Double uni knot
Also called Uni-to-uni knot, Double uni, Uni knot to uni knot
A line-to-line knot made by tying two uni knots back-to-back and snugging them together. It’s commonly used to join leader to tippet, or mono to fluorocarbon.
- Group
- Line-to-line knots
- Category
- Knots & rigging
- Level
- Intermediate
- Water
- Fresh & salt
Last updated
What Double uni knot means
Two uni knots get tied facing each other, one with each line. After both sides are formed, the standing lines pull the two knots together until they seat as a single connection.
Most anglers use it for leader-to-tippet connections, especially when the two materials are different, like nylon leader to fluorocarbon tippet.
It’s a bulkier connection than a blood knot, but it’s straightforward to tie and it works with lines that are hard to match in diameter. Trim the tags close once it’s seated.
Why it matters on the water
Knowing the double uni gives a reliable option when a blood knot is frustrating, usually because the two diameters are too different or the material is stiff. That comes up often when stepping down to fine tippet, or when adding fluorocarbon to a nylon leader.
It also helps with troubleshooting. If the knot slips, the usual fix is more wraps on the thinner line and careful tightening so both uni knots seat cleanly before they draw together.
Read next
- Blood knotA blood knot is a line-to-line knot used to join two pieces of similar-diameter mono or fluorocarbon, most often leader to tippet.
- LeaderThe leader is the clear, tapered line between the fly line and the fly. It turns the fly over and gives you a clean, controlled presentation.
- TippetTippet is the thin, level line tied to the end of your leader. It’s the section you cut back and replace as you change flies and re-tie knots.
- Uni knotA Uni knot is a sliding, multi-wrap knot used to join two lines or to form a loop. Tied as a “double uni,” it’s a common way to connect leader sections and tippet.