TABLE 20 MINIMUM BREAKING FORCE OF WIRE ROPE
6 x 7 Classification/Bright (Uncoated), IWRC
Nominal Diameter Approximate Mass
Minimum Breaking Force*
Improved
Plow Steel**
inches
mm
lb/ft kg/m
tons metric tonnes
114
6.4
0.10
0.15
2.84 2.58
5/16 7.9
0.16 0.24 4.41 4.00
3/8 9.5
0.23
0.34
6.30
5.72
7116
11.1 0.32 0.48 8.52 7.73
112
12.7 0.42 0.63
11.1
10.1
9/16
14.3
0.53 0.79 14.0 12.7
5/8
15.9
0.65
0.97
17.1 15.5
3/4
19.1
0.92 1.37
24.4
22.1
7/8 22.2
1.27
1.89
33.0
29.9
25.4 1.65 2.46 42.7 38.7
1-118
28.6 2.09 3.11 53.5
48.5
1-114
31.8 2.57 3.82
65.6
59.5
1-3/8 34.9
3.12 4.64
78.6 71.3
1-112
38.1 3.72 5.54 92.7
84.1
*
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.
Wire Rope Technical Board - Wire Rope Users Manual, Fourth
Edition'
95
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