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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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  • 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:
  • 5.5mm Robline Coppa 5000 Line Red 5.5mm Robline Coppa 5000 Line Blue

    5.5mm Robline Coppa 5000 Line

    Robline
    $1.52
    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:
    $1.52
    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 Marlow PreStretch Line

    6mm Marlow PreStretch Line

    Marlow Ropes
    $0.65
    6mm Marlow PreStretch is a 100% polyester single braid line that is pre-stretched to improve strength and reduce elongation. It cleats very well and has great abrasion resistance. A great option for any small sailboat halyard or control line applications...
    Qty in Cart: 0
    Price:
    $0.65
    Subtotal:
  • 6mm Polypropylene Line

    6mm Polypropylene Line

    R&W Marine Cordage
    $0.36
    This polypropylene line is perfect for small boat bow lines and is the perfect choice for Optis and other small prams. Lightweight, floats, and sturdy enough for towing. Lightweight floating line General purpose line Sold by the foot
    Qty in Cart: 0
    Price:
    $0.36
    Subtotal:
  • 6mm Robline Admiral 5000 Line Blue 6mm Robline Admiral 5000 Line Green

    6mm Robline Admiral 5000 Line

    Robline
    $1.28
    Robline Admiral 5000 is an allround rope that is easy to splice and taper while offering highest breaking load values at the same time. Recommended for halyards on larger boards where low stretch is required. Admiral 5000 is made for sailors and...
    Qty in Cart: 0
    Price:
    $1.28
    Subtotal:
  • 6mm Robline Dinghy Control Line

    6mm Robline Dinghy Control Line

    Robline
    $1.68
    Dinghy Control Line from Robline is a great all around high-tech control line with Dyneema® SK78 core. This 6mm version is ideal for all kinds of applications where you need the strength of a low-stretch core with the durability of a cover, such as...
    Qty in Cart: 0
    Price:
    $1.68
    Subtotal:
  • 6mm Robline Dinghy Sheet XL

    6mm Robline Dinghy Sheet XL Line

    Robline
    $0.64
    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:
    $0.64
    Subtotal:
  • 6mm Robline Orion 300 Line Green 6mm Robline Orion 300 Line Red

    6mm Robline Orion 300 Line

    Robline
    $0.52
    Robline Orion 300 is a versatile all-round rope featuring a traditional design. Its high UV resistance, longevity, and great ease of handling make this product a benchmark for many recreational and cruising applications. The soft hand and durable...
    Qty in Cart: 0
    Price:
    $0.52
    Subtotal:
  • 6mm Rooster Polilite Line

    6mm Rooster Polilite Line

    Rooster Sailing

    $0.74
    Rooster Polilite line was designed specifically for the headache of dealing with a tangled Laser mainsheet. This line is strong, prevents tangles, and has minimal water absorption - perfect as a mainsheet on a Laser or any number of other boats! This 6...
    Qty in Cart: 0
    Price:
    $0.74
    Subtotal:
  • 6mm Samson Ultra-Lite Line

    6mm Samson Ultra-Lite Line

    Samson
    $1.05
    Samson Ultra-Lite is lightweight, floating double braid line with a modest strength/weight ratio and a great price point. This 6 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:
    $1.05
    Subtotal:
  • 6mm Shockcord Blue

    6mm Shockcord

    R&W Marine Cordage
    $0.46
    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:
    $0.46
    Subtotal:
  • 7mm Robline Coppa 5000 Line Black 7mm Robline Coppa 5000 Line Blue

    7mm Robline Coppa 5000 Line

    Robline
    $2.49
    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:
    $2.49
    Subtotal:
  • 7mm Robline Dinghy Sheet XL Line

    7mm Robline Dinghy Sheet XL Line

    Robline
    $0.73
    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:
    $0.73
    Subtotal:
  • 7mm Rooster Polilite Line Black 7mm Rooster Polilite Line Blue

    7mm Rooster Polilite Line

    Rooster Sailing
    $0.79
    Rooster Polilite line was designed specifically for the headache of dealing with a tangled Laser mainsheet. This line is strong, prevents tangles, and has minimal water absorption - perfect as a mainsheet on a Laser or any number of other boats! This 7...
    Qty in Cart: 0
    Price:
    $0.79
    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:
  • 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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