Sea-Dog Open Base Cleat, 4 Inch Black Nylon Boat Cleat with #8 Fastener Holes

The Sea-Dog Open Base Cleat (043040-1) is a 4 inch black nylon dock cleat designed for securing dock lines, mooring lines, and fenders on boats and docks. It is built from injection molded nylon that resists corrosion and UV degradation, making it suitable for long-term exposure to sun, saltwater, and freshwater environments. The defining feature of this cleat is its open base with a molded-in recess that traps sealant in place during installation, creating a more watertight seal around the mounting fasteners and helping prevent water intrusion into the deck or hull core.

This cleat measures 4 inches in overall length with a height of 7/8 inch, giving it a compact footprint suitable for smaller boats, docks, kayaks, canoes, and utility applications where a full-size bow or stern cleat is not needed. It installs using two flat head fasteners sized for a #8 screw (fasteners are not included and must be purchased separately). The cleat is finished in black to blend with dark trim, rails, and non-skid surfaces. It ships as a single cleat, and Sea-Dog also offers this same open base cleat design in additional sizes for larger line diameters and heavier-duty applications.

Specifications

• Brand: Sea-Dog
• Manufacturer Part Number: 043040-1
• Product Type: Open Base Cleat
• Material: Injection Molded Nylon
• Color: Black
• Length: 4 inches
• Height: 7/8 inch
• Fastener Size: #8 Flat Head (fasteners not included, 2 required)
• Weight: 0.088 pounds
• Standard Pack: 10 pieces
• UPC: 035514043090

Frequently Asked Questions

What size is the Sea-Dog 043040-1 open base cleat? The Sea-Dog 043040-1 open base cleat measures 4 inches in overall length and 7/8 inch in height, making it a compact cleat suited to smaller boats and dock applications.

What material is this cleat made from? This cleat is made from injection molded nylon that resists corrosion and UV damage, which is why Sea-Dog uses it for the 043040-1 open base cleat rather than metal.

What does 'open base' mean on this cleat? Open base refers to a molded-in recess in the base of the 043040-1 cleat that traps sealant in place during mounting, giving a more watertight seal around the fastener holes than a flat-base cleat.

What fasteners does the 043040-1 cleat require? Two #8 flat head fasteners are needed to install the Sea-Dog 043040-1 cleat; fasteners are not included and must be purchased separately.

Is this cleat sold as a single piece or a pair? The 043040-1 is sold as a single black cleat, though it is packed in standard quantities of 10 pieces at the distributor level.

Does Sea-Dog make this cleat in white? Yes, Sea-Dog produces this same 4 inch open base cleat design in white as a separate part number in addition to the black 043040-1.

How much does this cleat weigh? The Sea-Dog 043040-1 open base cleat weighs 0.088 pounds.

What is this cleat used for? The 043040-1 is used to secure dock lines, mooring lines, and fenders on boats, docks, kayaks, and other small watercraft or dock structures.

Is this cleat UV and saltwater resistant? Yes, the nylon construction of the 043040-1 open base cleat is corrosion and UV resistant, making it suitable for continuous exposure to sun and marine water.

Does Sea-Dog offer larger versions of this same cleat? Yes, the open base cleat design used for the 4 inch 043040-1 is also available from Sea-Dog in other lengths for applications needing a larger cleat.

What is the UPC for the Sea-Dog 043040-1 cleat? The UPC for the Sea-Dog 043040-1 black 4 inch open base cleat is 035514043090.