Dock & Mooring Lines
Docking & Mooring Guide
Dock Lines, Mooring Lines & Fenders Guide
Learn how to choose dock lines, mooring lines, spring lines, fender lines, rope accessories, and fenders for safer tie-ups at slips, docks, pilings, mooring buoys, and transient stops.
Use the right line size, protect every chafe point, and set spring lines so the boat can move without hitting the dock.
This guide is general boating guidance. Confirm line ratings, cleat capacity, marina rules, tides, weather, and vessel-specific requirements before leaving the boat unattended.
Quick Answers
Line Size
Common Dock Line Starting Points
| Boat Length | Common Line Diameter | Typical Use |
|---|---|---|
| Under 20 ft | 3/8 in | Small boats in protected slips |
| 21-34 ft | 1/2 in | Common recreational dock line size |
| 35-45 ft | 5/8 in | Larger cruisers and heavier loads |
| 46-60 ft | 3/4 in | Large boats or exposed conditions |
Size up for heavy displacement, exposed docks, storms, strong wake, rough pilings, or commercial use.
Length
How Long Should Dock Lines Be?
Bow and stern lines are often around two-thirds of boat length as a starting point. Spring lines are commonly close to the boat's length or longer so they can run at useful angles.
Fixed docks, tides, pilings, rafting, and storm prep may require longer lines and more chafe protection.
Nylon
Popular for dock lines because it stretches and absorbs shock from wake, wind, and surge.
Polyester
Good UV and abrasion performance with lower stretch. Useful where controlled movement is important.
Floating Rope
Useful for safety, tenders, and visible temporary lines, but not always the right dock-line material.
Dock Setup
Use Bow, Stern, and Spring Lines Together
A secure dock setup usually uses bow and stern lines to hold the boat near the dock and spring lines to control forward and backward movement. The boat should have enough give to absorb wake and tide, but not enough movement to strike the dock or neighboring boats.
Fenders
Fenders Protect the Hull, Lines Hold the Boat
Fenders should be placed where the boat may contact the dock, piling, wall, or another boat. They do not replace properly set lines.
Placement
Place Fenders Before You Need Them
Rig fenders before entering a slip or approaching a fuel dock. Adjust height for the dock edge, pilings, freeboard, and expected wake or tide changes.
Carry extra fenders for rafting, locks, unfamiliar docks, or changing docking plans.
Inspection
When to Replace Dock Lines
Replace dock lines when strength is uncertain or visible damage appears. Permanent dock lines age faster than lines stored clean and dry.
FAQ
Docking & Mooring Questions
What is the difference between dock lines and mooring lines?
Dock lines usually secure a boat to a dock, pier, piling, or another boat. Mooring lines are usually heavier-duty lines for mooring buoys, mooring fields, permanent berths, or longer-term securing.
What size dock lines do I need?
As a starting point, many recreational boats use 3/8 inch for under 20 feet, 1/2 inch for 21 to 34 feet, 5/8 inch for 35 to 45 feet, and 3/4 inch for 46 to 60 feet. Adjust for boat weight, exposure, and hardware.
Are nylon or polyester lines better?
Nylon is usually preferred for dock lines because it stretches and absorbs shock. Polyester has strong UV and abrasion resistance with lower stretch.
Can dock lines be too tight?
Yes. Lines that are too tight can shock-load cleats, prevent the boat from rising and falling, and fail during wake or tide changes.
Ready to Set Up Your Dock Lines?
Shop Dock Lines, Mooring Lines, Fenders & Accessories
Use the collection page or search by line type, diameter, material, length, fender setup, chafe protection, or storage accessory.
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Sea Dog Premium Double Braided Nylon Dock Line
100% premium double braided nylon Professionally spliced soft eye at one end Yacht whipped at the bitter end and splice point
Seachoice High Quality Dock Rope for Boating - 3-Strand Twisted Nylon Dock Line, ⅜-Inch x 15 Feet, White
Manufactured with modern machinery and synthetic materials offering superior strength and durability, this 3-strand twisted nylon dock line with 10...
View full detailsSeachoice Double-Braid Nylon Dock Line w/ Eye Splice, Pre-Shrunk, Heat Stabilized, 3/4 In. X 35 Ft., White
This Seachoice Double Braid Nylon Dock Line is durable and dependable, and helps a boater tie up securely and reliably when docking. This premium, ...
