MIL-DTL-83420M
4.3.5 Nylon certification. For each contract or order, a certification from the nylon
manufacturer shall verify that the nylon meets the requirements of this specification (3.3.3.3 and
3.3.3.3.1) (see 6.3). The certification will be retained on file at the manufacturer's facility for a
minimum of 7 years.
4.4 Test methods.
4.4.1 Wire flexibility.
4.4.1.1 Ductility of steel. A specimen from the wire sample shall be wrapped in a way
that does not cause indenting. The wire shall be wrapped around a cylindrical mandrel for 2
complete turns in a close helix at a rate not exceeding 15 turns per minute. The cylindrical
mandrel diameter shall be equal to the nominal wire diameter being tested for composition B,
and two times the nominal diameter being tested for composition A.
4.4.1.2 Adherence of coating. A specimen from the tin or zinc coated wire sample shall
be capable of being wrapped at a rate not to exceed 15 turns per minute in close helix of at least
2 turns around a cylindrical mandrel equal to 2 times the nominal diameter of the wire under
tests without cracking or flaking the tin or zinc coating to such an extent that any tin or zinc can
be removed by rubbing with the bare finger.
4.4.2 Examination of product. Each sample of wire rope shall be visually examined for
workmanship and finish to determine compliance with 3.7.
4.4.2.1 Concentricity test for type II wire rope. All type II wire rope shall be examined
for concentricity as specified in 3.7.1.1. The wall thickness shall be measured 180 degrees apart
in two 90 degrees planes. The percent variation in wall thickness shall be calculated as follows:
Difference between the two measurements C and D
Percent variation = ------------------------------------------------------------------------- x 100≤20%
Smaller of the two measurements
This calculation shall be repeated for dimensions A and B.
4.4.2.2 Conformance test to preforming of wire rope. To test wire rope for conformity to
values shown in table I for increase in diameter, the wire rope shall be mechanically cut with a
cutter having constricting jaws. A plain shear with straight blades distorts the product and may
void the test. After cutting, the wire rope shall be measured by passing the wire rope through a
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