Surgeon’s Loop
Double overhand on a bight — fastest reliable fixed loop.
Beginner · Monofilament / Fluorocarbon
Connection card
Surgeon’s Loop
For line → loop (fixed end loop), loop → loop.
This card does not say how strong the knot is. A retention figure comes from a bench, in one material, at one diameter, tied by somebody who ties it all day — and the line in your hand is none of those. What it does tell you is whether the thing you have just tied is the thing the record describes.
What this plate is telling you
Double overhand on a bight — fastest reliable fixed loop.
Save this as a picture and it works with a dead signal and a nearly dead battery, which is when a joint is most often tied badly. The rest of this page — the steps, the seating sequence, the failure modes and the bench — is for the evening before.
Before you start
- ·Fold back a bight a little longer than the loop you want. The knot and the loop both come out of this doubled line.
- ·Set the loop size while the knot is still loose. It stays that size once the knot closes.
- ·Two passes make the knot. Animated Knots notes a third pass adds little and makes the knot bulkier.
- ·Easiest in mono and usable in fluorocarbon. It is a bulky loop, and other knots usually suit braid better.
Step 1 of 5. Fold the end of the line back on itself to make a bight a little longer than the loop you want.
No drawing of this exact knot yet. The written steps are the reference.
swipe to step
01
Fold the end of the line back on itself to make a bight a little longer than the loop you want.
A doubled section of line with the bight at one end and the tag lying beside the standing line.
Making the bight too short. You find out in step 2, when there is not enough doubled line to tie the overhand and still leave a usable loop.
Fix: Unfold it and double more line. The spare tag is trimmed off at the end.
Why: The doubled line is tied as if it were a single strand, so both the knot and the loop come out of this length.
arrow keys work
Tying procedure — Surgeon’s Loop
- Diagram in reviewA drawing of the Surgeon’s Loop itself is being made. Until then, follow the written steps.
Step 01 / 5
Fold the end of the line back on itself to make a bight a little longer than the loop you want.
You should now see: A doubled section of line with the bight at one end and the tag lying beside the standing line.
If it goes wrong: Making the bight too short. You find out in step 2, when there is not enough doubled line to tie the overhand and still leave a usable loop.
Fix: Unfold it and double more line. The spare tag is trimmed off at the end.
Why: The doubled line is tied as if it were a single strand, so both the knot and the loop come out of this length.
- Diagram in reviewA drawing of the Surgeon’s Loop itself is being made. Until then, follow the written steps.
Step 02 / 5
Tie an overhand knot in the doubled line, then pass the bight through the same overhand a second time.
You should now see: A loose knot showing two turns of doubled line around each other, the bight sticking out one side and the standing line and tag out the other.
If it goes wrong: Making only one pass, or letting the two strands of the double twist over each other. You see a single crossing, or strands that swap sides inside the knot.
Fix: Back the bight out, lay the two strands flat side by side, and make both passes again.
Why: Two passes make it a surgeon's loop, a double overhand tied in doubled line. Animated Knots notes that a third pass adds little and makes the knot bulkier.
If wrong: Single pass only — not a Surgeon's loop — May slip and the eye walks.
If wrong: Messy multi-pass body — Weaker eye, bulk that ticks.
- Diagram in reviewA drawing of the Surgeon’s Loop itself is being made. Until then, follow the written steps.
Step 03 / 5
Slide the knot along the doubled line until the loop is the size you want.
You should now see: A loop of the size you need, with the loose knot sitting where you want it on the doubled line.
If it goes wrong: Leaving the loop size until after the knot starts to close. Once it tightens, the loop cannot be changed.
Fix: If the knot has started to close on a loop of the wrong size, loosen it with a fingernail and slide it before it sets.
Why: Loop size can only be changed while the knot is loose. Once it closes, the loop stays that size.
If wrong: Passes not completed through the loop — Unreliable — the eye never locked.
- Diagram in reviewA drawing of the Surgeon’s Loop itself is being made. Until then, follow the written steps.
Step 04 / 5
Wet the knot, then pull the loop against the standing line and tag held together until the knot closes.
You should now see: A tight, rounded knot with the loop on one side, the standing line and tag on the other, and no turns sitting loose.
If it goes wrong: Pulling only the standing line so the tag side stays loose. The knot looks lumpy and closes unevenly.
Fix: Wet the knot again and pull the loop against the standing line and tag together.
Why: Animated Knots says to lubricate and pull tight without naming which parts to pull; pulling the loop against both strands of the double closes it evenly.
- Diagram in reviewA drawing of the Surgeon’s Loop itself is being made. Until then, follow the written steps.
Step 05 / 5
Trim the tag close to the knot.
You should now see: A short tag end and a closed knot that does not move when you pull on the loop.
If it goes wrong: Trimming before the knot is fully closed. The tag can pull back inside the knot.