View full detailsSea Dog 302112020GW1 Premium Double Braided Nylon Dock Line, 1/2" x 20', Gold/White
100% premium double braided nylon Professionally spliced soft eye at one end Yacht whipped at the bitter end and splice point
Sea Dog Premium Double Braided Nylon Dock Line
100% premium double braided nylon Professionally spliced soft eye at one end Yacht whipped at the bitter end and splice point
Seachoice High Quality Dock Rope for Boating - 3-Strand Twisted Nylon Dock Line, ⅜-Inch x 10 Feet, White
Manufactured with modern machinery and synthetic materials offering superior strength and durability, this 3-strand twisted nylon dock line with 10...
View full detailsSeachoice High Quality Dock Rope for Boating - 3-Strand Twisted Nylon Dock Line, ⅜-Inch x 20 Feet, White
Manufactured with modern machinery and synthetic materials offering superior strength and durability, this 3-strand twisted nylon dock line with 10...
View full detailsSeachoice Double-Braid Nylon Dock Line w/ Eye Splice, Pre-Shrunk, Heat Stabilized, 3/4 In. X 50 Ft., White
This Seachoice Double Braid Nylon Dock Line is durable and dependable, and helps a boater tie up securely and reliably when docking. This premium, ...
View full detailsSeachoice Double-Braid Nylon Dock Line w/ Eye Splice, Pre-Shrunk, Heat Stabilized, 3/4 In. X 25 Ft., White
This Seachoice Double Braid Nylon Dock Line is durable and dependable, and helps a boater tie up securely and reliably when docking. This premium, ...
View full detailsSeachoice Dock Line Bungee 6-9 Ft., Double-Braid, Pack of 2
These Seachoice Bungee/Stretch Dock Lines stretch to absorb shocks or sudden jolts caused by waves and wakes, and ensure that a boat remains secure...
View full detailsSeachoice Dock Line Bungee 4-5.5 Ft., Double-Braid, Pack of 2
These Seachoice Bungee/Stretch Dock Lines stretch to absorb shocks or sudden jolts caused by waves and wakes, and ensure that a boat remains secure...
View full detailsSeachoice 42431 High Quality Dock Rope for Boating - Double-Braid MFP Dock Line, ⅜-Inch x 15 Feet, Black/Red
Manufactured with modern machinery and synthetic materials offering superior strength and durability, this double-braided multifilament polypropyle...
View full detailsSeachoice Dock Line Bungee 5-7 Ft., Double-Braid, Pack of 2
These Seachoice Bungee/Stretch Dock Lines stretch to absorb shocks or sudden jolts caused by waves and wakes, and ensure that a boat remains secure...
View full detailsSeachoice Double-Braid Nylon Dock Line w/ Eye Splice, Pre-Shrunk, Heat Stabilized, 5/8 In. X 30 Ft., Navy Blue
This Seachoice Double Braid Nylon Dock Line is durable and dependable, and helps a boater tie up securely and reliably when docking. This premium, ...
View full detailsSeachoice 46961 Double-Braid Nylon Dock Line w/ Eye Splice, Pre-Shrunk, Heat Stabilized, 5/8 In. X 30 Ft., Black
This Seachoice Double Braid Nylon Dock Line is durable and dependable, and helps a boater tie up securely and reliably when docking. This premium, ...
View full detailsSeachoice Premium 3-Strand Twisted Nylon Dock Line With Tracer, White w/Blue Tracer, 5/8-Inch x 35 Feet, 10-Inch Eye Splice
This Seachoice Premium 3-Strand Twisted Nylon Dock Line With Tracer is durable and dependable and helps ensure the most reliable docking. This 3-st...
View full detailsSeachoice 46951 Double-Braid Nylon Dock Line w/ Eye Splice, Pre-Shrunk, Heat Stabilized, 5/8 In. X 30 Ft., White
This Seachoice Double Braid Nylon Dock Line is durable and dependable, and helps a boater tie up securely and reliably when docking. This premium, ...
View full detailsSeachoice Double Braided Dock Rope for Boating - 100% MFP Dock Line, ⅜-Inch x 15 Feet, Red with Black Tracer
This Seachoice Double Braided 100% MFP Dock Line is durable and dependable, and helps a boater tie up securely and reliably when docking. This high...
View full detailsSeachoice Double-Braid Nylon Dock Line w/ Eye Splice, Pre-Shrunk, Heat Stabilized, 5/8 In. X 30 Ft., Gold White
This Seachoice Double Braid Nylon Dock Line is durable and dependable, and helps a boater tie up securely and reliably when docking. This premium, ...
