Boat Mooring Cleats, Fenders and Dock Bumpers

Cleats, hooks and rope: size them as a set

Cleats, hooks and rope belong together, so size them as a set. A cleat should be long enough for several turns and a locking hitch, so larger boats and heavier line need a longer cleat. Slide anchor hooks and similar fittings list the rope diameter range they accept and a load rating, which should comfortably exceed the loads from wind and waves. Stainless steel resists corrosion, while polished aluminum is lighter. Fasten cleats through the deck with backing plates or large washers, not just screws into the surface.

Fenders and bumpers: protect the hull where it touches

Fenders protect the hull from docks and other boats, and are sized by the boat's length and weight: bigger boats need bigger fenders. Twin-eye fenders have an eye at each end, so they can hang vertically or lie horizontally, while piling bumpers wrap a dock post to prevent scrapes and are specified by length and post diameter. Choose UV-stable vinyl, and keep the fender properly inflated, because a soft fender gives little protection. Hang them at the widest part of the hull, with at least two or three a side.

Questions about Boat Mooring Cleats, Fenders and Dock Bumpers

What size fender do I need?

Use the maker's sizing chart, which matches fender diameter to boat length and weight. Heavier boats, high sides and rough docks call for larger fenders. Hang at least two or three per side at the widest part of the hull, and keep them inflated.

How do I secure a line to a cleat?

Take a full turn around the base, make figure-eight turns across the horns, then finish with a locking hitch so the line can be released under load. Leave a little slack to allow for changes in water level.

Stainless steel or aluminum cleat?

Stainless steel is stronger and resists corrosion but is heavier. Polished aluminum is lighter and common on small boats, with lower strength. Match the cleat to the line and the load, and check the fastener material to avoid galvanic corrosion.