TABLE 22 MINIMUM BREAKING FORCE OF WIRE ROPE
6 x 19 ClassificationlBright (Uncoated), IWRC
Nominal Diameter Approximate Mass
Minimum
Breaking Force*
Improved
Extra Improved
Extra Extra
flmy
St~el**
Plow Steel**
Improved
Plow**
inches
mm
Ib/ft kg/m
tons
metric tonnes
tons
metric tonnes tons metric tonnes
114
6.4 0.12 0.17
2.94 2.67 3.40 3.08 3.74 3.39
5/16
7.9
0.18
0.27
4.58 4.16 5.27 4.78
5.80
5.26
3/8 9.5
0.26 0.39
6.56 5.95
7.55 6.85
8.30
7.53
7116
11.1 0.35
0.52
8.89 8.07 10.2 9.25 11.2 10.2
112
12.7
0.46
0.68 11.5
10.4 13.3
12.1 14.6
13.2
9/16 14.3 0.59
0.88
14.5 13.2 16.8 15.2 18.5
16.8
5/8 15.9
0.72
1.07 17.7 16.2 20.6 18.7
22.7
20.6
3/4
19.1
1.04
1.55 25.6 23.2 29.4 26.7
32.4
29.4
7/8 22.2 1.42
2.11 34.6 31.4 39.8 36.1 43.8 39.7
1
25.4
1.85 2.75 44.9
40.7 51.7 46.9 56.9 51.6
1-1/8
28.6 2.34
3.48 56.5 51.3
65.0 59.0 71.5 64.9
1-114
31.8 2.89
4.30 69.4 63.0 79.9 72.5
87.9 79.7
1-3/8
34.9
3.50
5.21
83.5
75.7 96.0 87.1 106
96.2
1-1/2
38.1
4.16
6.19 98.9 89.7 114 103 125 113
1-5/8 41.3 4.88
7.26 115 104
132
120
146
132
1-3/4 44.5
5.67
8.44 133 121 153 139 169 153
1-7/8
47.6
6.50
9.67 152
138 174
158 192 174
2
50.8 7.39
11.0 172
156 198
180 217 197
2-118
54.0 8.35 12.4
192 174 221
200 244 221
2-1/4 57.2 9.36
13.9 215
195 247
224
272 247
2-3/8
60.3
10.4 15.5
239 217 274 249
302
274
2-112
63.5 11.6
17.3 262 238
302
274
332
301
2-5/8
66.7 12.8
19.0 288
261 331
300
364
330
2-3/4 79.9 14.0
20.8
314
285 361 327 397
360
*
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·
97
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