MIL-DTL-18375H
specimen shall be tested per test. All the specimens shall be from the respective wire rope
sample taken in accordance with 4.3.2.1.
a.
Breaking strength (4.5.2).
b.
Endurance test (4.5.3).
c.
Stretch test (4.5.4).
d.
Test load (4.5.6).
e.
Magnetic permeability (4.5.7).
4.4 Certification. For each contract or order, the wire rope manufacturer shall certify
specification. The certification shall include, as a minimum, actual results of the tests specified
herein and shall be retained on file at the manufacturer's facility for a minimum of 7 years.
4.5 Test methods.
4.5.1 Examination of product.
4.5.1.1 Examination of product. Each sample of wire rope shall be visually examined
for workmanship and finish to determine compliance with 3.6.
4.5.1.2 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
hole drilled to a diameter increased as shown in table I under "Allowable increase in diameter at
cut end" or by using a shadowgraph with suitable magnification. The allowable increase in
diameter shall be applied to the actual diameter of the wire rope being tested.
4.5.1.3 Identification of product. Each wire rope and shipping reel shall be inspected for
4.5.2 Breaking strength. A specimen for each size and construction of wire rope shall be
selected from the sample from each lot. The specimen shall be no less than 24 inches in length,
and where necessary, swaged terminals conforming to MIL-DTL-781 (do not use ball end
fittings) and accompanying hardware may be used to facilitate installation of the specimen in the
jaws of the testing machine. The length of wire rope sample under load shall be no less than 10
inches. The breaking strength shall be determined by use of a tensile testing machine in
accordance with applicable requirements of ASTM E 8. The breaking strength shall conform to
the requirement of table I. In case of failure due to an unsatisfactory end termination, the test
will be disregarded and a new test conducted.
4.5.3 Endurance test. The wire rope specimen and test machinery shall conform to
respective wire rope sizes. The total travel of the wire rope per reversal shall be 13 1/2 inches.
The test sheaves shall be made of steel and shall conform to the dimensions of figure 2 and
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