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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 5000 Heat Set SK78 Dyneema

    3mm Robline Ocean 5000 Heat Set SK78 Dyneema Line

    Robline
    $1.73
    Robline Ocean 5000 is made of pure, pre-streched Dyneema® SK78. Often referred to as "heat-set" Dyneema. The SK78 Dyneema is heated and loaded to a percentage of its breaking load. The process aligns and equalizes the Dyneema fibers which makes for a...
    Qty in Cart: 0
    Price:
    $1.73
    Subtotal:
  • 3mm Kingfisher Evo Race 78 Line 3mm Kingfisher Evo Race 78 Line

    3mm Kingfisher Evo Race 78 Line

    Kingfisher Yacht Ropes
    $0.50
    Evolution Race 78 from Kingfisher has a high performance Dyneema SK78 12 strand coated core that is high strength, low stretch and low creep. It has a hard wearing HT braided Polyester cover and is easy to splice. Diameter - 3mm Core - 12 Strand...
    Qty in Cart: 0
    Price:
    $0.50
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  • 3mm Robline Dinghy Control Line

    3mm Robline Dinghy Control Line

    Ronstan
    $0.52
    Dinghy Control Line from Robline is a great all around high-tech control line with Dyneema® SK78 core. This 3mm 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:
    $0.52
    Subtotal:
  • 3mm Orion 500 Line

    3mm Robline Orion 500 Line

    Ronstan
    $0.21
    3mm Orion 500 from Robline is a great all-around line for small applications such as rudder downhauls and lashing. It has a soft hand, great strength, and is abrasion resistant. Colors: Green Diameter - 3 mm (1/8 inch) Other Available...
    Qty in Cart: 0
    Price:
    $0.21
    Subtotal:
  • 3mm Samson Amsteel-Blue Dyneema Line - Gray

    3mm Samson Amsteel-Blue Dyneema Line

    Samson
    $0.60
    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:
    $0.60
    Subtotal:
  • 3mm Robline Ocean 3000 Dyneema Line (Grey)

    3mm Robline Ocean 3000 Dyneema Line (Grey)

    Robline
    $0.61
    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:
    $0.61
    Subtotal:
  • 3mm Robline Ocean 3000 Dyneema Line - Red

    3mm Robline Ocean 3000 Dyneema Line (Red)

    Robline
    $0.61
    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:
    $0.61
    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:
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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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