The surgeon's knot is a double overhand. It takes about five seconds, it works on any line, and it is the knot most guides tie when a client breaks off. It is not the strongest knot, but it is the fastest one you will ever rely on.
The whole thing takes one motion once you have it. That is its entire value: when you have just broken off a fish, speed matters more than three percent of strength.
| Surgeon’s knot | Double uni | |
|---|---|---|
| Speed to tie | 5 seconds | 30–45 seconds |
| Strength retention | Around 80–85% | Around 90% |
| Profile | Bulkier, catches in small guides | Slimmer, passes guides better |
| Best on | Any two lines, especially in a hurry | Braid to fluorocarbon leader |
| Easiest to learn | Very | Moderate |
Carry both. Surgeon's when you need to be fishing again in ten seconds, double uni when you want the strongest joint you can tie quickly.
Use three passes on braid. Slick braid will pull out of a two-pass surgeon's on a big fish. The third pass is cheap insurance.
Trim the tags short and even. A surgeon's knot is bulky already. Long tags make it catch in every guide on the cast.
Pull it slowly. Yanking an overhand distorts the coils and leaves you with a knot that looks fine and fails under load.
You will tie this knot hundreds of times a season. These are the things that make each one quick and clean.
Buy leader in small spools and replace it often. Fresh leader ties better knots than the line you have had on the shelf for two years.
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The surgeon knot trades a little strength for speed, which suits tippet changes. The blood knot is the stronger alternative, the knot strength calculator shows the gap, and the leader size chart sets the tippet size.
It typically retains about 80 to 85 percent of line strength. That is less than a double uni, but it is more than enough for most freshwater fishing and it is far faster to tie.
Two passes for mono to mono or mono to fluorocarbon. Three for anything involving braid, because braid is slick enough to pull out of a two-pass knot.
It works, and it is the fastest option. If you want a slimmer knot that passes guides more easily, use a double uni or an FG.
Yes. A surgeon's loop is the same structure tied as a loop and is a common way to make a quick dropper loop or a loop for a lure.
Usually because it was pulled dry or unevenly, so the two coils did not seat side by side. Wet it, pull slowly, and make sure the coils stack neatly before you trim.
Double uni knot · Knot strength chart · Best knots for braid · Non-slip loop knot · Knot strength calculator
How to Tie a Palomar Knot · How to Tie an Improved Clinch Knot · How to Tie a Uni Knot · How to Tie an FG Knot · How to Tie a Blood Knot · How to Tie a Double Uni Knot · How to Tie a Snell Knot · How to Tie a Non-Slip Loop Knot · How to Spool a Spinning Reel · Spooling Without Line Twist · How to Set Drag on a Reel
Numbers to go with it: Knot Strength Calculator · Line Diameter Converter · Shock Leader Calculator
Disclaimer: The numbers on this page are estimates based on published specifications and standard formulas. Real-world results vary with brand, gear condition and how the equipment is set up. TackleCalc is an independent reference site and is not affiliated with any manufacturer. Nothing here replaces the instructions that come with your own gear.