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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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  • 3mm Robline Ocean 3000 Dyneema Line

    3mm Robline Ocean 3000 Dyneema Line

    Robline
    $0.64
    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:
    $0.64
    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

    $0.47
    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:
    $0.47
    Subtotal:
  • 6mm Alpha SSR Line

    6mm Alpha SSR Line

    Alpha Ropes
    $1.17
    6mm SSR from Alpha Ropes is a perfect larger diameter sail control line or sheet 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...
    Qty in Cart: 0
    Price:
    $1.17
    Subtotal:
  • 6mm Robline Dinghy Sheet XL

    6mm Robline Dinghy Sheet XL Line

    Robline
    $0.67
    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:
    $0.67
    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:
  • 8mm Orion 500 Line

    8mm Robline Orion 500 Line

    Robline
    $0.78
    8mm Orion 500 from Robline is one of our favorite all-around, jack-of-all-trades type line options. It is a fantastic all purpose polyester line suitable for mainsheets and jib sheets in many small sailboats. It has a soft hand, great strength, and is...
    Qty in Cart: 0
    Price:
    $0.78
    Subtotal:
  • 8mm Alpha SSR Line

    8mm Alpha SSR Line

    Alpha Ropes
    $1.68
    8mm SSR from Alpha Ropes is a perfect larger diameter sail control line or sheet 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...
    Qty in Cart: 0
    Price:
    $1.68
    Subtotal:
  • 8mm Robline Dinghy Sheet XL Line

    8mm Robline Dinghy Sheet XL Line

    Robline
    $0.91
    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:
    $0.91
    Subtotal:
  • 8mm Shockcord

    8mm Shockcord

    R&W Marine Cordage
    $0.55
    Shockcord (sometimes called bungee) is a stretchy line used in a variety of sailboat applications. This premium 6mm shock cord offer superior protection against abrasion and UV and is great for medium to heavy duty applications. The core is comprised of...
    Qty in Cart: 0
    Price:
    $0.55
    Subtotal:
  • 9mm Top Cruiser Kmix Line

    9mm Alpha Cruiser 24 Kmix

    Alpha Ropes
    $1.26
    Cruiser 24 Kmix from Alpha Ropes is a great all around line for sheets and other large diameter applications. This 9 mm double braid line is light weight and offers great grip. It features strong polyester core with 24 plait polyester cover for great...
    Qty in Cart: 0
    Price:
    $1.26
    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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