Join two fishing lines with two passes through one shared loop.
Also known as Surgeon’s knot, Double surgeon’s join.
The surgeon’s join connects two fishing lines with a doubled overhand passage. Overlap the lines, form one opening, and take the paired ends through twice. One entire leader section has to pass through that opening, which matters when the free section is long or already carries tackle.
This is the fishing bend, not a surgeon’s binding knot tied around an object. Keep all four exiting parts under control while seating so both lines share the same two-pass route.
When to use it
Add tippet to a leader; join monofilament or fluorocarbon sections.
Keep in mind
One entire leader section passes through the loop. This is the fishing bend, not the surgical binding knot.
Check your knot
- Both lines go through the shared opening twice.
- The complete required leader section passes through.
- All four parts draw up evenly without one line escaping the turns.