Best Fly Fishing Knots: The Essential Six

The fly fishing system uses a chain of connections: backing → reel; backing → fly line; fly line → leader; leader → tippet; tippet → fly. Each connection requires a specific knot. Knowing six knots covers every situation you’ll encounter on the water.

The Fly Fishing Connection System

[REEL] → [BACKING] → [FLY LINE] → [LEADER] → [TIPPET] → [FLY]
         Arbor Knot   Nail Knot    Blood Knot  Imp. Clinch

The chain of connections from the reel outward. Each knot must be strong — the weakest link in the chain is the maximum strength of your entire system.

The Six Essential Fly Fishing Knots

1. Arbor Knot — Backing to Reel

Attaches the backing line to the reel’s arbor (spool center).

Steps:

1. Pass the line around the arbor
2. Tie an overhand knot in the tag end around the standing line
3. Tie an overhand knot in the very end of the tag end as a stop
4. Pull the standing line — the first knot cinches against the arbor; the stop knot prevents it from pulling through

The weakest knot in the system, but it doesn’t need to be strong — backing failure here means you’ve already lost the fight.

2. Nail Knot — Fly Line to Leader Butt

Attaches the thick end (butt) of a tapered leader to the tip of the fly line.

Steps:

1. Hold a narrow tube (cocktail straw, hollow needle, or nail knot tool) alongside the tip of the fly line
2. Lay the leader butt alongside the fly line (pointing in the same direction) and wrap the tag end of the leader tightly around both the fly line and the tube, 6–8 times working toward the line tip
3. Thread the tag end back through the tube
4. Remove the tube while holding the wraps in place
5. Wet and cinch by pulling simultaneously on the tag end and the standing leader

The nail knot creates a very slim, smooth connection. Most anglers today use loop-to-loop connections instead (faster, nearly as strong), but the nail knot is still the most elegant option.

3. Blood Knot — Leader to Tippet (or Tippet Splicing)

The standard connection for joining two pieces of monofilament of similar diameter.

Steps:

1. Overlap 4–5 inches of the two pieces pointing in opposite directions
2. Wrap one piece 5–6 times around the other
3. Bring the tag end back through the center gap between the two pieces
4. Repeat with the other piece in the opposite direction
5. Both tag ends should emerge through the same gap pointing in opposite directions
6. Wet, then pull both standing lines simultaneously while holding the center

Works best when the two lines are within 1–2 lb test of each other. Produces a slim, clean connection.

4. Double Surgeon’s Knot — Leader to Tippet (Quick Alternative)

Faster than the Blood Knot; slightly bulkier but nearly as strong. Handles connections between lines of different diameters better than the Blood Knot.

Steps:

1. Overlap 4–5 inches of the two lines
2. Tie an overhand knot (both strands together, as one)
3. Tie a second overhand knot in the same direction
4. Wet, pull all four ends simultaneously

Can be tied in 10 seconds with practice. The connection is slightly bigger than the Blood Knot but passes through guides adequately.

5. Improved Clinch Knot — Tippet to Fly

The most important knot in fly fishing — used every time you change flies.

Steps:

1. Thread 5–6 inches of tippet through the hook eye
2. Wrap the tag end 5–6 times around the standing line (5 wraps for 6X–4X; 4 wraps for 3X–0X)
3. Thread the tag end through the small loop near the hook eye
4. Thread the tag end back through the large loop just formed (the “extra tuck” that makes it “improved”)
5. Wet thoroughly, pull tight, trim tag end

Critical: Lubricate with saliva before cinching. A dry clinch knot on fluorocarbon is unreliable. See the full Improved Clinch Knot guide.

6. Perfection Loop — Leader Loop for Loop-to-Loop Connection

Creates a small, in-line loop at the end of a leader butt for loop-to-loop connections with the fly line’s tip loop.

Steps:

1. Form a loop in the tag end, crossing over the standing line
2. Form a second loop in front of the first, behind the standing line
3. Pass the second loop through the first loop from back to front
4. Tighten by pulling the second loop while holding the tag end

Produces an in-line loop (the loop extends straight from the line) that connects cleanly with the fly line tip loop.

Quick Reference Table

Related Guides

• Improved Clinch Knot
• Double Uni Knot
• How to Fly Fish for Trout
• Best Fly Patterns for Trout
• Fishing Line Types Explained