Obviously it is vitally important that the lanyard assembly and the harness are connected together, and remain so. Often connection is made by a double-locking snap-hook; however some of the available snaphooks can be easily disconnected from the harness by twisting the gate of the hook against the harness D-ring, while applying gentle pressure on the safety latch, thereby causing “roll-out” of the snap-hook from the D-ring.
Because most common connectors, including various types of karabiners and snap-hooks, can in some conceivable circumstances be disconnected from a harness, we supply Maillons Rapides, also called screw-links, quick-links, or tube-nut connectors, as standard fittings on the harness end of our lanyards. At the anchorage end of a lanyard there is less chance of roll-out because the anchor eyes are usually too small, or may be flexible (eg webbing slings).
The snap-hooks supplied on Aspiring lanyards are a forged steel type and pass our simple “table test” for snap-hook safety, which can be applied to all snap-hooks having the safety latch on the back of the snap-hook opposite the gate and parallel, so that the gate can be opened by squeezing the gate and the latch towards each other. The snap-hook is placed on its back on a table under downward pressure, and then pressure is applied to the gate. If the gate opens (because the latch is already depressed), the snap-hook fails the test. Such a snap-hook has a greater chance of roll-out from a D-ring.
Karabiners, which are a D-shaped ring with a spring gate, are also used as connectors. These come with screw-locking, twist-locking, or triple-locking mechanisms. Triple-lock karabiners require the least care in use and are the safest option, provided the locking mechanism operates properly. However this type of mechanism is prone to failure. If the sleeve does not close properly they must be discarded. Twist-lock karabiners are used for anchor connections, but should not be used at the harness end of a lanyard. Screw-lock karabiners require care to ensure that the screw sleeve on the gate remains screwed up.