The Uni Knot is one of the easiest and most common knots used for fishing nowadays. It is a very versatile knot that can virtually be used in any application. It is a great choice for tying thick monofilament leaders to your hooks or swivels. It can have the line doubled up on itself for additional strength or even be used for line-to-line connections. We will cover the other variants of the Uni Knot at a later date. The knot has a breaking strength of above 90% of the breaking strength of the line and is capable of holding even when pressure is applied with a sudden jerk. Other knots often break around 50-60% breaking strength when a quick jerk is applied. With how easy of a knot this is I recommend every angler to know this knot by heart.
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Run the line through the eye of the hook and bring the tag end of the line back along the mainline.
Take the tag end of the line back towards the eye of the hook making a loop using the tag end of the line.
Run the tag end of the line through the loop you made, and wrap it around doubled line 5 to 6 times. The thicker the diameter of the line the fewer wraps are needed, and the thinner the line or if using braided line more wraps are needed. I recommend a minimum of 4 wraps and a max of 8 wraps.
Moisten the lines and then tighten up the knot by pulling the tag end up snug. Then slide the knot down to the eye of the hook or leave a small loop if you want. Trim the tag end of the line after snugging down the Uni knot leaving about 1/4″ left as a tag.