Wire Rope - Strength

Wire rope 6-strand x 19 wire (6 x 19) - weight - minimum breaking strength and safe load

steel wire rope strength

Minimum breaking strength and safe load of Bright wire, uncoated, fiber core (FC) wire rope, improved plow steel (IPS) are indicated below.

Rope DiameterMinimum Breaking StrengthSafe LoadWeight
(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 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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