View full detailsSeachoice 42411 High Quality Dock Rope for Boating - Double-Braid MFP Dock Line, ⅜-Inch x 15 Feet, Blue/Black
Manufactured with modern machinery and synthetic materials offering superior strength and durability, this double-braided multifilament polypropyle...
View full detailsSeachoice Double Braided Dock Rope for Boating - 100% MFP Dock Line, ⅜-Inch x 15 Feet, White with Black Tracer
This Seachoice Double Braided 100% MFP Dock Line is durable and dependable, and helps a boater tie up securely and reliably when docking. This high...
View full detailsSeachoice 46981 Double-Braid Nylon Dock Line w/ Eye Splice, Pre-Shrunk, Heat Stabilized, 5/8 In. X 30 Ft., Forest Green
This Seachoice Double Braid Nylon Dock Line is durable and dependable, and helps a boater tie up securely and reliably when docking. This premium, ...
View full detailsSeachoice Premium 3-Strand Twisted Nylon Dock Line With Tracer, White w/Blue Tracer, 5/8-Inch x 25 Feet, 10-Inch Eye Splice
This Seachoice Premium 3-Strand Twisted Nylon Dock Line With Tracer is durable and dependable and helps ensure the most reliable docking. This 3-st...
View full detailsSeachoice Premium 3-Strand Twisted Nylon Dock Line With Tracer, White w/Blue Tracer, 3/8-Inch x 15 Feet, 10-Inch Eye Splice
This Seachoice Premium 3-Strand Twisted Nylon Dock Line With Tracer is durable and dependable and helps ensure the most reliable docking. This 3-st...
View full detailsSeachoice Premium 3-Strand Twisted Nylon Dock Line With Tracer, White w/Blue Tracer, 1/2-Inch x 20 Feet, 10-Inch Eye Splice
This Seachoice Premium 3-Strand Twisted Nylon Dock Line With Tracer is durable and dependable and helps ensure the most reliable docking. This 3-st...
View full detailsSeachoice Premium 3-Strand Twisted Nylon Dock Line With Tracer, White w/Blue Tracer, 3/8-Inch x 20 Feet, 10-Inch Eye Splice
This Seachoice Premium 3-Strand Twisted Nylon Dock Line With Tracer is durable and dependable and helps ensure the most reliable docking. This 3-st...
View full detailsSeachoice Premium 3-Strand Twisted Nylon Dock Line, White With Blue Tracer, 5/8" x 30'
Extremely strong rope with 10" eye splice. Designed to absorb sudden shock loads. Very good resistance to abrasion, rot, oils, gasoline and marine ...
View full detailsSeachoice Boat Anchor Line Rope, 3-Strand Twisted, Nylon, White with Blue Tracer, 1/2 In. X 15 Ft.
This Seachoice Premium 3-Strand Twisted Nylon Dock Line With Tracer is durable and dependable and helps ensure the most reliable docking. This 3-st...
View full detailsSeachoice Premium 3-Strand Twisted Nylon Dock Line With Tracer, White w/Blue Tracer, 3/8-Inch x 10 Feet, 10-Inch Eye Splice
This Seachoice Premium 3-Strand Twisted Nylon Dock Line With Tracer is durable and dependable and helps ensure the most reliable docking. This 3-st...
View full detailsSeachoice Premium 3-Strand Twisted Nylon Dock Line With Tracer, White w/Blue Tracer, 3/4-Inch x 25 Feet, 18-Inch Eye Splice
This Seachoice Premium 3-Strand Twisted Nylon Dock Line With Tracer is durable and dependable and helps ensure the most reliable docking. This 3-st...
View full detailsSeachoice High Quality Dock Rope for Boating - 3-Strand Twisted Nylon Line, ⅝-Inch x 30 Feet, White
This Seachoice 3-Strand Twisted Nylon Line is durable and dependable and ideal for use in harsh marine environments. This 3-strand white line is de...
View full detailsSeachoice Double-Braid Nylon Dock Line w/ Eye Splice, Pre-Shrunk, Heat Stabilized, 3/4 In. X 50 Ft., Gold White
This Seachoice Double Braid Nylon Dock Line is durable and dependable, and helps a boater tie up securely and reliably when docking. This premium, ...
View full detailsSeachoice High Quality Dock Rope for Boating - 3-Strand Twisted Nylon Line, ¾-Inch x 50 Feet, White
This Seachoice 3-Strand Twisted Nylon Line is durable and dependable and ideal for use in harsh marine environments. This 3-strand white line is de...
