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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 Maffioli Swiftcord Line

    8mm Maffioli Swiftcord Line

    Kingfisher Yacht Ropes

    $1.98
    Gottifredi Maffioli Swiftcord from Kingfisher Ropes is lightweight, strong, durable, comfortable to hold in your hands. Made popular by Olympic dinghy sailors, Swiftcord is a favorite among many active sailors. It is a hollow braid construction with an...
    Qty in Cart: 0
    Price:
    $1.98
    Subtotal:
  • 7mm Maffioli Swiftcord Line

    7mm Maffioli Swiftcord Line

    Kingfisher Yacht Ropes
    $1.60
    Gottifredi Maffioli Swiftcord from Kingfisher Ropes is lightweight, strong, durable, comfortable to hold in your hands. Made popular by Olympic dinghy sailors, Swiftcord is a favorite among many active sailors. It is a hollow braid construction with an...
    Qty in Cart: 0
    Price:
    $1.60
    Subtotal:
  • 6mm Maffioli Swiftcord Line

    6mm Maffioli Swiftcord Line

    Kingfisher Yacht Ropes
    $1.17
    Gottifredi Maffioli Swiftcord from Kingfisher Ropes is lightweight, strong, durable, comfortable to hold in your hands. Made popular by Olympic dinghy sailors, Swiftcord is a favorite among many active sailors. It is a hollow braid construction with an...
    Qty in Cart: 0
    Price:
    $1.17
    Subtotal:
  • 3mm Robline Ocean 5000 Heat Set SK78 Dyneema

    3mm Robline Ocean 5000 Heat Set SK78 Dyneema Line

    Robline
    $1.64
    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:
    $1.64
    Subtotal:
  • 2mm Robline Ocean 5000 Heat Set SK78 Dyneema

    2mm Robline Ocean 5000 Heat Set SK78 Dyneema Line

    Robline
    $1.27
    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:
    $1.27
    Subtotal:
  • 2.5mm Robline Ocean 3000 Dyneema Line (Grey)

    2.5mm Robline Ocean 3000 Dyneema Line (Grey)

    Robline
    $0.46
    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:
    $0.46
    Subtotal:
  • 8mm Robline Globe PRO

    8mm Robline Globe PRO Line

    Robline
    $1.56
    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:
    $1.56
    Subtotal:
  • 7mm Marlow Excel Matrix

    7mm Marlow Excel Matrix Line

    Marlow Ropes
    $1.95
    Excel Matrix from Marlow is a high performance dinghy and small keelboat sheet. This is an ideal choice for spinnaker sheets. Does not kink or absorb water and is easy to taper thanks to thicker Dyneema core and thinner cover. High grip, blended cover of...
    Qty in Cart: 0
    Price:
    $1.95
    Subtotal:
  • 6mm Marlow Excel Matrix Line

    6mm Marlow Excel Matrix Line

    Marlow Ropes
    $1.68
    Excel Matrix from Marlow is a high performance dinghy and small keelboat sheet. This is an ideal choice for spinnaker sheets. Does not kink or absorb water and is easy to taper thanks to thicker Dyneema core and thinner cover. High grip, blended cover of...
    Qty in Cart: 0
    Price:
    $1.68
    Subtotal:
  • 9mm Robline Coppa DURA

    9mm Robline Coppa DURA Line

    Robline
    $3.62
    Robline Coppa Dura is a sheet for challenging demands aboard sporty boats, especially where little stretch, good grip and low abrasion are needed. This line offers maximum grippiness for ideal manual handling and yet great durability in aggressive...
    Qty in Cart: 0
    Price:
    $3.62
    Subtotal:
  • 7mm Robline Coppa DURA

    7mm Robline Coppa DURA Line

    Robline
    $2.49
    Robline Coppa Dura is a sheet for challenging demands aboard sporty boats, especially where little stretch, good grip and low abrasion are needed. This line offers maximum grippiness for ideal manual handling and yet great durability in aggressive...
    Qty in Cart: 0
    Price:
    $2.49
    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
    $2.43
    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:
    $2.43
    Subtotal:
  • 4mm Robline Dinghy PolyTech

    4mm Robline Dinghy PolyTech Line

    Robline
    $1.34
    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:
    $1.34
    Subtotal:
  • New England Ropes Nexus Pro

    7mm New England Ropes Nexus Pro Line

    New England Ropes
    $1.99
    Nexus Pro by New England Ropes has been developed in cooperation top sailors. Nexus Pro has a durable, lightweight cover that offers excellent grip and holding power. The core is pure Dyneema for ultra-strength and low-stretch. Colors: Blue,...
    Qty in Cart: 0
    Price:
    $1.99
    Subtotal:
  • 6mm Kingfisher Float Line

    6mm Kingfisher Float Line

    Kingfisher Yacht Ropes
    $0.40
    Float Line from Kingfisher is the ideal floating bowline material. The braided multi-filament Polypropylene rope with no core is made from bright colors for high visibility, floats and is an ideal safety rope. 16 Plaint construction Multi-filament...
    Qty in Cart: 0
    Price:
    $0.40
    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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