BREAKING STRENGTH 8 MM NYLON BRAIDED 12.07 kN — higher than expected
Five tensile strength measurements on braided nylon without core. The result came in more than 100 kg above expectation — and made quite an impact.
8 mm braided nylon without core breaks at an average of 12.07 kN (1,230 kg) — measured across five tensile tests on a universal testing machine.
Nylon without core — a hollow braid, not a solid construction — is generally underestimated.
This 8 mm braided nylon performed noticeably better than expected, and produced a very distinct sound at every break point.
Across five measurements, breaking strength ranged from 11.86 kN to 12.29 kN — a spread of just 0.43 kN.
For a rope without core, that is remarkably consistent. The pre-test expectation was approximately 1,110 kg; the average of 1,230 kg exceeded that by more than 100 kg.
At every break point, the characteristic nylon behaviour was both visible and audible: significant elongation followed by a loud snap.
The material8 mm nylon braided rope without core — material and construction
This rope is made from nylon (polyamide) and has a braided construction without a separate core.
All tensile load is therefore carried by the braided sheath itself. Of all synthetic fibres, nylon has the highest elongation at break — typically 20–35% — which provides direct shock absorption.
The trade-off: nylon loses 10–15% of its tensile strength when wet. For dry applications this is not a factor, but it is relevant for safety calculations in or near water.
This rope is part of our Nylon rope collection.
The methodTest method
The tensile tests were conducted on a universal testing machine with rope-specific clamps.
Test speed was 20 mm/s, in accordance with ISO 2307 for ropes with a diameter below 12 mm.
No pre-tension was applied — removing slack is not considered sufficiently standardisable in this test setup.
Free length between clamps was not recorded separately.
The total number of repetitions was 5.
Enormous snap at the break point and significant elongation — surprisingly strong for a rope without core. Expected 1,110 kg, but the average came in more than 100 kg higher.— from the test notes
The figuresResults
The five measurements ranged from 11.86 kN to 12.29 kN, with an average of 12.07 kN (1,230 kg).
The spread of 0.43 kN indicates a homogeneous construction — the braid delivers consistent resistance across all tests, even without a core as a load carrier.
In all five tensile tests, nylon characteristics were clearly present: visible elongation before the break point and a loud snap at failure.
This behaviour is inherent to the material.
Where dynamic loading, shock absorption, or elongation is not a drawback but an advantage — mooring lines, tow ropes, and dynamic tension applications — this behaviour is a benefit.
For applications requiring minimal elongation, nylon is not the right choice.
In perspectiveComparison with other 8 mm ropes
The values below were measured under identical test conditions on the same universal testing machine.
The comparison provides an indication of relative strength — not certified MBL values.
The 8 mm braided nylon scores highest of the four ropes compared. It achieves 12.07 kN versus 10.57 kN for polypropylene (+14%) and 10.17 kN for polyester kernmantel with twisted core (+19%).
The polyester kernmantel 32-strand braided came in lowest at 9.38 kN — a difference of nearly 2.7 kN (275 kg) compared to this nylon.
The fact that the rope without core is the strongest of the group is the most notable finding from this test series.
In practiceWhen to use this rope — and when not to
The combination of high breaking strength and significant elongation makes this rope suitable for specific applications. That elongation is also its main limitation for other uses.
✓ Suitable for
- Mooring lines and berthing — elongation absorbs shock loads from tidal movement and wave action without transferring peak forces directly to the bollard or vessel.
- Tow ropes — dynamic loading as a tow line comes under tension is dampened by nylon elongation, reducing peak load.
- Guy lines and tensioning lines — suitable where limited movement is acceptable and shock resistance is desirable.
- Temporary securing and lifting assistance (non-certified) — with a safety factor of at least 5:1, the measured breaking strength of 12.07 kN allows loads up to approximately 245 kg in non-certified environments.
✕ Not suitable for
- Low-elongation applications — for sheet lines, halyards, or control lines, nylon is unsuitable; elongation compromises precision and response.
- Certified lifting and life-safety — this test does not replace a certified MBL determination; use only certified rope for regulated applications.
- Prolonged wet use — nylon loses 10–15% of its tensile strength when wet; calculate safety factors based on wet strength.
- Static long-term loading at elevated temperature — nylon creeps under sustained high load at elevated temperatures; not suitable as a permanent load-bearing structure.
Stronger, at 8mmAlternatives to 8 mm nylon braided
ConclusionStrong, extensible and consistent
8 mm braided nylon without core breaks at an average of 12.07 kN (1,230 kg) — measured across five tensile tests.
That is higher than expected and higher than all 8 mm comparison ropes in this test set.
The spread of 0.43 kN indicates a reliable construction.
The best application area is wherever dynamic loading, shock absorption, or elongation is not a limitation but an advantage: mooring lines, tow ropes, guy lines, and berthing applications.
Where low elongation, certified lifting, or alternating wet-dry loading is required, polyester braided or HMPE is the better choice.
Otto Tromm conducted the tests, noted the snap, and concluded that a rope without core apparently knows exactly how to break. He now keeps his hearing protection next to the universal testing machine.