Jack’s Knot
Compact crossing lock for fly tippet. Inspect the centered crossing before you fish it.
Intermediate · Monofilament / Fluorocarbon
Connection card
Jack’s Knot
For line → hook.
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
Compact crossing lock for fly tippet. Inspect the centered crossing before you fish it.
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
- ·Pull plenty of tag through the eye. It has to form a loop, wrap the double line and come back up through that loop.
- ·The loop is a single turn. Adding a second turn twists it so it will not lie flat across the double line.
- ·Draw the knot tight up the line first, then slide it down to the eye. It is not closed against the eye.
Step 1 of 4. Run the tippet up through the hook eye, then bring the tag back down alongside the standing line so the two lie parallel.
No drawing of this exact knot yet. The written steps are the reference.
swipe to step
01
Run the tippet up through the hook eye, then bring the tag back down alongside the standing line so the two lie parallel.
The tag lying back along the standing line to form a double line below the eye, with plenty of tag left to loop and wrap.
Leaving a short tag. It runs out partway through the wrap and cannot reach back up through the loop.
Fix: Pull more tippet through the eye before forming the loop.
Why: The tag has to form a loop, wrap the double line and come back up through that loop, so it needs to reach well past the double.
arrow keys work
Tying procedure — Jack’s Knot
- Diagram in reviewA drawing of the Jack’s Knot itself is being made. Until then, follow the written steps.
Step 01 / 4
Run the tippet up through the hook eye, then bring the tag back down alongside the standing line so the two lie parallel.
You should now see: The tag lying back along the standing line to form a double line below the eye, with plenty of tag left to loop and wrap.
If it goes wrong: Leaving a short tag. It runs out partway through the wrap and cannot reach back up through the loop.
Fix: Pull more tippet through the eye before forming the loop.
Why: The tag has to form a loop, wrap the double line and come back up through that loop, so it needs to reach well past the double.
- Diagram in reviewA drawing of the Jack’s Knot itself is being made. Until then, follow the written steps.
Step 02 / 4
Form a loop with the tag above the doubled line, then take the tag behind the doubled line so it finishes below it.
You should now see: One open loop of tag lying across the doubled line, with the tag passing behind the double and hanging below it.
If it goes wrong: Taking the tag in front of the doubled line instead of behind it, or adding a second turn. The loop twists and does not lie flat across the double.
Fix: Undo the loop and form it again with the tag above the double, passing behind it and ending below.
Why: This single loop is what the tag comes back up through in step 3. Its crossing has to run behind the double for that last pass to lock it.
If wrong: Reversed crossing — Compact knot twists to one side and slips.
- Diagram in reviewA drawing of the Jack’s Knot itself is being made. Until then, follow the written steps.
Step 03 / 4
Working back toward the fly, pass the tag in front of the doubled line and then behind it, then bring it up through the loop you made in step 2.
You should now see: The tag wrapped once around the doubled line below the loop and coming up through that loop, with the loop still open.
If it goes wrong: Passing the tag behind first and then in front, or down through the loop instead of up. The tag runs the wrong way and the knot will not draw into a neat shape.
Fix: Back the tag out of the loop and wrap it again, in front first and then behind, before bringing it up through the loop.
Why: Passing in front, then behind, then up through the loop traps the tag under its own wrap. NetKnots splits this into two steps.
If wrong: Will not seat — wrong side of the crossing — Opens under load.
- Diagram in reviewA drawing of the Jack’s Knot itself is being made. Until then, follow the written steps.
Step 04 / 4
Wet the lines and pull the knot tight first, then slide it down to the hook eye. Trim the tag close to the knot.
You should now see: A small, compact knot sitting against the hook eye, centred on the line, with the tag cut short.
If it goes wrong: Pushing the knot down to the eye while it is still loose, instead of tightening it first. It bunches against the eye and closes out of shape.
Fix: If the knot has closed twisted or out of shape, cut it off and tie it again, tightening it fully before sliding it to the eye.
Why: Drawing the knot tight up the line lets the wraps close evenly. Sliding the finished knot down then seats it against the eye without disturbing them.
If wrong: Tag exits the wrong side, or used on braid — Not this knot — braid will not hold this hitch.
Watch the tie
Jack's Knot - Easiest Fishing Knot Tying InstructionsInTheRiffle · 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.
- ·Terminal wrap or lock at the eye or along the shank
- ·Fully seated to eye or shank
- ·Tag exits clean and short
- ·Even structure, no crossings
Verify before you load it
Every line is pass or fail. One fail means retie — do not load a knot you argued with.
- 01Terminal wrap or lock at the eye or along the shank
- 02Fully seated to eye or shank
- 03Tag exits clean and short
- 04Even structure, no crossings
- 05None
- 06jacks
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.
Jack’s Knot — finished-state checks, on the shared reference layout
When this family fails, it fails as these. The recovered end still outranks the name.
A compact hitch or jam at the eye — fewer wraps, a different lock than a clinch barrel.
- !Lock never jammed to the eye — it is a loose hitch in disguise
- !Used on a small eye that cannot take the bulk of the jam
- !Confused with a clinch: the tag path is not a barrel tuck
- !Loop crossing runs in front of the double line, so the last pass does not lock it
- !Tag passed down through the loop instead of up, so the knot does not draw into shape
- !Pushed to the eye while still loose, so it bunches and closes out of shape
Reversed crossing
Compact knot twists to one side and slips
Jack’s is a specific crossing, not a random hitch · step 02
Will not seat — wrong side of the crossing
Opens under load
Seat only after the crossing is the Jack’s crossing · step 03
Tag exits the wrong side, or used on braid
Not this knot — braid will not hold this hitch
Tag exit side is the lock; braid is the wrong fibre · step 04
Compact crossing twists to one side or slips
Check
- ?Crossing centered on the standing tippet
Then
- →Retie slowly
- →Step to Orvis or Davy if the crossing will not stay centered
Finished check failed — Stopped mid-sequence
Check
- ?Full sequence completed
- ?Compact seat
- ?Tag controlled
Then
- →Retie. An incomplete Jack's Knot is unreliable on the first fish.
Reversed crossing
Check
- ?Compact knot twists to one side and slips
- ?Inspect step 02
Then
- →Retie. Do not dress a defective structure and call it seated.
Will not seat — wrong side of the crossing
Check
- ?Opens under load
- ?Inspect step 03
Then
- →Retie. Do not dress a defective structure and call it seated.
Tag exits the wrong side, or used on braid
Check
- ?Not this knot — braid will not hold this hitch
- ?Inspect step 04
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
- ×Braid
- ×Heavy conventional tackle
- ×Anyone who inspects Davy/Orvis more reliably
Strength, and where the number comes from
Not established
Its inventor claims a '100% knot' and NetKnots prints that claim while calling it 'debatable', which is a disagreement rather than a figure.
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.
- NetKnots — Jack's Knot
- Hook the Horizon — Jack’s Knot
Recovered from the same record’s historical Hook the Horizon resource URL.
- NetKnots fishing knot references
Recovered from this record’s historical modelSourceId registry.
Record reviewed 2026-08-14
Vetted references
- Jack’s Knot
Hook the Horizon
- Jack's Knot - Easiest Fishing Knot Tying Instructions
InTheRiffle
Check the finished knot against what correct looks like before you load it.