Prop Nut Zinc Anode, Size B, 7/8" Shaft Diameter
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Sea Shield Marine Prop Nut Zinc Anode, Size B, 7/8" Shaft Diameter
Keep your propeller shaft and propeller fully protected with the Sea Shield Marine Prop Nut Zinc Anode, Size B (NUT ZINC-B). Designed for 7/8" shaft diameters, this replacement zinc anode fits over the corresponding bronze shaft nut installed at the end of your propeller shaft, forming a tight sacrificial barrier against galvanic corrosion. A cast-in stainless steel mounting insert provides a positive electrical ground connection and prevents the anode from loosening—even as the zinc material is actively being consumed.
All Sea Shield zinc prop nut anodes conform to military specification MIL-A-18001 for uncompromising cathodic protection in salt water. Manufactured in California, USA, this anode is engineered specifically for use with an adapter assembly that threads directly onto the shaft, making installation and future replacements fast and tool-friendly. Regularly replacing prop nut anodes is one of the most cost-effective maintenance steps a boat owner can take, significantly extending the service life of both the propeller and shaft. Suitable for use on inboard shafts, sterndrives, and outboard applications wherever a Size B prop nut is installed.
Key Features
- Zinc
- Mil-Spec: MIL-A-18001
- For use in: Salt Water
- Shaft Diameter: 7/8"
- Made in: USA
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