Petzl William Ball-Lock

Meet the Petzl William Ball-Lock carabiner, a locking carabiner built for all kinds of climbing—from sport pitches to indoor walls and alpine routes. It’s designed to give you a reliable connection point on your harness, rope, or gear anchor without frills or fuss.

Its ball-lock auto-locking gate adds an extra layer of security by minimizing the chance of accidental openings, while the 27 mm gate clearance makes clipping and unclipping smoother during busy crags or in cold conditions. Crafted entirely from aluminum, this carabiner stays light—around 105 g—so it won’t weigh down your rack, and its slim profile tucks neatly against your gear loop.

The William Ball-Lock boasts a major-axis strength of 27 kN, meaning it can withstand roughly 2,750 kg of force along its spine, and offers 8 kN on the minor axis and with the gate open. These ratings, tested to CE EN 12275 standards, give you a clear picture of how the carabiner behaves under load and ensure it meets recognized safety benchmarks.