Carabiner Strength Ratings, Demystified (No Math Degree Required)
kN in one minute
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kN = kilonewtons. 1 kN ≈ 224.81 lbf (pounds-force).
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So 25 kN ≈ 5,620 lbf. 12 kN ≈ 2,698 lbf. Big numbers—but context matters.
The three numbers that matter
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Major-axis strength (gate closed): the headline rating on the spine.
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Minor-axis strength: when cross-loaded. Usually much lower.
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Open-gate strength: also lower; dynamic loads + open gate = trouble.
Why a high major-axis number isn’t a free pass
Real use is messy: ropes shift, devices twist, and people get tired. That’s why lockers exist and why technique matters more than spec sheet flexing.
Let's have an example:
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Auto-Lock D, 25kN (major), with typical minor/open-gate numbers in the single digits; it’s UIAA/EN certified and built for high-consequence links.
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Wire-Gate D, 12kN: stout for gear, camp, EDC, racking. Not for life support.
Practical takeaways
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Load along the spine; avoid cross-loading.
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Keep the gate closed; with lockers, keep it locked.
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Respect open-gate and minor-axis ratings—they’re there for a reason.
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Replace after major shock, visible deformation, cracks, or deep grooves.
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