Older dock and boat cleats are not identified reliably by length alone. Sea-Dog offers galvanized cast-iron, moulded nylon and die-cast aluminum styles with different open- or closed-base designs. Compare the original number, mounting-hole arrangement and the full manufacturer's measured length before choosing a replacement.
Recognize the base and metal finish
The 040-series uses hot-dip-galvanized cast iron. It is intended for smaller recreational boats and docks rather than commercial or large-vessel mooring.
The 043-series is corrosion- and UV-resistant injection-moulded nylon; a moulded underside recess holds bedding sealant.
046106 has a closed base, while 046110 has an open base. Both use die-cast aluminum and flat-head fasteners.
Sea-Dog numbers and actual cleat lengths
The length is the manufacturer's overall A dimension, not necessarily the spacing between holes.
| 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.
Inspect the original mounting
Inspect the underside of the original cleat, the number and location of the mounting holes, any backing plate and deck or dock deterioration. Check whether the body is cracked or corroded and measure the full horn-to-horn length. A nylon cleat is not an assumed load-for-load replacement for a galvanized iron cleat of similar size.
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.
A 040103 is catalogued at 3½ inches overall even where some listings shorten the size to three inches.
Open the matching Sea-Dog part
Choose the original number to review its listing, condition information and availability.
Sea-Dog 040103
Identify this 3½ in galvanized iron cleat by its open mounting base.
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Sea-Dog 040104
Identify this 4 in galvanized iron cleat by its open mounting base.
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Sea-Dog 040105
Identify this 5 in galvanized iron cleat by its open mounting base.
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Sea-Dog 040106
Identify this 6 in galvanized iron cleat by its open mounting base.
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Sea-Dog 040110
Identify this 10 in galvanized iron cleat by its open mounting base.
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Sea-Dog 040112
Identify this 12 in galvanized iron cleat by its open mounting base.
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Sea-Dog 043040
Identify this 4 in black nylon cleat by its open; sealant recess mounting base.
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Sea-Dog 043050
Identify this 5 in black nylon cleat by its open; sealant recess mounting base.
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Sea-Dog 046106
Identify this 6 in die-cast aluminum cleat by its closed mounting base.
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Sea-Dog 046110
Identify this 10 in die-cast aluminum cleat by its open mounting base.
Check cleat listing and availabilityOther cleats and deck fittings
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