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howsthebite · Knots · Double uni knot

How to tie the Double uni knot

Joins two lines — braid to a fluoro leader, or mono to mono.

medium MonoFluoroBraid Joining two lines

Also called: Uni to uni

Why this knot

It handles lines of different diameter and material, which is exactly the braid-to-leader case most anglers need.

Tie it

  1. 1 Overlap the two lines by about 8 inches, running in opposite directions.
  2. 2 With the first line, tie a uni knot around the second: fold back, form a loop, wrap through it five times.
  3. 3 Wet and snug that first uni, but leave it a couple of inches from the end.
  4. 4 Repeat with the second line around the first. Use six or seven wraps if that line is braid.
  5. 5 Wet both knots, then pull the standing lines apart so the two barrels slide together and lock.
  6. 6 Trim both tags close.

Getting it right

  • More wraps on the thinner or slicker line. Braid needs six or seven where mono needs five.
  • Pull the standing lines, never the tags, to bring the knots together.
  • If your leader is more than about twice the diameter of your main line, this knot gets bulky. Consider the FG knot.

What goes wrong

  • Equal wraps on both sides when one line is braid. The braid side slips.
  • Trimming before the barrels are locked together.

Knots that go with it

All 11 knots →