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Line By Diameter

Shop Sailboat Line by Diameter: 1mm - 12mm Line

West Coast Sailing carries over 80 different lines from 6 of the best rope manufacturers in diameters ranging from 1mm all the way up to 12mm. Use our handy category filters to narrow in on the specific diameter of lines that work for your application, and then pick the one that meets your exact criteria for performance, color, or price.


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  • 6mm Marlow Excel Racing

    6mm Marlow Excel Racing

    Marlow Ropes
    $1.60
    Marlow Excel Racing is one of our favorite go to options for dinghy control lines and even halyards. It features a color matched Dyneema SK-78 core for low stretch with a 16 plait cover for improved abrasion resistance and durability. It also can...
    Qty in Cart: 0
    Price:
    $1.60
    Subtotal:
  • 6mm New England Ropes Endura Braid

    6mm New England Ropes Endura Braid

    New England Ropes
    $1.99
    Endura Braid delivers optimal performance, strength and durability for the competitive sailor. It features a specially engineered 12-strand Dyneema core, with marine-tech coating and a 24 plait braided polyester cover. Benefits include a very...
    Qty in Cart: 0
    Price:
    $1.99
    Subtotal:
  • 8mm Maffioli Swiftcord

    8mm Maffioli Swiftcord

    Kingfisher Yacht Ropes

    $1.98
    Gottifredi Maffioli Swiftcord from Kingfisher Ropes is lightweight, strong, durable, comfortable to hold in your hands. Made popular by Olympic dinghy sailors, Swiftcord is a favorite among many active sailors. It is a hollow braid construction with an...
    Qty in Cart: 0
    Price:
    $1.98
    Subtotal:
  • 7mm Maffioli Swiftcord

    7mm Maffioli Swiftcord

    Kingfisher Yacht Ropes
    $1.60
    Gottifredi Maffioli Swiftcord from Kingfisher Ropes is lightweight, strong, durable, comfortable to hold in your hands. Made popular by Olympic dinghy sailors, Swiftcord is a favorite among many active sailors. It is a hollow braid construction with an...
    Qty in Cart: 0
    Price:
    $1.60
    Subtotal:
  • 6mm Maffioli Swiftcord

    6mm Maffioli Swiftcord

    Kingfisher Yacht Ropes
    $1.17
    Gottifredi Maffioli Swiftcord from Kingfisher Ropes is lightweight, strong, durable, comfortable to hold in your hands. Made popular by Olympic dinghy sailors, Swiftcord is a favorite among many active sailors. It is a hollow braid construction with an...
    Qty in Cart: 0
    Price:
    $1.17
    Subtotal:
  • 2.5mm Robline Ocean 3000 Dyneema Line (Grey)

    2.5mm Robline Ocean 3000 Dyneema Line (Grey)

    Robline
    $0.46
    Ocean 3000 from Robline is a high-performance 12-strand single braid line made of 100% Dyneema fiber. It offers a high strength-to-weight ratio (stronger than steel) with very low stretch. High abrasion and cut resistance and it even floats. Recommended...
    Qty in Cart: 0
    Price:
    $0.46
    Subtotal:
  • 4mm Robline Coppa 5000 Line 4mm Robline Coppa 5000 Line

    4mm Robline Coppa 5000 Line

    Robline
    $1.03
    Robline Coppa 5000 is a great high performance line for sheeting on larger dinghies and keelboats. It has a Dyneema SK-78 core and provided with a 24-plait cover for easy splicing and stripping. It is ideal for applications where minimum stretch and...
    Qty in Cart: 0
    Price:
    $1.03
    Subtotal:
  • 5mm Robline Dinghy PolyTech

    5mm Robline Dinghy PolyTech

    Robline
    $2.25
    The Dinghy PolyTech from Robline is an easy-to-splice control line with a Technora cover and is ideally suited for use on skiffs and dinghies. This is our line of choice in our upgraded ILCA control systems and other dinghy controls...
    Qty in Cart: 0
    Price:
    $2.25
    Subtotal:
  • 4mm Robline Dinghy PolyTech

    4mm Robline Dinghy PolyTech

    Robline
    $1.18
    The Dinghy PolyTech from Robline is an easy-to-splice control line with a Technora cover and is ideally suited for use on skiffs and dinghies. This is our line of choice in our upgraded ILCA control systems and other dinghy controls...
    Qty in Cart: 0
    Price:
    $1.18
    Subtotal:
  • New England Ropes Nexus Pro

    7mm New England Ropes Nexus Pro

    New England Ropes
    $1.99
    Nexus Pro by New England Ropes has been developed in cooperation top sailors. Nexus Pro has a durable, lightweight cover that offers excellent grip and holding power. The core is pure Dyneema for ultra-strength and low-stretch. Colors: Blue,...
    Qty in Cart: 0
    Price:
    $1.99
    Subtotal:
  • 6mm Kingfisher Float Line

