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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 Marlow Excel Control

    5mm Marlow Excel Control Line

    Marlow Ropes
    $0.89
    Marlow Excel Control was the first first and remains best dedicated line for continuous loop dinghy control lines. The special snakeskin pattern means end-to-end, endless loop splicing with no diameter increase is much easier. Technora cover provides...
    Qty in Cart: 0
    Price:
    $0.89
    Subtotal:
  • 4mm Marlow Excel Control

    4mm Marlow Excel Control Line

    Marlow Ropes
    $0.56
    Marlow Excel Control was the first first and remains best dedicated line for continuous loop dinghy control lines. The special snakeskin pattern means end-to-end, endless loop splicing with no diameter increase is much easier. Technora cover provides...
    Qty in Cart: 0
    Price:
    $0.56
    Subtotal:
  • 6mm Marlow Excel Racing GP78

    6mm Marlow Excel Racing GP78 Line

    Marlow Ropes
    $2.56
    Marlow Excel Racing GP78 is a high performance dinghy and keelboat control line. The SK78 core is high strength and minimal creep and the Technora blended cover gives fantastic abrasion and heat resistance. The cover also adds grip for wet hands, and is...
    Qty in Cart: 0
    Price:
    $2.56
    Subtotal:
  • 5mm Marlow Excel Racing GP78

    5mm Marlow Excel Racing GP78 Line

    Marlow Ropes
    $1.99
    Marlow Excel Racing GP78 is a high performance dinghy and keelboat control line. The SK78 core is high strength and minimal creep and the Technora blended cover gives fantastic abrasion and heat resistance. The cover also adds grip for wet hands, and is...
    Qty in Cart: 0
    Price:
    $1.99
    Subtotal:
  • 4mm Marlow Excel Racing GP78

    4mm Marlow Excel Racing GP78 Line

    Marlow Ropes
    $1.26
    Marlow Excel Racing GP78 is a high performance dinghy and keelboat control line. The SK78 core is high strength and minimal creep and the Technora blended cover gives fantastic abrasion and heat resistance. The cover also adds grip for wet hands, and is...
    Qty in Cart: 0
    Price:
    $1.26
    Subtotal:
  • 9mm Robline Coppa DURA

    9mm Robline Coppa DURA Line

    Robline
    $3.71
    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:
    $3.71
    Subtotal:
  • 7mm Robline Coppa DURA

    7mm Robline Coppa DURA Line

    Robline
    $2.60
    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:
    $2.60
    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:
  • 4mm Robline Dinghy Control Line

    4mm Robline Dinghy Control Line

    Robline
    $0.73
    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:
    $0.73
    Subtotal:
  • 5mm Robline Dinghy Control Line

    5mm Dinghy Control Line

    Robline
    $1.18
    Dinghy Control Line from Robline is a great all around high-tech control line with Dyneema SK78 core. This 5mm 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 using...
    Qty in Cart: 0
    Price:
    $1.18
    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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