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How to Tie a Double Fisherman's Knot
The double fisherman's knot joins two rope ends in a permanent, extremely strong connection — the standard for making Prusik loops and joining rappel ropes.
How to Tie a Double Fisherman's Knot Step by Step
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Written Instructions — Double Fisherman's Knot
- Overlap two lines Overlap both lines by 8 inches, tag ends pointing opposite directions.
- Double overhand on Line A With Line A's tag, tie a double overhand (two wraps) around Line B. Leave loose.
- Double overhand on Line B Mirror exactly: double overhand with Line B's tag around Line A, in opposite direction.
- Slide knots together Pull main lines apart. The two knots slide toward each other and interlock.
- Inspect You should see two X-patterns — one from each double overhand. Both sides symmetrical.
Tips for Tying a Double Fisherman's Knot
- The most important check: both double overhands must mirror each other exactly — same number of wraps, opposite directions.
- Once loaded heavily the double fisherman's is nearly impossible to untie — use it only for permanent connections.
- For making Prusik loops: join cord ends with double fisherman's, then dress the knot carefully before use.
- The double fisherman's will hold even if one knot fails — the two interlocked knots back each other up.
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