Constrictor knot

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Constrictor knot (and Double Constrictor Knot)

The constrictor knot is an effective binding knots that can be difficult or impossible to untie once tightened. It is made similarly to a clove hitch but with one end passed under the other.


  • A constrictor knot can be used as a quick temporary whipping for a fraying rope. Tied around the end, it will keep the strands together while it is being whipped or spliced.
  • The know can be tied around the neck of a sack or bag.
  • It can used to hold items together for gluing.



  1. Make a turn around the pole and bring the working end back over the standing part.
  2. Continue around behind the pole.
  3. Pass the working end over the standing part and then under the riding turn and standing part, forming an overhand knot under a riding turn.
  4. Be sure the ends emerge between the two turns as shown. Pull firmly on the ends to tighten.


  • The Constrictor Knot fails when tied against a flat surface – it requires a curved surface for the binding turn to grip the Half Hitch.
  • This know can be very difficult or impossible to untie. Do not tie this around someone's arm or leg!

See also