Sierra 18-6249 Zinc Anode for Mercury/Mariner 175HP/150EFI/200EFI Transom Mount Bracket, Replaces 43396A2

The Sierra 18-6249 is a zinc sacrificial anode engineered for the transom mount bracket on Mercury/Mariner outboard motors. Sacrificial anodes protect the more critical metal components of an outboard's lower unit and mounting hardware from galvanic corrosion by corroding themselves first, giving the surrounding aluminum and steel parts a longer service life in saltwater and freshwater environments alike. This anode is specifically designed for transom mount bracket applications on 175HP, 150EFI, and 200EFI Mercury/Mariner outboards with serial numbers OG303046 and up.

Constructed from zinc, the 18-6249 is the standard corrosion-protection alloy choice for saltwater use, offering reliable, consistent sacrificial performance over the anode's service life. It is a direct-fit replacement for the OEM Mercury Marine anode it supersedes, and it should be inspected periodically and replaced once it has corroded to roughly half its original mass to maintain effective protection for the transom mount bracket assembly.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-6249
• Material: Zinc
• Weight: 1.37 pounds
• Mounting Type: Transom Mount
• Fitment: Mercury/Mariner 175HP/150EFI/200EFI (S/N OG303046 & Up)
• Maximum Horsepower: 200 Horsepower
• UPC: 808282103637

Fitment

• Mercury/Mariner transom mount bracket
• 175HP
• 150EFI
• 200EFI
• S/N OG303046 & Up

Replaces (OEM)

• 43396A2
• 818298A1
• 818298Q1

Frequently Asked Questions

What does the Sierra 18-6249 anode fit? The Sierra 18-6249 is designed for the transom mount bracket on Mercury/Mariner outboards rated 175HP, 150EFI, and 200EFI with serial numbers OG303046 and up.

What material is the 18-6249 anode made of? It is made of zinc, the standard sacrificial anode alloy used to protect outboard metal components from galvanic corrosion.

Which OEM part numbers does the Sierra 18-6249 replace? It replaces Mercury Marine part numbers 43396A2, 818298A1, and 818298Q1.

How much does the 18-6249 anode weigh? The Sierra 18-6249 weighs 1.37 pounds.

Is the Sierra 18-6249 a genuine Sierra part or aftermarket? The 18-6249 is manufactured by Sierra as a direct replacement for the corresponding Mercury Marine transom mount bracket anode, sold under Sierra's own part number.

Where on the outboard does this anode install? The 18-6249 mounts on the transom mount bracket of the outboard, not on the lower unit or trim tab.

How do I know when to replace this anode? A zinc anode like the 18-6249 should be replaced once it has corroded to about half of its original size, since a heavily depleted anode can no longer adequately protect the surrounding metal.

Does the Sierra 18-6249 come in a different material option? Sierra offers this transom mount bracket anode in zinc under part number 18-6249; an aluminum version is sold under a separate part number.

Will the 18-6249 fit outboards below serial number OG303046? This anode is specified for Mercury/Mariner 175HP/150EFI/200EFI units with serial numbers OG303046 and up; earlier serial numbers are not covered by this listing.

Is the Sierra 18-6249 suitable for saltwater use? Yes, zinc anodes such as the 18-6249 are the recommended sacrificial anode material for saltwater applications.