Testing knot strength means tying your braid-to-fluorocarbon connection exactly the way you fish it, then pulling it to failure on a scale that records peak poundage, so you know with confidence which knot is stronger before you ever hook a fish. In this How 2 Tuesday I put the Slim Beauty against the Double Uni, 20-pound Daiwa J-Braid to 50-pound fluorocarbon, the same combo I use for tarpon. The only way to truly know your best knot is to compare it on a scale, tied your way, with your gloves and your materials. I break each one twice and take the average, because in fishing we control the controllable.
Listen now: press play in the player above and follow along.
In my test, the Double Uni came out a little stronger. Tying 20-pound Daiwa J-Braid to 50-pound fluorocarbon, the Slim Beauty broke at 18.81 and 20.56 pounds, while the Double Uni broke at 19.28 and 21.52 pounds. It was close, but the Double Uni won on both pulls. So for that exact line combination, the way I tie it, I would opt for the Double Uni to land as many fish as possible. Your results could differ with other materials, which is why you should test your own.
You tie the knot the way you actually fish it, put a loop over a scale, wrap the line around a gloved hand, and pull steadily until it breaks. The best tool is one that records peak poundage, like the NexTech force tester I use, so it captures the breaking strength even after the line lets go. You can also use a regular digital scale with a friend calling out the number as you pull. Tie a couple of each knot and average the results or watch for an anomaly.
Because your knot is only as strong as the way you personally tie it, with your line, your leader, and your gloves. Someone else might tie a given knot stronger or weaker than you do. If you test with the exact braid, fluorocarbon, and technique you will use on the boat, you replicate real conditions and learn which knot is strongest in your hands. Experimenting with new materials at home does not tell you what will happen when it counts, so test what you fish.
I used 20-pound Daiwa J-Braid x8, in the light blue color, tied to 50-pound J-Fluoro fluorocarbon leader. That 20-to-50 braid-to-fluorocarbon combination is a very common setup for tarpon and a lot of other fishing, which is exactly why I chose it. I used the same materials for both knots so the only variable was the knot itself, and I wore a glove to safely wrap the line for each pull.
Because that one pound can be the margin between landing a fish and breaking off. It could decide whether you or your client loses the fish of the trip, or whether you win the tournament or not. In fishing we try to control the controllable, and the best captains control every factor they can. Knots are one of the most controllable, because you can test them at home before you ever leave the dock and know with confidence which one is stronger.
Any scale that can measure the pull will work, but one that records the peak is better. A basic digital scale or even a Chatillon-style scale works if a friend watches and calls out the number as the line breaks. The advantage of a peak-recording force tester like the NexTech is that it freezes the highest poundage on the screen, so you do not have to catch the exact reading at the instant of failure. Either way, the key is tying and breaking each knot a couple of times.
The whole point of a knot test is to learn what happens in your hands, not someone else's. I tie with specific line, a specific leader, and a glove, and I replicate that exactly so the result means something on the boat. There are knots someone else ties stronger than I do, and that is fine. What matters is which knot I tie strongest with the gear I use. I explain how I set up a fair test in the episode, so press play in the player above.
So much in fishing is out of our hands, the weather, the fish, the other boats. Knots are the opposite. You can test them at home, before you even get on the water, and know with total confidence that one is stronger than another. That one pound can be the difference between landing a fish and watching it swim off with your fly. I get into why the best captains obsess over the controllable factors in the episode, so press play in the player above.
Here is exactly how I ran the Slim Beauty versus Double Uni test, and how you can test your own knots at home.
I unpack each of these with the details and stories in the episode. Press play in the player above.
The day after this one, the lesson is the same one I keep returning to: confidence comes from testing. The Double Uni beat the Slim Beauty by about a pound in my hands, and now I tie it knowing, not guessing, that it is stronger for this combo.
Try it yourself with your own line, leader, and gloves. Tie a couple, break them on a scale, and let the numbers decide. And if you have a knot you think is the strongest, text it to me and we will throw it on the scale, because I think a knot battle over the next few How 2 Tuesdays would be a lot of fun.
How 2 Tuesday is my weekly series where I break down one fishing skill at a time, from knots and casting to gear, tactics, and the habits that make you a better angler. Watch and listen to every How 2 Tuesday episode from Tom Rowland.
Slim Beauty knot · Double Uni knot · Bimini twist · Daiwa J-Braid x8 · J-Fluoro fluorocarbon · NexTech force tester · tarpon · braid to fluorocarbon · knot strength · How 2 Tuesday · Saltwater Experience
I'm Tom Rowland, a professional fishing guide based in the Florida Keys, host of the Tom Rowland Podcast, and the longtime host of the Saltwater Experience television show. On the podcast's How 2 Tuesday series I break down one practical skill or lesson at a time, from fishing technique and gear to the habits that make you a better angler, in short, focused episodes you can put to use right away.
Subscribe to get the latest episodes, show notes, and exclusive content delivered straight to your inbox.