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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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  • 10mm Marlow D2 Racing Line

    10mm Marlow D2 Racing Line

    Marlow Ropes

    $3.72
    The pre-stretched, bio-based D12 78 core makes Marlow D2 Racing a high-strength, lightweight all-round performer. It is color coded with the cover ensuring identification is assured even if the cover is stripped. Upgrade polyester halyards with D2 Racing...
    Qty in Cart: 0
    Price:
    $3.72
    Subtotal:
  • 8mm Marlow D2 Racing

    8mm Marlow D2 Racing Line

    Marlow Ropes
    $2.92
    The pre-stretched, bio-based D12 78 core makes Marlow D2 Racing a high-strength, lightweight all-round performer. It is color coded with the cover ensuring identification is assured even if the cover is stripped. Upgrade polyester halyards with D2 Racing...
    Qty in Cart: 0
    Price:
    $2.92
    Subtotal:
  • 8mm New England Ropes Sta-Set Line

    8mm New England Ropes Sta-Set Line

    New England Ropes
    $1.04
    Sta-Set is a strong, flexible and long wearing performance double braid polyester line with superior durability and dependability. It is high strength, low stretch, and extremely durable, yet it still remains soft over time. Sta-Set is both easy to...
    Qty in Cart: 0
    Price:
    $1.04
    Subtotal:
  • 5mm New England Ropes Sta-Set

    5mm New England Ropes Sta-Set Line

    New England Ropes
    $0.51
    Sta-Set is a strong, flexible and long wearing performance double braid polyester line with superior durability and dependability. It is high strength, low stretch, and extremely durable, yet it still remains soft over time. Sta-Set is both easy to...
    Qty in Cart: 0
    Price:
    $0.51
    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:
  • 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:
  • 6mm Kingfisher Evo Dinghy Line 6mm Kingfisher Evo Dinghy Line

    6mm Kingfisher Evo Dinghy Line

    Kingfisher Yacht Ropes
    $0.40
    Evolution dinghy line from Kingfisher has been developed in conjunction with some of the worlds leading dinghy manufacturers. The 32 plait Polyester cover provides good abrasion resistance and excellent performance in cleats. It is ideal for halyards and...
    Qty in Cart: 0
    Price:
    $0.40
    Subtotal:
  • 5mm Kingfisher Evo Dinghy Line 5mm Kingfisher Evo Dinghy Line

    5mm Kingfisher Evo Dinghy Line

    Kingfisher Yacht Ropes
    $0.35
    Evolution dinghy line from Kingfisher has been developed in conjunction with some of the worlds leading dinghy manufacturers. The 32 plait Polyester cover provides good abrasion resistance and excellent performance in cleats. It is ideal for halyards and...
    Qty in Cart: 0
    Price:
    $0.35
    Subtotal:
  • 10mm New England Ropes Sta-Set

    10mm New England Ropes Sta-Set Line

    New England Ropes
    $1.31
    Sta-Set is a strong, flexible and long wearing performance double braid polyester line with superior durability and dependability. It is high strength, low stretch, and extremely durable, yet it still remains soft over time. Sta-Set is both easy to...
    Qty in Cart: 0
    Price:
    $1.31
    Subtotal:
  • 6mm New England Ropes Sta-Set

    6mm New England Ropes Sta-Set Line

    New England Ropes
    $0.77
    Sta-Set is a strong, flexible and long wearing performance double braid polyester line with superior durability and dependability. It is high strength, low stretch, and extremely durable, yet it still remains soft over time. Sta-Set is both easy to...
    Qty in Cart: 0
    Price:
    $0.77
    Subtotal:
  • 2mm Robline Dinghy Control Line

    2mm Robline Dinghy Control Line

    Robline
    $0.26
    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:
    $0.26
    Subtotal:
  • 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:
  • 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:
  • 4mm Alpha SSR Line

    4mm Alpha SSR Line

    Alpha Ropes
    $0.54
    4mm SSR from Alpha Ropes is a perfect sail control line 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 Maffiloli switfcord...
    Qty in Cart: 0
    Price:
    $0.54
    Subtotal:
  • 5mm Sirius 500 Line

    5mm Robline Sirius 500 Line

    Robline

    $0.45
    5mm Sirius 500 from Robline is a great low stretch yet affordable line for control lines, halyards, and other application on recreational sailboats. This is a double braid polyester line, meaning it has a 8-plait polyester core and a 32-plait polyester...
    Qty in Cart: 0
    Price:
    $0.45
    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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