Nylon Ropes - Strengths
Nylon 3-strand and 8-strand rope - minimum breaking strength and safe load.
Nylon rope is made from continuous filament polyamide - nylon 6 or nylon 6.6.
Minimum breaking strength and safe load for nylon rope:
| Rope Diameter | Minimum Breaking Strength | Safe Load (Safety Factor 12) | Weight | ||||
|---|---|---|---|---|---|---|---|
| (in) | (mm) | (lbf) | (kN) | (lbf) | (kN) | (lbm/ft) | (kg/m) |
| 3/16 | 5 | 880 | 3.91 | 73.3 | 0.326 | 0.009 | 0.013 |
| 1/4 | 6 | 1486 | 6.61 | 124 | 0.551 | 0.016 | 0.023 |
| 5/16 | 8 | 2295 | 10.2 | 191 | 0.851 | 0.025 | 0.036 |
| 3/8 | 10 | 3240 | 14.4 | 270 | 1.20 | 0.036 | 0.053 |
| 7/16 | 11 | 4320 | 19.2 | 360 | 1.60 | 0.048 | 0.071 |
| 1/2 | 12 | 5670 | 25.2 | 473 | 2.10 | 0.063 | 0.094 |
| 9/16 | 14 | 7200 | 32.0 | 600 | 2.67 | 0.080 | 0.119 |
| 5/8 | 16 | 8910 | 39.6 | 743 | 3.30 | 0.099 | 0.147 |
| 3/4 | 18 | 12780 | 56.8 | 1070 | 4.76 | 0.143 | 0.213 |
| 7/8 | 22 | 17280 | 76.9 | 1440 | 6.41 | 0.195 | 0.290 |
| 1 | 24 | 22230 | 98.9 | 1850 | 8.23 | 0.253 | 0.377 |
| 1 1/16 | 26 | 25200 | 112 | 2100 | 9.34 | 0.287 | 0.427 |
| 1 1/8 | 28 | 28260 | 126 | 2360 | 10.5 | 0.322 | 0.479 |
| 1 1/4 | 30 | 34830 | 155 | 2900 | 12.9 | 0.397 | 0.591 |
| 1 3/8 | 32 | 38250 | 170 | 3190 | 14.2 | 0.437 | 0.650 |
| 1 1/2 | 36 | 48600 | 216 | 4050 | 18.0 | 0.570 | 0.848 |
| 1 5/8 | 40 | 57375 | 255 | 4780 | 21.3 | 0.673 | 1.00 |
| 1 3/4 | 44 | 66150 | 294 | 5510 | 24.5 | 0.780 | 1.16 |
| 2 | 48 | 84600 | 376 | 7050 | 31.4 | 1.00 | 1.49 |
Example - Maximum Safe Mass for a 3/8" Nylon 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" nylon rope where safe load is 1.2 kN can be calculated as
m = (1.2×103 N) / (9.81 m/s2)
= 122 kg
