Sailing knots: the eight to know and when to use them

You don't need dozens of knots to sail a yacht. A handful, tied quickly and correctly, covers almost every job on board. Here they are, with what each one is for and where it can let you down.

The eight to know

KnotUse it forWorth knowing
BowlineA fixed loop: tying a sheet to the clew of a sail, a loop to drop over a bollard or post, a loop round a person.Won't slip or jam, and unties easily even after a heavy load. Can shake loose when unloaded and flogging.
Clove hitchA quick, temporary hitch to a rail, post or ring: hanging fenders, holding a line for a moment.Can slip or roll off if the load changes direction. Not for anything that matters for long.
Round turn and two half hitchesSecuring a line to a ring, post or rail under load: mooring lines, a dinghy painter.The round turn takes the strain while you tie the hitches, so you can tie and untie it under load.
Figure of eightA stopper knot in the end of a sheet or halyard, so it can't run out through a block or fairlead.Easy to untie, unlike a simple overhand knot, which can jam tight.
Reef knotTying the two ends of the same line together round something: reefing ties round a furled sail, a sail tie.Not for joining two separate ropes, especially under load, as it can capsize and slip.
Sheet bendJoining two ropes, including ropes of different thickness.A double sheet bend, with an extra turn, is more secure, especially in slippery modern rope.
Rolling hitchGripping another rope or a spar against a pull along its length: taking the load off a jammed sheet or a riding turn on a winch.Tie it with the turns on the side the load comes from.
Cleat hitchMaking a line fast to a cleat.A turn round the base, a couple of figure-of-eight turns over the horns, then a locking turn. Too many turns only make it harder to release.

Choosing the right knot

  • Need a loop? Bowline.
  • Tying to something? Round turn and two half hitches for anything under load; clove hitch only for quick, light, temporary jobs.
  • Joining two ropes? Sheet bend, doubled if it matters.
  • Stopping a rope running out? Figure of eight.
  • Taking the load off another rope? Rolling hitch.

Knots and the exam

The Yachtmaster examiner won't usually test knots on their own, but you'll tie them throughout the exam: mooring lines, fenders, reefing and anchoring. Fumbling a bowline in front of the examiner doesn't inspire confidence. For how to use them alongside, see mooring lines and springs.

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Questions

What is the most useful sailing knot?

The bowline. It makes a fixed loop that won't slip or jam, so it's used for tying sheets to a sail, making a loop to drop over a bollard and many other jobs, and it's easy to untie after it's been loaded.

Which knot joins two ropes together?

A sheet bend, which works even with ropes of different thickness. Use a double sheet bend for more security. A reef knot is only for tying the two ends of the same rope, such as reefing ties.

Which knot can you tie and untie under load?

A round turn and two half hitches. The round turn takes the strain while you tie the half hitches, which makes it ideal for securing a line to a ring, post or rail.

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Last checked 5 November 2026. DeckPrep is an independent revision tool and is not affiliated with, endorsed by, or operated by the RYA. Always check current requirements with the RYA.