View full detailsSeachoice High Quality Dock Rope for Boating - 3-Strand Twisted Nylon Line, ⅝-Inch x 35 Feet, White
This Seachoice 3-Strand Twisted Nylon Line is durable and dependable and ideal for use in harsh marine environments. This 3-strand white line is de...
View full detailsSeachoice Double-Braid Nylon Dock Line w/ Eye Splice, Pre-Shrunk, Heat Stabilized, 3/4 In. X 35 Ft., Gold White
This Seachoice Double Braid Nylon Dock Line is durable and dependable, and helps a boater tie up securely and reliably when docking. This premium, ...
View full detailsSeachoice High Quality Dock Rope for Boating - 3-Strand Twisted Nylon Line, ¾-Inch x 35 Feet, White
This Seachoice 3-Strand Twisted Nylon Line is durable and dependable and ideal for use in harsh marine environments. This 3-strand white line is de...
View full detailsSeachoice High Quality Dock Rope for Boating - 3-Strand Twisted Nylon Line, ⅝-Inch x 20 Feet, White
This Seachoice 3-Strand Twisted Nylon Line is durable and dependable and ideal for use in harsh marine environments. This 3-strand white line is de...
View full detailsSeachoice High Quality Dock Rope for Boating - 3-Strand Twisted Nylon Line, ¾-Inch x 25 Feet, White
This Seachoice 3-Strand Twisted Nylon Line is durable and dependable and ideal for use in harsh marine environments. This 3-strand white line is de...
View full detailsSeachoice Double-Braid Nylon Dock Line w/ Eye Splice, Pre-Shrunk, Heat Stabilized, 3/4 In. X 50 Ft., Blue
This Seachoice Double Braid Nylon Dock Line is durable and dependable, and helps a boater tie up securely and reliably when docking. This premium, ...
View full detailsSeachoice 47221 Double-Braid Nylon Dock Line w/ Eye Splice, Pre-Shrunk, Heat Stabilized, 3/4 In. X 50 Ft., Black
This Seachoice Double Braid Nylon Dock Line is durable and dependable, and helps a boater tie up securely and reliably when docking. This premium, ...
View full detailsSeachoice 47311 Double-Braid Nylon Dock Line w/ Eye Splice, Pre-Shrunk, Heat Stabilized, 3/4 In. X 35 Ft., Blue
This Seachoice Double Braid Nylon Dock Line is durable and dependable, and helps a boater tie up securely and reliably when docking. This premium, ...
View full detailsSeachoice High Quality Dock Rope for Boating - 3-Strand Twisted Nylon Dock Line, ½-Inch x 25 Feet, White
Manufactured with modern machinery and synthetic materials offering superior strength and durability, this 3-strand twisted nylon dock line with 10...
View full detailsSeachoice High Quality Dock Rope for Boating - 3-Strand Twisted Nylon Line, ½-Inch x 30 Feet, White
This Seachoice 3-Strand Twisted Nylon Line is durable and dependable and ideal for use in harsh marine environments. This 3-strand white line is de...
View full detailsSeachoice High Quality Dock Rope for Boating - 3-Strand Twisted Nylon Line, ⅝-Inch x 25 Feet, White
This Seachoice 3-Strand Twisted Nylon Line is durable and dependable and ideal for use in harsh marine environments. This 3-strand white line is de...
View full detailsSeachoice High Quality Dock Rope for Boating - 3-Strand Twisted Nylon Dock Line, ½-Inch x 15 Feet, White
Manufactured with modern machinery and synthetic materials offering superior strength and durability, this 3-strand twisted nylon dock line with 10...
View full detailsSeachoice Double-Braid Nylon Dock Line w/ Eye Splice, Pre-Shrunk, Heat Stabilized, 3/8 In. X 20 Ft., Yellow
This Seachoice Double Braid Nylon Dock Line ensures the most reliable docking and tie-off security, and it is constructed to deliver consistently o...
View full detailsSeachoice Double-Braid Nylon Dock Line w/ Eye Splice, Pre-Shrunk, Heat Stabilized, 5/8 In. X 35 Ft., Navy Blue
This Seachoice Double Braid Nylon Dock Line is durable and dependable, and helps a boater tie up securely and reliably when docking. This premium, ...
View full detailsSeachoice Double-Braid Nylon Dock Line w/ Eye Splice, Pre-Shrunk, Heat Stabilized, 3/4 In. X 35 Ft., Black
This Seachoice Double Braid Nylon Dock Line is durable and dependable, and helps a boater tie up securely and reliably when docking. This premium, ...
View full details