Sierra 18-6046 Marine Rudder Anode - Zinc, 2-13/16 Inch Diameter, Saltwater Use

The Sierra 18-6046 Marine Rudder Anode is a zinc sacrificial anode designed to protect a boat's rudder and underwater metal components from galvanic corrosion. Made of zinc, this anode is intended for saltwater applications only, where zinc provides the correct level of galvanic protection for submerged hardware. The anode measures 2 13/16 inch (71 mm) across the A-Diameter and 1/2 inch (13 mm) at Dimension B, sizing it for direct fit-and-replace service on compatible rudder hardware. Each package includes one rudder anode.

As a sacrificial anode, the 18-6046 corrodes preferentially in place of the boat's rudder and other metal fittings, extending the service life of the protected components. Regular inspection and replacement of the anode as it wears down helps maintain continuous corrosion protection. Sierra states that this part meets or exceeds the original equipment part it replaces.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-6046
• Material: Zinc
• Application: Saltwater use only
• A-Diameter: 2 13/16 inch (71 mm)
• Dimension B: 1/2 inch (13 mm)
• Weight: 1.07 pounds
• Finish: Brushed
• Package Quantity: 1 rudder anode per package
• UPC: 030999564177

Fitment

Fits applications requiring a rudder anode with a 2 13/16 inch A-Diameter and 1/2 inch Dimension B; consult your rudder hardware dimensions to confirm compatibility.

Replaces (OEM)

No specific OEM cross-reference numbers are listed for this part.

Frequently Asked Questions

What is the Sierra 18-6046 rudder anode made of? The Sierra 18-6046 Marine Rudder Anode is made of zinc, which is the standard sacrificial anode material for saltwater use.

Is the 18-6046 rudder anode for freshwater or saltwater boats? Zinc anodes like the Sierra 18-6046 are intended for saltwater applications only; freshwater boats require a different anode material to provide proper galvanic protection.

What size is the Sierra 18-6046 rudder anode? It measures 2 13/16 inch (71 mm) at the A-Diameter and 1/2 inch (13 mm) at Dimension B.

How much does the 18-6046 rudder anode weigh? The Sierra 18-6046 Marine Rudder Anode weighs 1.07 pounds.

How many anodes come in a package? One rudder anode is included per package of part number 18-6046.

How do I know when to replace this rudder anode? A sacrificial anode such as the 18-6046 should be replaced once it has corroded down to roughly half its original size, since it is protecting the rudder and other metal components by corroding in their place.

Does the Sierra 18-6046 meet OEM specifications? Sierra states that the 18-6046 rudder anode meets or exceeds the original equipment part it replaces.

Why is my rudder anode made of zinc instead of another metal? Zinc is used on the 18-6046 because it is the correct anode material for saltwater environments, providing effective galvanic corrosion protection in that setting.

What does Dimension B refer to on the 18-6046 anode? Dimension B is a secondary measurement of 1/2 inch (13 mm) on the Sierra 18-6046 rudder anode, used along with the A-Diameter to confirm fit.

Can this anode be used on components other than a rudder? The Sierra 18-6046 is designated as a rudder anode sized to a 2 13/16 inch A-Diameter and 1/2 inch Dimension B; check your specific hardware dimensions before using it elsewhere.

What finish does the 18-6046 anode have? The Sierra 18-6046 rudder anode has a brushed finish.