2 min read · Updated 27 June 2026
Cleats and clutches are the fittings that hold a rope once you've trimmed it — so the crew can let go without the line running out. They come in a range from simple cleats for light lines to strong rope clutches that hold and release heavily loaded halyards under load. Together with blocks and winches, they complete a boat's control systems.
Cleats — holding lighter lines
A cleat grips a line so you can stop pulling. The common types:
- Horn cleat — the traditional T-shape with two horns; the rope is figure-eighted around them and locked with a hitch. Simple and strong, used for mooring lines and halyards on smaller boats.
- Cam cleat — two spring-loaded, toothed cams the rope is pulled down between. They grip harder as the load rises, and release when you pull the line up and out. Quick to use, so they suit sheets and control lines adjusted often.
- Clam cleat — two fixed, ribbed jaws shaped like an open clam; the rope wedges into the V and grips by friction, with no moving parts. Light, cheap and reliable for lighter lines.
Clutches — holding high loads
A rope clutch (or jammer) is the strong option for heavily loaded lines like halyards. Inside is a spring-loaded toothed cam:
- With the lever down, the cam clamps the rope and holds the load — but the line can still be winched in through it, and cannot run back out.
- Lifting the lever releases the grip, even under full load.
This is what lets one winch serve several lines: tension a halyard on the winch, close the clutch to hold it, take the line off the winch, and use the same winch for the next line. It is central to a tidy, efficient deck layout.
Cleat or clutch?
- Lighter, frequently adjusted lines (sheets, control lines) → a cleat, usually a cam cleat.
- Heavily loaded lines you must release under load (halyards, reefing lines) → a clutch.
Between them, they hold everything the crew trims — and knowing them, along with a few knots, is basic boat literacy. For the vocabulary, see the sailing terms glossary.
Frequently asked questions
- What is a cleat on a sailing boat?
- A cleat is a fitting that holds a rope fast once it has been pulled to the right tension, so the crew can let go without the line running out. Cleats range from the traditional horn cleat, where the rope is figure-eighted around two horns, to spring-loaded cam cleats and ribbed clam cleats that grip a line instantly and release it with a flick. They are how a sailor 'parks' a trimmed line.
- What is a cam cleat?
- A cam cleat has two spring-loaded, toothed cams that the rope is pulled down between. The cams grip the line and hold it under tension, and the harder the load, the tighter they bite. To release, the sailor pulls the line up and out of the cams. Cam cleats are quick to engage and release, which makes them popular for sheets and control lines that are adjusted often.
- What is the difference between a cleat and a clutch?
- A cleat grips a line by pinching or turning it and suits lighter, frequently adjusted lines. A rope clutch (or jammer) is a stronger fitting with a toothed cam that clamps a heavily loaded line, holds it, and — crucially — can be released under full load by lifting a lever. Clutches are used for halyards and high-load lines so a single winch can tension one line, lock it off in the clutch, and move on to the next.
- How does a rope clutch work?
- A rope clutch has a spring-loaded toothed cam inside a housing. When the lever is down, the cam clamps the rope and holds the load; the line can still be winched in through it, but cannot run back out. Lifting the lever releases the grip, even under load. This lets a crew tension a halyard on the winch, close the clutch to hold it, take the line off the winch, and use the same winch for another line.
- What is a clam cleat?
- A clam cleat is a simple cleat with two fixed, ribbed jaws shaped like an open clam. The rope is pulled down into the V between the ribs, which grip it with friction — there are no moving parts. Clam cleats are light, cheap and reliable for lighter control lines, though they are less positive than a cam cleat under very high or shock loads and the line is released by lifting it up and out.