Fix: If the tag is already cut and the knot is loose, cut the loop off and tie it again.
Why: Trim last, after the knot has closed under a firm pull.
Watch the tie
How to tie a Surgeon's Loop KnotTake Me Fishing · Opens on YouTubeExternal video from a creator we follow — not produced by us. Nothing on this page loads from YouTube until you follow the link.
Seating sequence — where failures are born
The step list compresses the finish. Run these phases in order, one at a time.
01 Moisten
Wet the structure before any load reaches it.
Zero. Nothing tightens yet.
02 Load
Take up slack slowly until the wraps begin to gather.
Light and even — both ends moving together.
03 Dress
Watch the wraps stack in order; stop and back off if any cross.
Hold, do not pull. Correction happens here or not at all.
04 Set
One continuous pull to full seat — no sawing, no jerks.
Firm, single direction, standing line against the terminal end.
05 Trim
Cut the tag square, leaving a short stub proud of the knot.
None. Never trim under load.
Finished structure — what correct looks like
No drawing of this exact knot yet. The written steps are the reference.
- ·Fixed loop from double overhand on bight
- ·Fully seated multi-pass
- ·N/A or short depending on method
- ·Double overhand body
Verify before you load it
Every line is pass or fail. One fail means retie — do not load a knot you argued with.
- 01Fixed loop from double overhand on bight
- 02Fully seated multi-pass
- 03N/A or short depending on method
- 04Double overhand body
- 05Expected multi-pass form
- 06Surgeon loop
Field notes — dark, cold, gloves
- ·Retie by feel first, light second — the seat is a tactile event, not a visual one.
- ·Gloves off for the dress phase. Fabric hides a crossing wrap.
- ·Wrong twice in a row means the material or the hardware is fighting you. Change one, not your technique.
Surgeon’s Loop — finished-state checks, on the shared reference layout
When this family fails, it fails as these. The recovered end still outranks the name.
A loop that stays the size you made, with a return that cannot cinch.
- !Loop cinched around the hardware — action is dead
- !Return path reversed, so it becomes a slip loop
- !Fluoro in a lock that only behaves on mono
- !Seated on the standing line alone, leaving the tag side loose so the tag pulls back inside
- !Tag trimmed before the knot fully closed, leaving it loose
- !Strands of the double crossed over each other inside the knot
- !Loop changes size under a test pull, showing the knot has not seated
Single pass only — not a Surgeon's loop
May slip and the eye walks
Double pass is the minimum; one pass is an overhand loop · step 02
Messy multi-pass body
Weaker eye, bulk that ticks
Clean passes keep the lump compact and load-bearing · step 02
Passes not completed through the loop
Unreliable — the eye never locked
Every pass must go through the loop before the seat · step 03
Too bulky for small guides or keepers
Check
- ?Compare to Perfection Loop size
Then
- →Use Perfection Loop
- →Drop to double surgeon
Finished check failed — Single overhand only
Check
- ?Double overhand completed on the doubled line
- ?Loop size stable after draw
- ?Tags exit cleanly
Then
- →Retie. Incomplete double overhand fails as a fixed loop.
Single pass only — not a Surgeon's loop
Check
- ?May slip and the eye walks
- ?Inspect step 02
Then
- →Retie. Do not dress a defective structure and call it seated.
Messy multi-pass body
Check
- ?Weaker eye, bulk that ticks
- ?Inspect step 02
Then
- →Retie. Do not dress a defective structure and call it seated.
Passes not completed through the loop
Check
- ?Unreliable — the eye never locked
- ?Inspect step 03
Then
- →Retie. Do not dress a defective structure and call it seated.
Same failure class, different geometry. Open the plates — Diagnose still starts from the symptom.
Get it right with everything in your favour0/5 clean
Good light, dry hands, a table. Until the sequence is automatic here there is nothing for the harder rungs to test — you would only be learning that difficult conditions are difficult, which you already knew.
How · Tie it, check it against the list, log it. Five clean and the ladder opens.
Nothing marked. Log it clean, or mark what happened first.
Not ideal for
- ×When the absolute smallest loop knot is required
- ×Very fine tippet where the double-overhand bulk matters
Strength, and where the number comes from
Not established
No published break test, and the percentage would in any case need to say whether it is of the doubled loop or of the single line it is formed from — no source we read makes that distinction.
Percentages come from published tests on their own line, their own knot-tyer and their own pull rate. Yours is a different system. Treat a figure as a reason to test, not as a result you already have.
- Animated Knots — Surgeon’s Loop
- FishingKnots.com Knot Strength Database
Recovered from this record’s historical modelSourceId registry.
Record reviewed 2026-08-09
Vetted references
- Surgeon’s Loop
Animated Knots by Grog
- How to tie a Surgeon's Loop Knot
Take Me Fishing
Check the finished knot against what correct looks like before you load it.