MIL-DTL-55668D
6.2.1 Cord procurement data. The contract or order should specify the type of cord (see 1.2), number of
insulated conductors (shielded and unshielded), and total length of cord. For retractile cords, the length
of helix or number of turns, length of straight ends, and overall length of cord should be specified. In the
event of any conflict between requirements of this specification and the contract or order, the latter will
govern.
6.2.2 Indirect shipments. The preservation, packaging, packing and marking specified in section 5 apply
only to direct purchases by or direct shipments to the government, and are not intended to apply to
contracts or orders between the supplier and prime contractor.
6.3 Resistance values. Typical approximate resistance values for conductors and shields (corrected to
20 ºC) in a finished straight cord 120 inches long, or a finished retractile cord with a 12.5 inch (305.5 mm)
length of helix (rated for extension to 75 inches) and 6 inch (152 millimeter) long straight ends, are:
0.44
Stranded wire cord:
Conductor
-
2.5
Shield
-
2.3
Tinsel wire cord:
Conductor
-
2.5
Shield
-
6.4 First article inspection. Information pertaining to first article inspection of cords covered by this
specification should be obtained from the procuring activity for the specific contracts involved (see 3.1).
6.4.1 First article inspection on repeat orders. First article inspection will not be required from a supplier
who has manufactured the same type cord (same type of wire, number of conductors, number of shielded
conductors, same materials, etc.) on a previous order or contract within 2 years of the current order or
contract, and which passed first article inspection at that time. A supplier who has passed first article
inspection on a cord of a type classification as specified in 1.2 will be considered qualified on cords of the
same type classification providing these cords contain the same total number of conductors and shielded
conductors as, or a lesser total number of conductors or shielded conductors than the cords previously
qualified and satisfactorily manufactured.
6.5 Meter relay. The meter relay called out in the basic circuit was Nalder Bros. & Thompson Ltd.,
London, Eng. Model SR6W5, zero center, approximate full-scale sensitivity 45 mv, or equal.
6.6 Control relay. The control relay used was a Potter & Brumfield (P&B) KRP II, or equal.
6.7 Subject term (key word) listing.
Bending
Elongation
Force
Shield
Staycord
Strength
Stretch
Stranded
Tinsel
6.8 Environmental. Environmental pollution prevention measures are contained in the packaging
material specifications referenced herein. Refer to material specifications or preparing activity for
recommended disposability methods.
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