The double fisherman’s knot is a knot used to join two lengths of rope.
A primary use of this knot is to form high strength loops of cord for connecting pieces of a climber’s protection system.
Another common use for this knot is to back up a critical knot, such as a harness tie-in knot or single-line rappel rigs.
In this use, the running end is tied around the standing end of the rope, so that it cannot slip back through the knot.
This bend provides more security than the Fisherman’s Knot.
Double Fisherman’s knot, Grapevine, Double englishman’s knot.
1. Lay the ends of two lines parallel to each other.
2. Coil the free end of one rope twice around the second rope and pass it back through the inside of the coils.
3. Repeat with second rope in opposite direction.
4. Pull free ends to tighten knots, the knots slide together.