Triple fisherman's knot
The triple fisherman's knot is a bend, used to join two ends of rope together. It is an extension of the double fisherman's knot and is recommended for tying slippery, stiff ultra-high-molecular-weight polyethylene (UHMWPE) and aramid kernmantle ropes.
Advantages
- Very strong knot.
- Works well for stiff and slippery synthetic ropes.
Disadvantages
- It is a jamming knot - makes it difficult to untie.
Tying
Tying the triple fisherman's knot is nearly identical to the double fisherman's knot, except for a third wrap before passing the end through each half of the knot.
Testing show that at very high loads the double fisherman's knot fails in ropes with UHMWPE and Technora cores. The sheath of the rope separates at the knot, and the high-lubricity core slips through the double fisherman's knot. Although the increase in ultimate strength is small, the triple fisherman's knot does not slip. This has led to the recommendation to use the triple fisherman's knot to avoid this particular failure mechanism.