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# Wire Ropes - Strengths

Minimum breaking strength and safe load for Bright wire, uncoated, fiber core (FC) wire rope, improved plow steel (IPS):

Wire Ropes - Strengths
(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

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