MIL-DTL-5846D
TABLE IX. Bend diameters and loads.
Mandrel Diameter
Maximum Test Load
Gage
(Inches) Bend Test
(Lb) Bend Test
and Code Bend Test
1.0
3
14
1.0
3
16
1.0
2
18
.75
2
20
.75
1
24
.75
1
26
1.0
3
Type 2 Class A
2.0
3
Type 3 Class A
3.0
3
Type 4 Class A
4.3.8 Cold bend. Three straight specimens of the finished wire shall be prepared by
removing 1 inch of insulation at each end to the bare conductor. The wire shall be
subjected to a temperature of -55° C for a period of 4 hours. At the end of this period and
while still at -55° C, the specimens shall be wrapped about a mandrel mounted within the
cold chamber as specified in Table VI, at the rate of one turn in 4 seconds, for a sufficient
number of turns so that the center portion of the wire is subjected to at least two complete
turns. The specimens shall be wrapped and rewrapped in the opposite direction in a
similar manner. Either a revolving or stationary mandrel may be used. The specimens
shall then be removed from the mandrel and, without straightening, shall be subjected to
and meet the requirements of the dielectric test as specified herein. When the test is
conducted on duplex wire, the bend shall be made on the minor diameter of the wire. (see
3.4.4)
4.3.9 Heat resistance. A specimen of finished wire shall be prepared by removing 1 inch
of insulation at each end to the bare conductor. The specimen shall be placed in an oven
maintained at 315° ±5° C for 24 hours. At the end of this time, the specimen shall be
removed and allowed to return to room temperature. The specimen shall then be wound
tightly around a mandrel five times the major diameter of the wire for five close turns and
removed without straightening. The coil section shall then be subjected to and meet the
requirements of the dielectric test as specified herein. There shall be no cracking or other
failure of the insulation as a result of this test. When this test is conducted on duplex
wire, the bend shall be made on the minor diameter of the wire. (see 3.4.5)
4.3.10 Flammability. A 20-inch length of the finished wire shall be marked with fine
threads at distances 5 and 11 inches from one end of the specimen to designate a 6-inch
test length. The specimen shall be held tautly in a horizontal position within a chamber
approximately 2 x 1 x 1 foot, open at the top and one long side, and which allows
sufficient flow of air for complete combustion, which is free from drafts. A flame from a
Bunsen burner shall be applied, for 30 seconds and then removed, to the end of the
specimen from which distances were measured. The Bunsen burner shall have a ¼-inch
21
For Parts Inquires call Parts Hangar, Inc (727) 493-0744
© Copyright 2015 Integrated Publishing, Inc.
A Service Disabled Veteran Owned Small Business