, the strands shall conform to the following
requirements as applicable.
3.2.1 Tin coated copper strands (type TCC). Tin coating shall be in accordance with
ASTM-B965, except steam conditioning is not required for solderability testing.
3.2.2 Silver coated copper strands.
3.2.2.1 Type SCC. The strands shall have a coating thickness of not less than 40
microinches of silver when measured in accordance with ASTM-B298. No exposed copper
shall be identified during magnification aided visual inspection of stranded conductor.
3.2.2.2 Type SCC1. 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. No exposed copper shall be identified during magnification aided visual
inspection of stranded conductor.
3.2.3 Nickel coated copper strands (type NCC). The strands shall have a coating thickness
of not less than 50 microinches of nickel when measured in accordance with ASTM-B355.
3.2.4 Heavy nickel coated copper strands (type NHC). 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.
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