A zinc shaft collar anode with a hydrodynamic shape, suitable for vessels with a 31.8mm diameter shaft.
Suitable for use in salt water, the naca profile zinc shaft anode is manufactured to US MIL Spec by Tecnoseal in Italy, one of the world's leading suppliers of sacrificial anodes for cathodic protection in the leisure boat market - ensuring high performance.
Every zinc anode sold by Anode Outlet is genuine and manufactured to the highest quality anode specification. Item(s) shown in image may not come in manufacturers' branded packaging due to production processes.
Also available in:
Aluminium - 00556AL.
Magnesium - 00556MG.
Tecnoseal Zinc Shaft Collar Anode Size Guide:
- Please refer to the diagram in the product photos for measurements.
- If you wish to navigate to a different anode in the list, simply click on the part number.
| Part Number | Ø1 (mm) | h (mm) | Ø (mm) | Weight (kg) |
| 00550 | 19 | 25 | 55 | 0.32 |
| 00550/1 | 20 | 25 | 55 | 0.26 |
| 00551 | 22 | 25 | 55 | 0.24 |
| 00552 | 25 | 25 | 55 | 0.23 |
| 00553 | 25.4 | 25 | 55 | 0.29 |
| 00554 | 28.60 | 25 | 66 | 0.27 |
| 00555 | 30 | 25 | 66 | 0.27 |
| 00556 | 31.80 | 25 | 66 | 0.26 |
| 00557 | 35 | 25 | 66 | 0.23 |
Useful Links:
Category: Explore our full range of shaft anodes.
Blog: How to fit shaft anodes.
Blog: How often should a sacrificial anode be replaced on a boat?
Blog: Aluminium versus zinc anodes.
