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Rope Diameter

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Suggested diameter for mooring lines

The table below shows the guidelines for the diameters of mooring lines. Mooring ropes made of polypropylene are weaker and need therefore be thicker than the polyester or polyamide ropes. If you have a boat that is significantly heavier than average, make sure to chose a thicker diameter mooring line as well. 

Boat Length

Rope material 

Polyester and Polyamide

Polypropylene

8 m ; 26ft

10 mm

14 mm

10 m  ;  33ft

12 mm

16 mm

12 m  ;  39ft

14 mm

18 mm

14 m  ;  46ft

16mm

20 mm

16 m  ;  53ft

18 mm

22 mm

19 m  ;  62ft

20 mm

24 mm

Mooring lines 8-20 mm are delivered from stock.

 

Suggested diameter for sheets and halyards 

The guidelines for the diameter of sheets and halyards with a polyester core are shown in the table below. Yachting ropes with high-performance fibers, such as Dyneema® fibers, Vectran or Stirotex® core allow for approximately 2 mm smaller diameters. Make sure to splice your rope, because a knot reduces the strenght with approximately 50% and your rope may not have the required breaking strength in that case.

Typically the diameter of sheets and halyards has to fit in with the clutches, cleats and blocks on board. It's best to chose a rope that is 1-2 mm thinner than the maximum diameter of a block.

Check out our selection of sheets and halyards

Yacht

Length

Sheets diameter in mm

Halyards diameter in mm

Main

Genoa

Spinnaker

Main

Genoa

Spinnaker

6-8 m  ; 20-26 ft

10 mm

10 mm

10 mm

8 mm

8 mm

8 mm

9 m ; 30 ft

10 mm

12 mm

10 mm

10 mm

10 mm

8 mm

10 m ; 33 ft

12 mm

14 mm

10 mm

10 mm

10 mm

10 mm

11 m  ; 36 ft

12 mm

14 mm

12 mm

10 mm

12 mm

10 mm

12 m  ; 40 ft

12 mm

14 mm

12 mm

12 mm

12 mm

12 mm

14 m ; 46 ft

14 mm

14 mm

12 mm

12 mm

12 mm

12 mm

16 m ; 53 ft

14 mm

14 mm

14 mm

12 mm

14 mm

12 mm

18 m  ;  59 ft

14 mm

14 mm

14 mm

14 mm

14 mm

14 mm


For competitive sailors it is important to optimize the breaking load with weight savings of a rope. We are happy to work with you on that challenge!