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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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  • 8mm Robline Globe PRO

    8mm Robline Globe PRO Line

    Robline
    $1.63
    Developed with professional riggers, Globe Pro from Robline is a brand new product design for high performance applications. The 12-strand Robtec core is fully coated and may be stripped and tapered as needed. The core offers high breaking loads and is...
    Qty in Cart: 0
    Price:
    $1.63
    Subtotal:
  • 4mm Robline Coppa 5000 Line 4mm Robline Coppa 5000 Line Line

    4mm Robline Coppa 5000 Line 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 Line

    Robline
    $2.55
    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:
    $2.55
    Subtotal:
  • 4mm Robline Dinghy PolyTech

    4mm Robline Dinghy PolyTech Line

    Robline
    $1.40
    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:
    $1.40
    Subtotal:
  • 2mm Robline Dinghy Control Line

    2mm Robline Dinghy Control Line

    Robline
    $0.27
    Dinghy Control Line from Robline is a great all around high-tech control line with Dyneema® SK78 core. This 2mm version is ideal for small applications or lashing blocks on dinghies. Colors: Red,  Blue, Green, Yellow Diameter - 2mm (5/64...
    Qty in Cart: 0
    Price:
    $0.27
    Subtotal:
  • 4mm Robline Dinghy Control Line

    4mm Robline Dinghy Control Line

    Robline
    $0.76
    Dinghy Control Line from Robline is a great all around high-tech control line with Dyneema® SK78 core. This 4mm 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:
    $0.76
    Subtotal:
  • 5.5mm Robline Coppa 5000 Line Red 5.5mm Robline Coppa 5000 Line Blue

    5.5mm Robline Coppa 5000 Line

    Robline
    $1.52 - $1.59
    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 - $1.59
    Subtotal:
  • 7mm Robline Coppa 5000 Line Blue 7mm Robline Coppa 5000 Line Lime

    7mm Robline Coppa 5000 Line

    Robline
    $2.60 - $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:
    $2.60 - $2.73
    Subtotal:
  • 8mm Robline Admiral 5000 Line Green 8mm Robline Admiral 5000 Line Green

    8mm Robline Admiral 5000 Line

    Robline
    $2.11
    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:
    $2.11
    Subtotal:
  • 9mm Robline Coppa 5000 Line Blue 9mm Robline Coppa 5000 Line Lime

    9mm Robline Coppa 5000 Line

    Robline
    $3.90
    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:
    $3.90
    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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