The size and type of line you use will depend on a number of factors including the size and weight of your boat. In general, lengths for fore and aft dock lines are usually two-thirds of the boat length, and spring lines are usually equal to the length of the boat. The Size Selection Guide provides a guideline for selecting the right diameter line.
| Boat Length | Dock Line | Anchor Line | |
|---|---|---|---|
| Up to 20' | 3/8" | 3/8" | |
| 20'-30' | 1/2" | 1/2" | |
| 30'-35' | 1/2" | 1/2" | |
| 35'-40' | 1/2" | 5/8" | |
| 40'-45' | 5/8" | 3/4" | |
| 45'-55' | 5/8" | 7/8" | |
| 55'-65' | 3/4" | 1" |