TABLE 19 MINIMUM BREAKING
FORCE
OF
WIRE
ROPE
6 x 7 Classification/Bright (Uncoated), Fiber Core
Nominal Diameter Approximate Mass Minimum Breaking Force*
Improved
Plow Steel**
inches
mm
Ib/ft kg/m tons metric tonnes
114
6.4 0.09
0.14
2.64 2.40
5/16 7.9 0.15 0.22 4.10
3.72
3/8
9.5
0.21 0.31 5.86 5.32
7/16 11.1 0.29
0.43
7.93 7.20
112
12.7 0.38 0.57
lO.3
9.35
9/16 14.3
0.48
0.71 13.0
11.8
5/8 15.9 0.59 0.88
15.9 14.4
3/4 19.1
0.84 1.25
22.7
20.6
7/8 22.2 1.15
1.71
30.7 27.9
1 25.4
1.50 2.23
39.7
36.0
1-1/8 28.6 1.90 2.83
49.8 45.2
1-114
31.8 2.34 3.48 61.0
55.3
1-3/8
34.9
2.82 4.23 73.1 66.3
1-1/2 38.1 3.38
5.03 86.2
78.2
*
To
convert to Kilonewtons (kN), multiply tons (minimum breaking force) by 8.896;
lIb
= 4.448 newtons (N).
**
Minimum breaking forces listed above apply to ropes with bright or drawn galvanized wires.
Minimum breaking forces are 10% lower for ropes
with wires galvanized at finish size.
94 • Wire Rope Technical Board - Wire Rope Users Manual, Fourth Edition
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