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LOCKING STYLES
Non-locking- Used in limited applications during rescue operations for non-life-safety
loads, which include securing edge protection and securing equipment to a harness or a
litter. Non-locking carabiners are constructed with a straight gate, bent gate or wire
gate. The majority of rescue carabiner nose designs incorporate a keylock or blind nose
design to reduce the chance of snagging rigging material on the gate opening

Screw Lock- features a threaded sleeve that must be manually screwed open or closed
in order to release the gate. They have fewer moving parts than spring-loaded

mechanisms, are less prone to malfunctioning due to contamination or component
fatigue. They are more time-consuming to operate than twist-lock.

Auto-Locking (Twist Lock)- Have a security sleeve which must be manually rotated to
disengage with a spring-loaded collar that automatically springs closed upon release.
Manufacturers offer some proprietary auto-locking design mechanisms including Petzl
Ball-Lock and Triact-Lock, ISC Supersafe and Quadlock, Omega Pacific Quik-Lok and
Rock Exotica ORCA 3-stage auto-locking system. It is important to recognize that dirt,
ice, or other contamination can inhibit the auto locking mechanism and prevent it from
functioning properly.

Magnetic Lock Magnetron by Black Diamond produced,
has two small levers with embedded magnets on either
side of the locking gate which must be pushed or
pinched simultaneously to disengage the gate (Figure
27). Upon release the levers pull shut and into the

locked position against a steel insert in the carabiner
nose. With the gate open the magnets in the two levers
repel each other so they do not lock or stick together,
which might prevent the gate from closing properly.

Figure 27- Black Diamond
Magnetron Rocklock. © Black
Diamond.

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