Sea-Dog Boat & Dock Cleats: Material, Length & Mounting Guide

Sea-Dog offers fixed cleats in galvanized cast iron, black nylon and die-cast aluminum. The materials, base shapes and required fasteners vary by model, even at the same nominal length. This reference compares ten exact part numbers for recreational boat and dock hardware so you can select a matching cleat and plan its mounting.

How the three cleat constructions differ

Galvanized cast iron

Open-base 040-series cleats are designed for smaller recreational boats and docks; Sea-Dog excludes large boats and commercial applications.

Injection-moulded nylon

Black 043-series cleats resist UV and corrosion and include a recess in the underside to help retain sealant.

Die-cast aluminum

The 6-inch 046106 has a closed base; 10-inch 046110 has an open base. Both are designed for suitable aluminum dock and vessel surfaces.

Sea-Dog boat and dock cleat size comparison

Dimensions below are Sea-Dog's nominal overall lengths. The fastener entries are manufacturer installation references, not a promise that the fasteners are included.

MPN Construction Overall length Base Fastener reference
040103 Galvanized iron 3½ in Open #8 flat-head
040104 Galvanized iron 4 in Open #10 flat-head
040105 Galvanized iron 5 in Open Confirm fitting drawing
040106 Galvanized iron 6 in Open ¼ in socket-head
040110 Galvanized iron 10 in Open ⅜ in socket-head
040112 Galvanized iron 12 in Open ⅜ in socket-head
043040 Black nylon 4 in Open; sealant recess #6 flat-head
043050 Black nylon 5 in Open; sealant recess #10 flat-head
046106 Die-cast aluminum 6 in Closed ¼ in flat-head
046110 Die-cast aluminum 10 in Open 5/16 in flat-head

Flat-head and socket-head refer to fastener-head styles. Fasteners are not included. Confirm the installation drawing for 040105 before drilling or replacing its fasteners.

Fit and safe mooring considerations

Choose suitable through-fasteners and backing support for the structure and intended mooring loads. The galvanized 040103–040105 models use flat-head holes, while 040106 and the larger galvanized versions use socket-head locations. Use corrosion-appropriate fasteners, follow the current fitting drawing and seal penetrations where needed.

Select for the intended vessel and loads

Sea-Dog does not recommend the galvanized 040-series open-base models for large vessels or commercial applications. Confirm the required line size, structure, mounting and any applicable mooring hardware rating before substituting a cleat.

The 040103 manufacturer's published length is 3½ inches, not an exact three inches. Size and hole-spacing measurements should come from the specified model drawing.

Sea-Dog cleats by length and material

Choose a model to review its product details and current warehouse availability.

Related marine mounting guides

Attwood pull-up and retractable cleats · Sea-Dog stainless rail bases

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