    6mm Kingfisher Float Line

    Kingfisher Yacht Ropes
    $0.40
    Float Line from Kingfisher is the ideal floating bowline material. The braided multi-filament Polypropylene rope with no core is made from bright colors for high visibility, floats and is an ideal safety rope. 16 Plaint construction Multi-filament...
    Qty in Cart: 0
    Price:
    $0.40
    Subtotal:
  • 5mm Kingfisher Evo Race 78 5mm Kingfisher Evo Race 78

    5mm Kingfisher Evo Race 78

    Kingfisher Yacht Ropes
    $1.13
    Evolution Race 78 from Kingfisher has a high performance Dyneema SK78 12 strand coated core that is high strength, low stretch and low creep. It has a hard wearing HT braided Polyester cover and is easy to splice. Diameter - 5mm (3/16 inch) Core...
    Qty in Cart: 0
    Price:
    $1.13
    Subtotal:
  • 4mm Kingfisher Evo Race 78 4mm Kingfisher Evo Race 78

    4mm Kingfisher Evo Race 78

    Kingfisher Yacht Ropes
    $0.79
    Evolution Race 78 from Kingfisher has a high performance Dyneema SK78 12 strand coated core that is high strength, low stretch and low creep. It has a hard wearing HT braided Polyester cover and is easy to splice. Diameter - 4mm Core - 12 Strand...
    Qty in Cart: 0
    Price:
    $0.79
    Subtotal:
  • 3mm Kingfisher Evo Race 78 3mm Kingfisher Evo Race 78

    3mm Kingfisher Evo Race 78

    Kingfisher Yacht Ropes
    $0.50
    Evolution Race 78 from Kingfisher has a high performance Dyneema SK78 12 strand coated core that is high strength, low stretch and low creep. It has a hard wearing HT braided Polyester cover and is easy to splice. Diameter - 3mm Core - 12 Strand...
    Qty in Cart: 0
    Price:
    $0.50
    Subtotal:
  • 10mm Kingfisher Matte Polyester 10mm Kingfisher Matte Polyester

    10mm Kingfisher Matte Polyester

    Kingfisher Yacht Ropes
    $0.92
    Matte Polyester from Kingfisher is a soft polyester braid on braid with a high grip staple polyester cover. It is ideal for sheets, control lines and classic rigging, and super comfortable in the hand. Diameter - 10mm Core - Polyester Cover...
    Qty in Cart: 0
    Price:
    $0.92
    Subtotal:
  • 8mm Kingfisher Matte Polyester 8mm Kingfisher Matte Polyester

    8mm Kingfisher Matte Polyester

    Kingfisher Yacht Ropes
    $0.68
    Matte Polyester from Kingfisher is a soft polyester braid on braid with a high grip staple polyester cover. It is ideal for sheets, control lines and classic rigging, and super comfortable in the hand. Diameter - 8mm Core - Polyester Cover -...
    Qty in Cart: 0
    Price:
    $0.68
    Subtotal:
  • Total: items /

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Line Diameter Guide

Recommended Diameter by Application & Boat Length

Application

Boat Length
10 - 18 Feet

Boat Length
18 - 24 Feet
Boat Length
24 - 32 Feet
Boat Length
32 - 38 Feet
Boat Length
38 - 45 Feet
Boat Length
45 - 52 Feet
Main Halyard 6mm / 1/4 in  6mm / 1/4 in 8mm / 5/16 in  8mm / 5/16 in  9mm / 3/8 in 11mm / 7/16 in
Jib/Genoa Halyard 6mm / 1/4 in  6mm / 1/4 in 8mm / 5/16 in  8mm / 5/16 in  9mm / 3/8 in 11mm / 7/16 in
Spinnaker Halyard 6mm / 1/4 in  6mm / 1/4 in  8mm / 5/16 in 9mm / 3/8 in  9mm / 3/8 in 11mm / 7/16 in
Topping Lift 6mm / 1/4 in 6mm / 1/4 in 8mm / 5/16 in 9mm / 3/8 in 9mm / 3/8 in 11mm / 7/16 in
Mainsheet 8mm / 5/16 in 9mm / 3/8 in 9mm / 3/8 in 
9mm / 3/8 in  11mm / 7/16 in 12mm / 1/2 in
Jib/Genoa Sheet 6mm / 1/4 in 8mm / 5/16 in 9mm / 3/8 in  9mm / 3/8 in 11mm / 7/16 in 12mm / 1/2 in
Spinnaker Sheet 6mm / 1/4 in 8mm / 5/16 in 8mm / 5/16 in 8mm / 5/16 in 9mm / 3/8 in 9mm / 3/8 in
Tack Line 5mm / 3/16 in 6mm / 1/4 in 9mm / 3/8 in 9mm / 3/8 in  9mm / 3/8 in 11mm / 7/16 in
 

MM to Inch
Conversion Chart

 1mm = 3/64 inch  2mm = 5/64 inch  3mm = 1/8 inch 4mm = 5/32 inch  5mm = 3/16 inch  6mm = 1/4 inch
7mm = 9/32 inch   8mm = 5/16 inch  9mm = 3/8 inch  10mm = 25/64 inch  11mm = 7/16 inch 12mm = 1/2 inch 

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