What is the purpose of a stopper knot in anchor systems?

• A. To decorate the rope.
• B. To shorten rope length.
• C. To prevent the rope from slipping through the anchor and add security.
• D. To increase rope friction.

Answer: (C)

A stopper knot on the end of a rope in an anchor system serves to create a physical end that cannot pass back through the anchor or hardware under load. When the rope is secured through anchors, pulleys, or carabiners, there’s a real risk that the free end could slip through if it isn’t blocked. Tying a stopper knot at the rope end stops that slip and adds security by keeping the rope in place and preventing an unexpected release or movement of the system. It also makes the end easy to locate and retrieve.

Decorative purposes, shortening the rope, or relying on friction alone are not the primary reasons for having a stopper knot. The main goal is to prevent passage of the rope through the anchor and to enhance overall safety.