Autolock Carabiners for Tree Climbing

Buying guide

Why auto-locking matters

In tree work you clip and unclip constantly, often while holding a saw or reaching around a limb. A screw gate can be left open by accident; an auto-locking carabiner cannot. ANSI Z133 calls for self-closing, self-locking connectors with at least two actions to open in life-support use. Pick a shape that suits the job, like an offset D for general use or an oval for pulleys, and check the gate operates cleanly with gloves. Inspect before every climb and retire any carabiner that does not lock fully.

Choosing the right model

Aluminum autolock carabiners like the DMM Shadow and Petzl Am'D are light enough to carry several on your saddle. Steel models handle wear better at high-friction spots. Look at gate opening for clipping thick rope, a keylock nose so it does not snag, and whether the shape works with your friction device or pulley. Locking carabiners for climbing should be checked for smooth gate action before every use, cleaned of sap and grit, and retired if the gate sticks or fails to lock on its own.