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Manila Rope - Strength

Manila 3-strand rope - minimum breaking strength and safe load

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Manila rope is made from the fibers of the abaca plant - "musa testilus" - Manila hemp.

Minimum breaking strength and safe load for manila ropes:

Rope DiameterMinimum Breaking StrengthSafe Load
(Safety Factor 12)
Weight
(in)(mm)(lbf)(kN)(lbf)(kN)(lbm/ft)(kg/m)
3/16 5 405 1.8 33.8 0.15 0.014 0.020
1/4 6 540 2.4 45.0 0.20 0.018 0.027
5/16 8 900 4.0 75.0 0.33 0.026 0.039
3/8 10 1212 5.4 101 0.45 0.038 0.056
7/16 11 1575 7.0 131 0.58 0.049 0.072
1/2 12 2385 10.6 199 0.88 0.070 0.104
9/16 14 3105 13.8 259 1.2 0.096 0.143
5/8 16 3960 17.6 330 1.5 0.127 0.189
3/4 18 4860 21.6 405 1.8 0.159 0.237
13/16 20 5850 26.0 488 2.2 0.186 0.277
7/8 22 6930 30.8 578 2.6 0.214 0.318
1 24 8100 36.0 675 3.0 0.257 0.382
1 1/16 26 9450 42.0 788 3.5 0.298 0.443
1 1/8 28 10800 48.0 900 4.0 0.343 0.510
1 1/4 30 12150 54.0 1010 4.5 0.397 0.591
1 3/8 32 13500 60.1 1130 5.0 0.456 0.679
1 1/2 36 16650 74.1 1390 6.2 0.570 0.848
1 5/8 40 20250 90.1 1690 7.5 0.711 1.06
1 3/4 44 23850 110 1990 8.8 0.850 1.26
2 48 27900 120 2330 10.4 1.02 1.52

Example - Maximum Safe Mass for a 3/8" Manila 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" manila rope where safe load is 0.45 kN can be calculated as

m = (0.45 103 N) / (9.81 m/s2)

   =  45.9 kg 

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