MIL-DTL-27072E
TABLE XIII. Cable cold bend test temperature and mandrel size.
Sheath material designator (see 1.2.1.1)
A
B
D and E
Cable outside
Temperature
diameter OD
1/
-40°C
-55°C
-55°C
inches (mm)
Mandrel size
.000 (.00) through
3 X OD
3 X OD
3 X OD
.300 (7.62)
.301 (7.65) through
3 X OD
3 X OD
3 X OD
.350 (8.89)
.351 (8.92) through
3 X OD
3 X OD
3 X OD
.450 (11.43)
.451 (11.46) through
4 X OD
4 X OD
4 X OD
.550 (13.97)
.551 (14.00) through
5 X OD
5 X OD
5 X OD
.750 (19.05)
.751 (19.08) through
6 X OD
6 X OD
6 X OD
.850 (21.59)
.851 (21.62) through
8 X OD
8 X OD
8 X OD
.950 (24.13)
.951 (24.16) through
10 X OD
10 X OD
-
1.500 (38.10)
1.501 (38.13)
15 X OD
15 X OD
-
through 2.000
(50.80)
2.001 (50.83) and
20 X OD
20 X OD
-
over
1/ Dimensions are in inches. Metric equivalents are given for information only.
4.3.6 Cable stripe and marking durability. A short specimen of finished cable shall be firmly clamped
in a horizontal position with its upper longitudinal surface area freely exposed. A steel mandrel (.025
diameter ±.001 inch (.635 diameter +/-.025 mm) shall be repeatedly rubbed over the surface at the stripe
or mark so that the longitudinal axis of the mandrel and specimen shall be at right angles to each other.
A weight shall so be attached to the jig holding the rubbing mandrel such that the combined jig and weight
exert a 500-gram thrust normal to the surface. A motor-driven reciprocating cam mechanism and counter
shall be used to permit an accurately measured number of abrasion strokes. The length of the stroke in
each direction shall be .375 inch (9.52 mm), the frequency of the stroke shall be 100 strokes per minute,
and the number of strokes shall be not less than 300 (150 cycles). The direction of the motion shall be
along the axis of the specimen and perpendicular to the axis of the mandrel. The procedure shall be
repeated on two additional specimens of wire or cable selected 50 feet (3.66 m) apart on a sample. No
letter or number shall be illegible when examined following the test. This testing shall not be performed
on cables with sheaths using the indent marking method of identification.
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