T-H Marine 3/8 in x 15 ft Solid Braid Dock Line

This is T-H Marine's solid braid dock line, built from premium multi-filament polypropylene and sized at 3/8 inch by 15 feet. It's the kind of line you buy a few of and then forget about, because it just does its job. Tie off at the slip, cleat down at a transient dock, or keep a spare coiled in the locker. Black, soft in the hand, and ready to work the day it comes out of the bag.

Multi-filament polypropylene, or MFP, is a great all-around rope for dock duty. It's woven from thousands of fine fibers, so it feels soft and flexible instead of stiff and scratchy. That matters when you're handling line with cold, wet hands. MFP also floats, which is a real advantage around a boat. A line that floats stays on the surface instead of sinking down toward your prop or wrapping your running gear. Drop a loop in the water reaching for a piling and it sits right there waiting for you.

The solid braid construction is smooth and round. It won't hockle or kink the way cheap twisted rope does, it runs clean through a chock, and it lies flat on the deck instead of fighting you into a tangle. Solid braid also resists snagging on splintered pilings and rough concrete dock edges.

Now the numbers. This line carries a 950 pound breaking strength and a 190 pound safe working load. Those two figures aren't the same thing, and the difference matters. Breaking strength is the point where the rope actually fails in a lab pull. Safe working load is what you should plan around day to day, set at a conservative margin well below the breaking point. For a dock line that's exactly what you want. You're not trying to use every pound of strength. You want a comfortable cushion so wind gusts, wakes, and tide swings never load the line anywhere near its limit.

The 3/8 inch diameter is the sweet spot for a lot of boats. It's a common dock line size for runabouts, bay boats, center consoles, and smaller cruisers. Thick enough to grip and hold a good knot, thin enough to handle easily and stow without eating up your whole locker. The 15 foot length suits most finger piers and standard slips. If you keep your boat somewhere with a big tidal range, measure your rise and fall and step up the length so you've got slack to work with at low water.

Each line comes with a 12 inch spliced eye on one end. That factory eye is a real time saver. Drop it over a piling or a dock cleat, run the standing end back to the boat, and you're tied off in seconds without fussing over a knot in the dark. The splice is clean and holds the rope's strength far better than a knot does, since knots always weaken a line where they bite.

T-H Marine built this one to live outside. It's UV resistant, so it won't go brittle and chalky after a season baking in the sun the way untreated rope does. It's abrasion resistant for the constant rubbing against dock edges, cleats, and chocks. And it shrugs off the chemical splashes that are part of dock life, including fuel, oil, cleaners, and salt. The black color hides the grime and grease that would show up fast on a white line.

A couple of honest notes. MFP doesn't stretch as much as nylon, so it won't absorb a shock load quite the same way. In a calm slip that's a non-issue. But if you're tied up somewhere with a steady chop or boat wakes rolling through, add a line snubber or a section of give to take the snatch out of the system and save your cleats. And wherever the line crosses a hard edge, slip a piece of chafe guard or an old hose over it. Chafe is what ends a dock line's life, not age.

Figure on four lines for a basic setup, two at the bow and two at the stern, plus a couple of spring lines if your slip calls for them. Buying a matched set in the same size and color keeps your rigging looking squared away and means every line handles the same. Rinse them with fresh water now and then, let them dry, and this line will give you years of quiet service.