Wire Ropes - Strengths
6 strand x 19 wire (6x19) - minimum breaking strength, safe loads and weight.
Minimum breaking strength and safe load for Bright wire, uncoated, fiber core (FC) wire rope, improved plow steel (IPS):
| Rope Diameter | Minimum Breaking Strength | Safe Load | Weight | ||||
|---|---|---|---|---|---|---|---|
| (in) | (mm) | (lbf) | (kN) | (lbf) | (kN) | (lbm/ft) | (kg/m) |
| 1/4 | 6.4 | 5480 | 24,4 | 1100 | 4.89 | 0.11 | 0.16 |
| 5/16 | 8 | 8520 | 37,9 | 1700 | 7.56 | 0.16 | 0.24 |
| 3/8 | 9.5 | 12200 | 54,3 | 2440 | 10.9 | 0.24 | 0.36 |
| 7/16 | 11.5 | 16540 | 73,6 | 3310 | 14.7 | 0.32 | 0.48 |
| 1/2 | 13 | 21400 | 95,2 | 4280 | 19.0 | 0.42 | 0.63 |
| 9/16 | 14.5 | 27000 | 120 | 5400 | 24.0 | 0.53 | 0.79 |
| 5/8 | 16 | 33400 | 149 | 6680 | 29.7 | 0.66 | 0.98 |
| 3/4 | 19 | 47600 | 212 | 9520 | 42.3 | 0.95 | 1.41 |
| 7/8 | 22 | 64400 | 286 | 12900 | 57.4 | 1.29 | 1.92 |
| 1 | 26 | 83600 | 372 | 16700 | 74.3 | 1.68 | 2.50 |
| 1 1/8 | 29 | 105200 | 468 | 21000 | 93.4 | 2.13 | 3.17 |
| 1 1/4 | 32 | 129200 | 575 | 25800 | 115 | 2.63 | 3.91 |
| 1 3/8 | 35 | 155400 | 691 | 31100 | 138 | 3.18 | 4.73 |
| 1 1/2 | 38 | 184000 | 818 | 36800 | 164 | 3.78 | 5.63 |
| 1 5/8 | 42 | 214000 | 852 | 42800 | 190 | 4.44 | 6.61 |
| 1 3/4 | 45 | 248000 | 1100 | 49600 | 221 | 5.15 | 7.66 |
| 1 7/8 | 48 | 282000 | 1250 | 56400 | 251 | 5.91 | 8.80 |
| 2 | 52 | 320000 | 1420 | 64000 | 285 | 6.72 | 10.0 |
Example - Maximum Safe Mass for a 3/8" Wire Rope
The relationship between mass and force (weight) can be expressed as
m = F / g (1)
where
F = force, weight (N)
m = mass (kg)
g = acceleration of gravity (9.81 m/s2)
Maximum safe mass for a 3/8" wire rope where the safe load is 10.9 kN can be calculated as
m = (10.9×103 N) / (9.81 m/s2)
= 1111 kg
