Constrictor Knot
A clove hitch with one extra tuck that traps the crossing turn. The result grips like a hose clamp made of string — many consider it the best binding knot there is.
How to tie the Constrictor Knot
- Pass the working end around the object and cross over the standing part, as if beginning a Clove Hitch.
- Continue around the object a second time.
- Bring the working end over the standing part and then tuck it beneath the diagonal crossing strand created by the first pass.
- Pull both ends in opposite directions so the crossing strand traps the tucked end.
- Dress the two turns together and tighten progressively around the object.
How to inspect it
The Constrictor resembles a Clove Hitch with the working end trapped beneath the diagonal crossing. Both turns should lie together around the object, and the central tuck should be clearly visible rather than buried in a tangle.
Common mistakes
Missing the central tuck produces a Clove Hitch instead. Tightening around a fragile, compressible, or living object can cause damage, and a heavily loaded Constrictor may need to be cut off.
Rope and material notes
Small, firm cord concentrates pressure and makes a strong binding, while very stiff rope may not cinch closely. Slick synthetic cord can still creep if the binding is not fully dressed. Consider whether cutting the cord later will be safe.
Safety note: These steps support practice and recognition. Climbing, rescue, lifting, towing, and other critical systems require qualified instruction and equipment-specific procedures.
Which knot should you choose?
Choose a Constrictor Knot for a tight binding around a cylindrical object or bundle. Choose a Clove Hitch when adjustment and easy release matter more, and use purpose-built clamps where controlled pressure is required.
Why it earns its place
Once tightened on a convex surface it essentially will not budge. Perfect for whipping rope ends, sealing bags, clamping split hosepipe, or holding bundles for gluing.
Where it fails
Genuinely semi-permanent: tightened hard on soft material, the usual way off is a knife. Never use it where you'll need to untie, and never on anything it could crush.
Quick facts
| Type | Binding knot |
| Under load | Extreme grip |
| Untying | Often impossible |
| Best for | Permanent binding, whipping |
External reference
KnotStyle provides the selection advice, written practice sequence, inspection points, and cautions above. Use this independent animation as an additional visual reference.
View external animation ↗Source and editorial notes
Reference: Animated Knots by Grog: Constrictor Knot. Source checked 2026-09-30. Selection advice and difficulty ratings are editorial judgments, not strength tests. How this guide is prepared.