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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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  • Product
  • Qty in Cart
  • Quantity
  • Price
  • Subtotal
  • 9mm Robline Racing Pro Line 9mm Robline Racing Pro Line

    9mm Robline Racing Pro Line

    Robline
    $2.37
    Robline Racing Pro is a 12 strand single braid line made with a high tech mix of Dyneema and Technora fibers for minimal stretch and abrasion. This high tech mix of fibers provides a soft hand feel, great cleating ability and remarkable longevity...
    Qty in Cart: 0
    Price:
    $2.37
    Subtotal:
  • 7mm Robline Racing Pro Line 7mm Robline Racing Pro Line

    7mm Robline Racing Pro Line

    Robline
    $1.56
    Robline Racing Pro is a 12 strand single braid line made with a high tech mix of Dyneema and Technora fibers for minimal stretch and abrasion. This high tech mix of fibers provides a soft hand feel, great cleating ability and remarkable longevity...
    Qty in Cart: 0
    Price:
    $1.56
    Subtotal:
  • 8mm Marlow Excel Fusion Line

    8mm Marlow Excel Fusion Line

    Marlow Ropes
    $2.26
    Marlow Excel Fusion is a high performance line featuring a blended Dyneema and Polypropylene cover, ensuring no water absorption, great abrasion resistance through ratchets and cleats, and a soft feel in the hand. The Dyneema SK78 core provides...
    Qty in Cart: 0
    Price:
    $2.26
    Subtotal:
  • 7mm Marlow Excel Fusion Line

    7mm Marlow Excel Fusion Line

    Marlow Ropes
    $1.82
    Marlow Excel Fusion is a high performance line featuring a blended Dyneema and Polypropylene cover, ensuring no water absorption, great abrasion resistance through ratchets and cleats, and a soft feel in the hand. The Dyneema SK78 core provides...
    Qty in Cart: 0
    Price:
    $1.82
    Subtotal:
  • 6mm Marlow Excel Racing

    6mm Marlow Excel Racing Line

    Marlow Ropes
    $1.62
    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:
    $1.62
    Subtotal:
  • 8mm Maffioli Swiftcord Line

    8mm Maffioli Swiftcord Line

    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 Line

    7mm Maffioli Swiftcord Line

    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 Line

    6mm Maffioli Swiftcord Line

    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:
  • 8mm Kingfisher Evo Sheet Line 8mm Kingfisher Evo Sheet Line

    8mm Kingfisher Evo Sheet Line

    Kingfisher Yacht Ropes
    $0.78
    Evolution Sheet from Kingfisher has a braided HT Polyester cover and lightweight braided multi-filament Polypropylene core. This construction gives added abrasion resistance and is still very flexible, lightweight and strong.  Diameter - 8mm...
    Qty in Cart: 0
    Price:
    $0.78
    Subtotal:
  • 7mm Kingfisher Evo Sheet Line 7mm Kingfisher Evo Sheet Line

    7mm Kingfisher Evo Sheet Line

    Kingfisher Yacht Ropes
    $0.64
    Evolution Sheet from Kingfisher has a braided HT Polyester cover and lightweight braided multi-filament Polypropylene core. This construction gives added abrasion resistance and is still very flexible, lightweight and strong.  Diameter -...
    Qty in Cart: 0
    Price:
    $0.64
    Subtotal:
  • 6mm Kingfisher Evo Sheet Line 6mm Kingfisher Evo Sheet Line

    6mm Kingfisher Evo Sheet Line

    Kingfisher Yacht Ropes
    $0.58
    Evolution Sheet from Kingfisher has a braided HT Polyester cover and lightweight braided multi-filament Polypropylene core. This construction gives added abrasion resistance and is still very flexible, lightweight and strong.  Diameter -...
    Qty in Cart: 0
    Price:
    $0.58
    Subtotal:
  • 6mm Kingfisher Evo Dinghy Line 6mm Kingfisher Evo Dinghy Line

    6mm Kingfisher Evo Dinghy Line

    Kingfisher Yacht Ropes
    $0.40
    Evolution dinghy line from Kingfisher has been developed in conjunction with some of the worlds leading dinghy manufacturers. The 32 plait Polyester cover provides good abrasion resistance and excellent performance in cleats. It is ideal for halyards and...
    Qty in Cart: 0
    Price:
    $0.40
    Subtotal:
  • 5mm Kingfisher Evo Dinghy Line 5mm Kingfisher Evo Dinghy Line

    5mm Kingfisher Evo Dinghy Line

    Kingfisher Yacht Ropes
    $0.35
    Evolution dinghy line from Kingfisher has been developed in conjunction with some of the worlds leading dinghy manufacturers. The 32 plait Polyester cover provides good abrasion resistance and excellent performance in cleats. It is ideal for halyards and...
    Qty in Cart: 0
    Price:
    $0.35
    Subtotal:
  • 3mm Shockcord Black

    3mm Shockcord

    Novabraid
    $0.16
    Shockcord (sometimes called bungee) is a stretchy line used in a variety of sailboat applications including inhauls, daggerboard retainer, or as a tensioner for hiking strap lines. This premium 3mm shock cord offer superior protection against abrasion...
    Qty in Cart: 0
    Price:
    $0.16
    Subtotal:
  • 4mm Alpha SSR Line

    4mm Alpha SSR Line

    Alpha Ropes
    $0.54
    4mm SSR from Alpha Ropes is a perfect sail control line on small boats and designed with Olympic racers in mind. A single braid blend of Spectra and Cordura makes this line both durable and soft in the hand. Very similar to Maffiloli switfcord...
    Qty in Cart: 0
    Price:
    $0.54
    Subtotal:
  • 5mm Sirius 500 Line

    5mm Robline Sirius 500 Line

    Robline

    $0.45
    5mm Sirius 500 from Robline is a great low stretch yet affordable line for control lines, halyards, and other application on recreational sailboats. This is a double braid polyester line, meaning it has a 8-plait polyester core and a 32-plait polyester...
    Qty in Cart: 0
    Price:
    $0.45
    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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