Manila Ropes - Strength
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 Diameter | Minimum Breaking Strength | Safe 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 |
Download and print Manilla Rope Safe Load Chart
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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