TABLE 28 MINIMUM BREAKING
FORCE
OF
WIRE
ROPE
6 x 25 B, 6 x 27 H & 6 x 30 G Flattened StrandJBright (Uncoated),
IWRC
Nominal Diameter Approximate Mass
Minimum Breaking Force*
Improved Extra Improved
Plow Steel**
Plow Steel**
inches
mm
Ib/ft
kg/m tons metric tonnes tons
metric tonnes
112
12.7 0.47
0.70
12.6 11.4 14
12.7
9/16 14.3
0.60
0.89
16.0
14.5
17.6
16.0
5/8 15.9 0.73 1.09
19.6 17.8 21.7
19.7
3/4
19.1
1.06
1.58
28.1
25.5
31
28.1
7/8 22.2
1.46
2.17
38.0 34.5
41.9
38.0
1 25.4 1.89 2.83
49.4 44.8 54.4
49.4
1-1/8 28.6
2.39 3.56 62.2
56.4 68.5
62.1
1-114
31.8 2.95 4.39
76.3 69.2
84.0 76.2
1-3/8 34.9 3.57
5.31
91.9
83.4
101
91.6
1-1/2 38.1 4.25
6.32
108
98
119
108
1-5/8 41.3
4.98
7.41 127
115
140 127
1-3/4
44.5 5.78
8.60 146 132
161
146
1-7/8 47.6
6.65
9.90
167
152 184 167
2
50.8 7.56
11.3 189
171
207 188
*
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
·103
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