Surgeon's Loop Knot

Loop knot Beginner

Surgeon's Loop Knot

A fast, strong loop knot that creates a doubled loop in seconds. Used to create loop-to-loop connections on leader butts and tippets — the quickest way to add a loop to any length of line.

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About the Surgeon's Loop Knot

The Surgeon's Loop Knot creates a strong, reliable loop at the end of any line using the same principle as the Surgeon's Join Knot — a doubled overhand knot, but with the line doubled on itself instead of joining two separate pieces.

It's the fastest way to add a loop to the end of a leader, tippet, or mainline for loop-to-loop connections. While it's not as perfectly in-line as the Perfection Loop, it's much faster to tie and delivers equivalent practical strength for most applications.

Best Used For

Ideal applications
  • ✓ Quick loop-to-loop leader connections
  • ✓ Adding loops to leader sections in the field
  • ✓ Beginner anglers needing a fast, reliable loop
Not ideal for
  • ✗ Applications requiring a perfectly in-line loop (use Perfection Loop)
  • ✗ Braided line

Step-by-Step Instructions

Follow these 4 steps to tie the Surgeon's Loop Knot. Watch the video above while following along.

Step 1: Double the line

Fold about 6 inches of line back on itself to form a doubled loop.

Step 2: Form a loop with the doubled section

Create a loop with the doubled section of line.

Step 3: Pass through twice

Pass the doubled loop through the large loop twice (double overhand with the doubled line).

Step 4: Wet and tighten

Wet the knot. Pull the loop and both standing line strands simultaneously to seat. Trim any remaining tag end.

Pro Tips

  • Two passes through the loop (double) significantly increases strength
  • Pull the loop and standing line simultaneously — not just one
  • Loop size is set by how much line you double over — decide before tying

Common Mistakes

  • Only one pass through the loop (weaker single surgeon's loop)
  • Not pulling the loop when tightening — knot seats unevenly
  • Too small a doubled section — loop will be too small to be useful

Frequently Asked Questions

The Surgeon's Loop Knot is recommended for Mono, Fluoro. A fast, strong loop knot that creates a doubled loop in seconds. Used to create loop-to-loop connections on leader butts and tippets — the quickest way to add a loop to any length of line.

The Surgeon's Loop Knot retains approximately 95% of the line's breaking strength when tied correctly. Always wet the knot before tightening to maintain maximum strength.

An experienced angler can tie the Surgeon's Loop Knot in about 20 sec. Beginners may take longer at first, but with practice you'll be tying it without thinking.

The Surgeon's Loop Knot is rated as a beginner-friendly knot — easy to learn and reliable for new anglers.

The Surgeon's Loop Knot is ideal for: Quick loop-to-loop leader connections, Adding loops to leader sections in the field, Beginner anglers needing a fast, reliable loop. See the full guide for more applications.

Both serve similar purposes but differ in technique and ideal applications. See the Surgeon's Loop Knot guide and the Perfection Loop Knot guide to compare strength, speed, and ideal line types.

Related Knots

Perfection Loop Knot
View guide
Non-Slip Mono Knot
View guide
Dropper Loop Knot
View guide
Free Guide
Includes video tutorial
Strength: 95% · compare
Tying time: 20 sec
Level: Beginner
Type: Loop knot
Steps: 4
Watch on YouTube Browse All Knots
Best line: Mono, Fluoro

Quick Reference

Step 1 Double the line
Step 2 Form a loop with the doubled section
Step 3 Pass through twice
Step 4 Wet and tighten