TABLE
31
MINIMUM BREAKING
FORCE
OF
WIRE
ROPE
18 x 7 ConstructionIRotation Resistant/Brlght (Uncoated)
Nominal Diameter Approximate Mass
Minimum Breaking Force*
Improved
Extra
bnproved
Plow
Steel** Plow Steel**
inches
mm
Ih/ft kg/m tons metric tonnes
tons metric tonnes
112
12.7
0.43 0.64
9.85
8.94
10.8 9.8
9/16 14.3 0.55 0.82 12.4
11.2
13.6
12.3
5/8 15.9
0.68 1.01 15.3 13.9
16.8 15.2
3/4
19.1 0.97
1.44
21.8 19.8
24.0 21.8
7/8
22.2 1.32 1.96 29.5
26.8
32.5 29.5
25.4 1.73 2.57 38.3 34.7
42.2 38.3
1-1/8
28.6 2.19 3.26 48.2
43.7 53.1 48.2
1-114
31.8 2.70 4.02 59.2
53.7 65.1
59.1
1-3/8
34.9 3.27 4.87 71.3 64.7
78.4 71.1
1-1/2
38.1
3.89 5.79 84.4 76.6
92.8
84.2
*
To
convert to Kilonewtons (kN), multiply tons (nominal Strength) by 8.896; I lb
==
4.448 newtons (N).
**
Available with galvanized wires at strengths
10%
lower than listed, or at equivalent strengths on special request.
The minimum breaking forces
aTe
applicable only when a test is conducted on a new rope that is fixed at both
ends. When the rope is in use, the breaking force
is
reduced when one end is free to rotate.
106·
Wire Rope Technical Board - Wire Rope Users Manual, Fourth Edition
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