T-H Marine 1/2 in. x 25 ft 3-Strand Nylon Dock Line

A dock line is one of those things you don't think about until the wind picks up at 2 a.m. and your boat's grinding against the dock. This one is built to keep that from happening. It's a 1/2-inch, 25-foot length of premium white nylon, twisted in the classic 3-strand pattern that generations of boaters have trusted for tie-off duty. The finished end comes with a 12-inch pre-spliced eye, so you're ready to loop over a cleat or piling the moment it's out of the bag.

Why nylon? Because it stretches, and on a dock line that's exactly what you want. When a wake rolls through or a gust leans on the hull, the line gives a little and pulls the shock out of the load instead of transferring it straight to your cleats and their backing plates. Twisted 3-strand construction adds to that. It's forgiving in the hand, easy to splice or re-splice, and it lays out without the memory kinks you get from stiffer rope. The three strands also wear evenly, so a scuff on the dock edge chews through one strand at a time rather than cutting the whole line at once.

The pre-spliced eye is the part you'll appreciate every time you come in. It's a clean 12-inch loop, factory-spliced so it holds its shape and strength without you tying a single knot. Drop it over the horn of a dock cleat, or feed it around a piling and back through itself, and cleat off the bitter end at the boat. No fumbling with a bowline in the dark. The loop is sized to fit standard dock hardware without being so big it slips around.

At 1/2-inch diameter, this line is right at home on mid-size boats. As a general rule, boaters run 1/2-inch dock line on hulls in the mid-20s to mid-30s range, where you want more holding power and abrasion resistance than a lighter 3/8-inch line gives you. The 25-foot length covers most bow, stern, and spring line duties at a typical slip, and it's a sensible length to keep aboard as a spare or a storm line. Pontoon, runabout, center console, cuddy, it earns its keep across the board.

Two numbers matter on any line, and this one lists both honestly. Breaking strength is 5,670 pounds, which is the point where the line ultimately fails in a straight pull. Safe working load is 1,134 pounds, and that's the number you should actually plan around. The gap between the two is your safety margin, and it's there on purpose. Cordage loses strength over time from UV, chafe, and repeated shock loading, so you never want to load a line anywhere near its breaking point. Rig to the working load and you've got room to spare when conditions turn.

T-H Marine built this line to live outside. The nylon resists UV and sunlight, so it won't get brittle and chalky after a season in the weather the way cheaper cordage does. It shrugs off saltwater, and the tight twist stands up to the abrasion that comes with rubbing a dock edge or a rough piling day after day. Give it a freshwater rinse now and then to flush out salt and grit, coil it loosely when it's stowed, and it'll take care of your boat for a long time.

One line rarely does the job. Most boaters keep at least four aboard, a bow line, a stern line, and two spring lines that stop the boat from surging fore and aft in the slip. Matching your whole set to the same 1/2-inch nylon keeps the stretch and holding behavior consistent all the way around, which makes the boat sit quieter and more predictably at the dock. A good set of dock lines is cheap insurance, and this is a solid one to build around.