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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
  • 5mm Marlow Excel Racing Line

    5mm Marlow Excel Racing Line

    Marlow Ropes
    $1.43
    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:
    $1.43
    Subtotal:
  • 5mm Samson Ultra-Lite Line

    5mm Samson Ultra-Lite Line

    Samson
    $0.66
    Samson Ultra-Lite is lightweight, floating double braid line with a modest strength/weight ratio and a great price point. This 5 mm version is ideal for light-wind sheets for the club racer or performance cruiser and features a Dyneema SK-75/MFP...
    Qty in Cart: 0
    Price:
    $0.66
    Subtotal:
  • 5mm Spectra Line

    5mm Samson Amsteel-Blue Dyneema Line

    Samson

    $1.20
    Amsteel Blue from Samson 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 thanks to a Samthane coating...
    Qty in Cart: 0
    Price:
    $1.20
    Subtotal:
  • mm Samson Validator 12 Vectran Line

    5mm Samson Validator 12 Vectran Line

    Samson
    $1.73
    This 5mm Samson Vectran line is made from Validator-12, constructed of Vectran® fibers, the second strongest rope in the Samson line. A LCP (liquid crystal polymer) fiber, Vectran exhibits high strength, excellent creep and abrasion resistance,...
    Qty in Cart: 0
    Price:
    $1.73
    Subtotal:
  • 5mm Shockcord

    5mm Shockcord

    Novabraid
    $0.36
    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 5mm shock cord offer superior protection against abrasion...
    Qty in Cart: 0
    Price:
    $0.36
    Subtotal:
  • 5mm Polypropylene Line

    5mm Polypropylene Line

    R&W Marine Cordage
    $0.33
    The polypropylene line is a multipurpose line that can be used for a variety of things from bow lines to dock lines. Because of its large diameter, and flotation, this line is great for general purpose around the water. Lightweight floating line General...
    Qty in Cart: 0
    Price:
    $0.33
    Subtotal:
  • 7mm Robline Coppa 5000 Line Blue 7mm Robline Coppa 5000 Line Lime

    7mm Robline Coppa 5000 Line

    Robline
    $2.73
    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:
    $2.73
    Subtotal:
  • 7mm Robline Dinghy Sheet XL Line

    7mm Robline Dinghy Sheet XL Line

    Robline
    $0.77
    Dinghy Sheet XL from Robline was designed specifically to avoid kinks in a small boat applications such as main or jib sheets. This line offers good grip and abrasion resistance while keeping a round shape under load. The polyester/polyamide blend cover...
    Qty in Cart: 0
    Price:
    $0.77
    Subtotal:
  • New England Ropes 7mm Bzzz Line Blue

    7mm New England Ropes Bzzz Line

    New England Ropes
    $0.79
    Dinghy and small boat sailors love New England Ropes Bzzz line for its soft feel and kink-free performance, thanks to a unique combination of spun polyester and multi-filament polypropylene (MFP). As a single braid blend, this lightweight line retains...
    Qty in Cart: 0
    Price:
    $0.79
    Subtotal:
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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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