TABLE 26 MINIMUM BREAKING FORCE OF WIRE ROPE
6 x
91
Classification/Bright (Uncoated), IWRC
Nominal Diameter Approximate Mass
Minimum
Breaking Force*
Improved Extra Improved
Plow Steel**
Plow
Steel**
inches
mm
lb/ft
kg/m
tons metric tonnes tons
metric tonnes
4 101.6 29.6 44.1 589 534 677
614
4-1/4
108.0
33.3 49.6 660
599 759 689
4-112
114.3 37.4
55.7 734 666 844
766
4-3/4
120.7 41.7 62.1 810 735 932 846
5 127.0 46.2 68.7
891
808 1024 929
5-114
133.4
49.8
74.1
974
884 1120 1016
5-112
139.7 54.5
81.1
1060 962 1219 1106
5-3/4
146.1 59.6 88.7
1148
1041 1320 1198
6 152.4
65.0
96.7
1240
1125 1426 1294
*
To convert to Kilonewtons (kN), multiply tons (minimum breaking force) by 8.896;
1
Ib
= 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 ·101
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