Bends & Joining Knots
Reliably join two lines — whether of equal or different diameters, under moderate or high load.
The Sheet Bend and Double Sheet Bend
The sheet bend is the fundamental knot for joining two lines of different diameters. The name comes from its original purpose: bending a sheet onto a sail. Unlike the reef knot, it remains secure when loaded asymmetrically and works across a wide range of size mismatches.
Tying it: Form a bight in the thicker (or stiffer) line. Pass the working end of the thinner line up through the bight, around behind both legs of the bight, then under its own standing part (not under the bight legs). Pull to dress and set.
Double sheet bend: For slippery lines or large diameter mismatches, take an extra turn of the thinner line around the bight before tucking under itself. The double sheet bend is significantly more secure on synthetic lines.
Failure mode: If the thinner line wraps around only one leg of the bight rather than both, the result is a slip-sheet bend that releases under load. Always ensure the working end wraps around the full bight.
When joining very different diameters — say, 8mm to 14mm — or when using slippery braided lines, always use a double sheet bend. The single can work loose on modern synthetic sheets.
In a sheet bend, the bight should be formed in which line?
The Carrick Bend
The carrick bend is the strongest knot for joining two heavy lines of similar diameter — especially useful for large-diameter anchor rodes, tow lines, or any situation where a sheet bend would jam or be difficult to untie after loading.
The carrick bend has an open, symmetric weave when tied but tightens into a compact, stable shape under load. Its key advantage over the sheet bend in heavy lines is that it can still be untied after sustained heavy loading — a property valued when joining anchor rodes that may need to be disconnected in a hurry.
Tying it: Form a loop with the first line, crossing over itself. Lay the second line under the tail of the first loop, weave it over-under-over through the first loop following the alternating pattern, then bring its working end under itself. The resulting knot should show a symmetric interlaced pattern before setting.
When loaded, the carrick bend deforms into a tighter configuration. Some riggers leave it in the open (un-set) form when they need to release it quickly.
The carrick bend is excellent for joining two anchor chains or heavy rodes temporarily. Mark one of the working ends with tape before loading — it becomes very difficult to see which end is which in the set form, and you'll need to know when you untie it.
What is the primary advantage of a carrick bend over a sheet bend for heavy rodes?
The Rolling Hitch
The rolling hitch attaches a line to another line or spar and holds under load parallel to the standing object — a property that most hitches lack. It's the knot for taking load off a jammed sheet: attach a secondary line with a rolling hitch, take load on the secondary line, clear the jam, then re-load the original.
Tying it on a spar: Wrap the working end around the spar twice in the direction of load. Then take a third wrap, crossing over the previous two wraps. Bring the working end back under itself and pull toward the direction the load will come from. The key is that the third wrap crosses over the first two.
Tying it on a line: Identical technique, but on a running line rather than a spar. The rolling hitch grips through friction — the harder you pull in the direction of load, the tighter it grips.
Use case: A sheet has jammed in a winch or clutch under full sail load. You cannot ease the sheet conventionally. Attach a secondary line with a rolling hitch behind the jam, lead it to another winch or cleat, take load on the new line until the jam releases, then resolve the original problem.
The rolling hitch only grips when loaded in the direction of the initial wraps. Test it under gentle load before committing — if it slides, the direction is wrong or the wraps didn't cross properly.
What unique property makes the rolling hitch useful for relieving a jammed sheet?
The Alpine Butterfly — Loop and Bend
The Alpine butterfly forms a fixed loop in the middle of a line without access to either end. It's used in sailing when a line has a damaged section mid-length (tie a butterfly around the damage to take it out of the load path), when a temporary attachment point is needed mid-line, or when creating bridle systems.
Tying it: Wrap the line twice around your hand to form two loops. Bring the front loop over and behind the back loop, then pull it back under to complete the knot. It takes practice but becomes quick once muscle memory sets in.
Alpine butterfly bend: Use the same geometry to join two line ends — the result is a secure, symmetric bend that holds well under high and shock loads, and remains relatively easy to untie. It outperforms the reef knot and matches the sheet bend for security.
The butterfly is favored in offshore and racing sailing for connecting halyard tails to lines when sections have been chafed — isolating the damaged section without cutting and re-splicing.
If you sail offshore, the alpine butterfly is worth the practice time. Being able to isolate a chafed section mid-halyard could save a rig at sea when you have no means to make a splice.
Why would a sailor tie an Alpine butterfly in the middle of a halyard?
Summary
The sheet bend joins two lines of different diameters; use the double sheet bend for slippery or very mismatched lines.
The carrick bend excels for heavy rodes and can be untied after heavy loading — use it for anchor rode or tow line connections.
The rolling hitch grips under parallel load — the right tool for taking load off a jammed sheet or halyard.
The Alpine butterfly creates a secure mid-line loop for isolating damaged sections or rigging bridles.
Key Terms
- Sheet bend
- A bend that joins two lines, especially of different diameters, by threading the thinner line through and around a bight in the thicker
- Carrick bend
- An interlaced symmetric bend suited for heavy lines that remain releasable after loading
- Rolling hitch
- A hitch that grips under load parallel to the object it's tied to — used for relieving jammed lines
- Alpine butterfly
- A knot that forms a secure loop in the middle of a line without access to either end
Bends & Joining Knots Quiz
You need to join an 8mm sheet to a 14mm mooring line quickly. Which bend is most appropriate?
A jib sheet has jammed in a clutch under full sail pressure. You cannot ease it directly. What do you do?
A halyard has a chafed section 2 meters from the shackle end. What knot allows you to isolate that section?
Why is the carrick bend preferred over the sheet bend for joining two heavy anchor rodes?
In which direction does a rolling hitch grip?
References & Resources
Related Links
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Animated Knots — Sheet Bend
Animated guide to tying single and double sheet bends
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Animated Knots — Rolling Hitch
Step-by-step rolling hitch on a spar or line