Most propeller shafts are at least partially isolated from other parts of the vessel due to the electrical resistance because of the shaft’s distance from the propeller to other hull anodes, thereby requiring it’s own anode to provide maximum protection.
COMMERCIAL PROPELLER NUT CAP ZINC ANODES
| ZINC PART | ID (INCHES) | OD (INCHES) | OUTSIDE LENGTH | NOMINAL LBS |
| NO. A | 2 | 2.75 | 2.75 | 2.25 |
| NO. B | 2.25 | 3 | 3 | 2.5 |
| NO. 1 | 2.5 | 3.375 | 3.375 | 4.25 |
| NO. 2 | 2.875 | 3.75 | 3.75 | 5 |
| NO. 3 | 3.25 | 4.125 | 4.25 | 6.75 |
| NO. 4 | 3.75 | 4.625 | 4.375 | 7.25 |
| NO. 5 | 4.25 | 5.125 | 4.75 | 10.25 |
| NO. 6 | 4.625 | 5.625 | 5.25 | 11.5 |
| NO. 7 | 5 | 6 | 5.75 | 14.25 |
| NO. 8 | 5.5 | 6.56 | 6.125 | 18.25 |
| NO. 9 | 6 | 7.06 | 6.5 | 22 |
| NO. 10 | 6.5 | 7.5 | 7 | 30 |
| NO. 11 | 7 | 8.125 | 8 | 31 |
| NO. 12 | 7.5 | 8.5 | 8.75 | 41 |
| NO. 13 | 8.5 | 10 | 11.5 | 89 |
| NO. 14 | 9.5 | 11 | 11.5 | 103 |
| NO. 15 | 10.75 | 12.75 | 12 | 161 |
| NO. 17 | 12 | 14 | 12.5 | 189 |
| NO. 18 | 13.35 | 16.25 | 12 | 234 |
PLEASURE CRAFT ZINC CAPS
| ZINC PART | THREAD (INCHES) | SHAFT (INCHES) | OD (INCHES) | SPARE LBS | COMPLETE LBS |
| PN-A | 1/2 NC | 0.75 | 1.25 | 0.2 | 0.34 |
| PN-B | 5/8 NC | 0.875 | 1.625 | 0.5 | 0.82 |
| PN-C | 3/4 NC | 1 | 2 | 1.06 | 1.55 |
| PN-D | 7/8 NC | 1.25 | 2.31 | 1.5 | 2.2 |
| PN-E | 1 NC | 1.375 | 2.5 | 1.7 | 2.55 |
| PN-F | 1-1/8 NC | 1.5 | 2.75 | 2 | 3.2 |
| PN-G | 1-1/4 NC | 1.75 | 3.125 | 3.2 | 4.6 |
| PN-H | 1-1/2 NC | 2 | 3.375 | 3.6 | 5.75 |
Zinc
Brass
Maxi Prop Anodes
| ZINC PART | DIMENSIONS (INCHES) | BOLT |
| ZMP-63 | 1.75 high x 1.56 ID, 3 holes, 1.8" on center | 0.75 |
| ZMP-70 | 1.85 high x 1.63 ID, 3 holes, 1.99" on center | 1.12 |
| ZMP-83 | 2.37 high x 1.81 ID, 3 holes, 2.37" on center | 2 |
| UNIVERSAL 63mm | 6 holes, 1.0" on center | 0.63 |
| UNIVERSAL 70mm | 6 holes, 1.1" on center | 0.88 |
| UNIVERSAL 83mm | 6 holes, 1.3" on center | 1.88 |
ZMP-63/70/83
Universal 70
Universal 63
Universal 83
BENETAU ZINC CAPS
| ZINC PART | DIMENSIONS (INCHES) | NOMINAL LBS |
| B-22/25 | 22/25 mm zinc | 0.35 |
| B-22/25C | zinc and brass | 0.6 |
| B-30 | 30 mm zinc | 0.7 |
| B-30C | zinc and brass | 1.25 |
| B-35 | 35 mm zinc | 0.8 |
| B-35C | zinc and brass | 1.4 |
| B-40 | 40 mm zinc | 1.25 |
| B-40C | zinc and brass | 2.25 |
| B-45 | 45 mm zinc | 2 |
| B-45C | zinc and brass | 3.5 |
