Uni Knot

Dubbed the “Uni” by a Miami Herald editor in the 1970s, its original name is Uni Knot. It is a multi-purpose fishing knot used for attaching a line to the arbor of a reel, joining two lines together (double Uni), and more. 

As an experienced fisherman or woman, you may also know it as the "Duncan Loop," or as the "Grinner Knot."

Whichever name you use does not really matter, as their meaning is the same.

It is one of the most popular knots, and some even say it is “the only knot you need” to apply while fishing. 

The Uni Knot is excellent for joining lines two lines together (a double uni, "doubled line"), and for attaching terminal tackle, i.e., lures, snaps, and swivels to the end of the line Uni is a secure and robust knot for tying all lines, like monofilament and fluorocarbon lines, to enjoy all your angling ventures.

But, like most anything, learning how to make a Uni Knot takes practice, and before long, you will become proficient at it.

How to Tie a Uni Knot

If you are new to fishing and want to tie a Uni Knot for the first time or practice becoming better at it, below are the steps you need.

Here are 6 easy to follow steps for Uni Knot tying:

  1. Run the line through the eye of the hook and double back equal with the standing line. This forms a circle.
  2. Make a loop by laying a tag end over the double line.
  3. Make 6 turns with the tag and ends around the double line and through the loop.
  4. Moisten the lines, then pull  tag  end to tighten up the turns.
  5. Move the knot down to the eye of the hook or swivel.
  6. Leave a small loop if needed.

All you need is a small amount of tippet to tie the Uni Knot, and it lengthens the life of your cuts, leaders, and on the use of your tippet.

Looking to make your fishing line or Uni Knot even stronger? The next step is to learn how to join two lines.

The Best Knots That Make a Fishing Line Stronger

If you already know how to tie a Uni Knot, but are looking to make an even stronger line, there are several knots you can use to link a fishing line to your main line. 

Some prefer to use the Blood Knot, while other anglers use the J Knot, as both keep most of the breaking strength in the fishing line. 

But among the best knots to make your fishing line stronger is the double Uni Knot. Considered by many to be one of the easiest knots to tie, its knot strength is just as reliable as many others. 

Double Uni Knot forms by joining two lines, particularly those of different diameter and material, into one secure connection. 

It is a great knot that helps when jerking on the line to provide a steady pressure without bending or twisting.

The break strength of the double Uni Knot is less than 100% but well over 90%. Using this helpful fishing tip  is how  you can raise the power to 100% by doubling both lines before joining the pair.


The Uni Knot is one of the top knots you need to learn as a fisherman or woman. It is a clean tie knot that does not demand a high-level difficulty to use.

Joshua Keaton
Joshua Keaton

Joshua is our senior staff writer for Fishing.org and Shooting.org. He is an avid hunter, clay shooter and amateur photographer.