On which axis are carabiners strongest?

Carabiners are designed with specific loading strengths that vary based on how weight is applied to them. The major axis is the strongest because it is aligned with the spine of the carabiner, which is the thickest and most robust part of its structure. This alignment allows it to handle the highest load and resist bending forces effectively.

When weight is applied along the major axis, the design and material properties of the carabiner work in unison to maximize strength and durability. This includes the ability to distribute stress evenly, minimizing the risk of breaking or deforming under load.

In contrast, carabiners are significantly weaker along the short axis and minor axis due to the decreased resistance to bending and potential for cross-loading, which can lead to catastrophic failure. Understanding these loading strengths is crucial for safe climbing practices and effective rescue operations, where the integrity of equipment plays a vital role in the safety of the individual and team involved.