Boat Dock Lines & Rope

Select diameter based on boat length and weight—small boats often use 3/8"–1/2", mid-size boats 5/8"–3/4", and larger vessels 7/8" or more; choose length to allow proper spring, bow, and stern lines (commonly 15–30 feet per line depending on dock layout)

Polypropylene is lightweight and floats but less UV- and abrasion-resistant; nylon stretches and absorbs shock well but can retain water and is heavier; polyester offers low stretch, good UV and abrasion resistance, and is often preferred for general dock use

Dock lines range from budget options under $50 for basic lengths to $50–$150 for higher-quality ropes and assemblies; specialty or heavy-duty custom lines can cost more, with average prices falling in the mid-range

Pre-spliced lines save time and offer professional terminations ready to use, while cut rope is cheaper and allows custom lengths and splicing if you have the skills and tools; choose pre-spliced for convenience and cut rope if you need custom solutions

Rinse lines with fresh water after exposure to salt or dirt, allow them to dry fully before storage, inspect regularly for chafe or UV damage, and replace lines with visible wear or compromised integrity

Check minimum breaking strength and working load limits appropriate for your boat—manufacturers typically provide breaking strength in pounds or kilograms; choose a rope with a safety margin several times the static load expected from wind, current, and boat weight

Use multiple lines (bow, stern, and springs) to control movement, avoid tying knots that significantly weaken rope if splices are available, keep lines clear of propellers and walkways, and use chafe guards where lines pass over edges