TABLE 24 MINIMUM BREAKING
FORCE
OF
WIRE
ROPE
6x36 Classification/Bright (Uncoated),
IWRC
Nominal Diameter
Approximate Mass Minimum Breaking Force*
Extra Extra
Improved Extra Improved Improved
Plow Steel**
Plow Steel** Plow
Steel**
inches
mm
lb/ft
kglm
ton
metric tonnes
tons
metric tOlmes 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
7/16 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 17.9 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
1-118
28.6
2.34
3.48
56.5
51.3
65.0 59.0
71.5
64.9
1-1/4 31.8 2.89 4.30
69.4 63.0
79.9
72.5 87.9
80.0
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
2-114 57.2
9.36 13.9 215 195 247 224 282 256
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
2-7/8 73.0 15.3
22.8 341
309 392 356 432
392
3 76.2 16.6 24.7
370 336 425 386
468 425
3-1/8 79.4
18.0
26.8 399 362 458 415 504 457
3-]/4
82.6 19.5
29.0
429
389
492
446
543
493
3-3/8 85.7
21.0
31.3 459 416
529
480
582
528
3-1/2 88.9 22.7
33.8 491
445
564
512 621 563
3-5/8
92.1 24.3
36.2 523
458
602 528 663
601
3-3/4 95.3 26.0
38.7
558
505 641 581 705 640
*
To convert to Kilonewtons (kN). multiply tons (minimum breaking force) by 8.896;
1 lb
==
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· 99
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