MIL-DTL-83140B
3.2 Materials. The wire (see 6.4.9) used in the fabrication of the wire rope shall be
composed of corrosion resistant steel S30200 or S30400 in accordance with ASTM A492 or SAE
HS-1086 and shall be cylindrical, smooth, and of uniformly high quality.
3.2.1 Wire properties. The wire used shall be suitable for manufacture into wire rope
that will meet the performance requirements of this specification. Tensile strength and wire sizes
will be determined by the wire rope manufacturer and shall be of sufficient strength and size to
meet the performance requirements of this specification.
3.2.1.1 Ductility of steel. The wire shall not fracture when wrapped in accordance with
4.4.2 prior to wire rope fabrication.
3.2.2 Preforming of wire and strands. The individual wires and strands composing the
wire rope shall be preformed (see 6.4.5) into the exact helical position they will have in the
finished wire rope, so that if the wire rope is cut or severed, there will be no tendency for the
normal diameter (see 6.4.1) of the wire rope at the unseized ends to increase by more than the
amount specified in table I.
TABLE I. Construction and physical properties.
Allowable
Nominal
increase in
Breaking
diameter
Tolerance
diameter at
strength of
Weight per
of wire
on diameter
unseized end
wire rope
100 feet
rope
(plus only)
(maximum)
(minimum)
(approximate)
(inch)
Construction
(inch)
(inch)
(pounds)
(pounds)
5/32
19 x 7
0.008
0.017
2,160
4.50
19 x 7
3/16
0.009
0.019
3,330
6.50
19 x 7
7/32
0.010
0.020
4,500
8.60
19 x 7
1/4
0.012
0.021
5,760
11.00
19 x 7
5/16
0.016
0.024
8,100
17.30
19 x 7
3/8
0.020
0.027
10,800
24.30
19 x 7
1/2
0.025
0.034
20,520
45.80
19 x 7
5/8
0.030
0.040
31,500
71.50
7/32
10 x 7
0.010
0.020
4,500
8.60
(7 x 19 IWRC)
3.3 Joining. Splices in individual wires shall be brazed or welded. No wire splices in
any size wire shall be made by twisting. Splices in individual wires in any layer of a strand
(see 6.4.8) shall not be closer than 20 feet. Any brazed or welded wire that protrudes in excess of
one percent of the normal wire rope diameter shall be cause for rejection.
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