Anchor Bend
Friction on hardware · Physical hitch theory
Does not pick a knot
This page does not pick a knot for you. DNA, molecules, quantum braids and vortices stay off Decide.
Finished structure
Drawn from a rope model of this knot: which strand passes over which comes from where the rope actually lies.
When this family fails, it fails as these. The recovered end still outranks the name.
A hitch that cinches to the ring or shackle and is not meant to break by hand.
- !Second turn tied outside — two half hitches, not a jam
- !Expected to untie after a snatch
- !HMPE without a splice — the hitch strips the cover
- !The end is tucked under only one turn, and the knot eases open under a pulsing load
- !Only one pass went through the ring, so the knot is plain half hitches with no turns clamping the end
- !The half hitch is missing or loose, and the tucked end works back out of the turns as the rode swings
- !The tail was left unseized on a rode that stays down, and over weeks of soaking and swinging the hitch loosens unseen
Single pass, no round turn
Hitch slips on the ring in a swell
The round turn is the hitch · step 01
Working end missed a turn
Tuck does not lock and the rode walks
The working end must pass through both turns · step 02
Unseized standing job
Soak and swell work the tail loose
A rode that lives underwater gets seized or taped · step 04
Hitch works loose after a soak
Check
- ?Working end through both turns
- ?Half hitch dressed
Then
- →Seize the tail
- →Retie wet
Single pass, no round turn
Check
- ?Hitch slips on the ring in a swell
- ?Inspect step 01
Then
- →Retie. Do not dress a defective structure and call it seated.
Working end missed a turn
Check
- ?Tuck does not lock and the rode walks
- ?Inspect step 02
Then
- →Retie. Do not dress a defective structure and call it seated.
Unseized standing job
Check
- ?Soak and swell work the tail loose
- ?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.
What holds it
- ·A hitch is object-dependent. Remove the spar, cleat, ring or pile and the structure is usually the unknot.
- ·Bayman / Maddocks–Keller describe a no-slip regime from wrap count and friction. The prediction is approximate, and only for hitches.
What topology does not predict
- ·Closed-loop knot invariants (Jones, Alexander) do not say whether a clove hitch will walk on a smooth spar.
- ·No manufacturer working load is implied by wrap count.
- ·Wet, iced, or HMPE covers change friction — topology is silent.
Not for
- ·Joining two free rope ends — that is a bend
- ·A standing loop that must survive after the object is gone
- ·A job you must undo every five minutes
- ·Slick HMPE without a seizing
Same pattern, different job
No sourced twin among these knots. Related knots stay on the Library card.
- Crowell — The physics of knots (Bayman / Maddocks–Keller) — Bayman 1977 hitch theory; Maddocks & Keller 1987 extension. No equally good general theory for all knots.
- Sano et al. — Inner workings of the clove hitch (Extreme Mechanics Letters, 2022) — Elastic rod on a rigid cylinder. Empirical hitch mechanics.
- Knot — practical vs mathematical (Wikipedia) — Closed-curve knot theory ignores friction. Practical knots are classified by function.
- Animated Knots — Anchor Bend
- Hook the Horizon — The Anchor Bend
- AnimatedKnots — How to Tie an Anchor Hitch Knot — Cited tying video already attached to this record.