TABLE 30 MINIMUM BREAKING FORCE OF WIRE ROPE
8 x 19 Classification/Rotation Resistant/Bright (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
10.1
9.16 11.6
10.5
9/16
14.3
0.60
0.89
12.8 11.6
14.7
13.3
5/8 15.9
0.73
1.09
15.7 14.2 18.1 16.4
3/4 19.1
1.06 1.58
22.5
20.4 25.9
23.5
7/8 22.2 1.44 2.14
30.5 27.7 35.0 31.8
1
25.4
1.88
2.80 39.6 35.9 45.5 41.3
1-1/8 28.6
2.39 3.56 49.8 45.2
57.3
51.7
1-114
31.8 2.94 4.37
61.3 55.6
70.5 64.0
1-3/8 34.9 3.56
5.30 73.8 67.0 84.9 77.0
1-112
38.1
4.24
6.31
87.3
79.2
100. 90.7
The minimum breaking forces for 8 x
19
rotation resistant ropes are applicable only when a test is conducted on a
new rope that is fixed at both ends. When the rope
is
in use, and one end
is
free to rotate, the breaking force is
reduced.
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·
105
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