Bolt On Hull Anodes
Harbor Zinc Anodes meet military specification MIL-A-18001K, MIL-DTL-18001L and ASTM B 418 Type 1 alloy. HARBALUM Aluminum Anodes conform to MIL-A-24779 alloy.
Zinc and aluminum anodes are generally used in salt and brackish waters where resistivity is generally lower. Typical uses are for the hulls of vessels, offshore pipelines, seawalls, pilings, production platforms, in marine heat exchangers, on boat propellers and rudders.
Aluminum anodes have several advantages, such as a lighter weight and higher capacity than zinc. However, their electrochemical behavior is not considered as reliable as zinc in lower levels of brackish waters, and greater care must be taken in how they are used. Aluminum anodes may passivate where chloride concentration is low.
Anodes are necessary because galvanic corrosion occurs when metals of different potentials are electrically attached in marine environments. “Harbor” sacrificial anodes can be manufactured for a variety of installation methods of bolt-on, weld-on or screw-on styles. In addition to these, Harbor Anodes can be cast to custom-sized requirements. Please contact us for advice on optimizing an anode to suit your specific requirements
| ZINC PART | ALUM PART | STYLE | DIMENSIONS (INCHES) | CORE (INCHES) | HOLE CENTERS | ZINC LBS | ALUM LBS |
| ZHC-42 | AHC-16 | bolt on | 2.5 x 6 x 12 | .25 x 1.5 x 8 | 6" | 42 | 16 |
| ZSC-24 | ASC-11 | bolt on | 1.25 x 3 x 24 | .25 x 1.5 x 15 | 12" | 24 | 11 |
| ZHC-23 | AHC-10 | bolt on | 1.25 x 6 x 12 | .25 x 1.5 x 8 | 6" | 23 | 10 |
| ZSC-12 | ASC-5 | bolt on | 1.25 x 3 x 12 | .25 x 1.5 x 8 | 6" | 12 | 5 |
| ZHN-20 | AHN-8 | solid plate | 1 x 6 x 12 | - | - | 20 | 8 |
| ZHN-10 | AHN-4 | solid plate | .5 x 6 x 12 | - | - | 10 | 4 |
| ZHC-10 | AHC-4 | 2 slotts | .625 x 6 x 12 | .5 x 3.75 slots | 2.25" - 8.7" | 10 | 4 |
| Z-10 | - | 3 "T" slotts | .625 x 6 x 12 | .5 x 2 slot | 2" - 7" OC slots | 10 | - |
| ZHC-5 | - | 2 slotts | .625 x 4 x 8 | .5 x 2.5 slotts | 2.25" - 6.25" | 5 | - |
| ZHC-5R | - | 2 slotts | .625 x 4 x 9 | .5 x 2.5 slotts | 2.75" - 6.75" | 5 | - |
| ZSC-20 | ASC-8 | 3 holes | 2 x 3 x 17.5 | .18 x 1.25 x 13 | 3 holes, 5.37" | 20 | 8 |
| ZSC-10 | ASC-4 | 3 holes | 1 x 3 x 14 | .18 x 1.25 x 13 | 3 holes, 5.37" | 10 | 4 |
| R3-P3 | - | bar | .25 x 2 x 36 | - | optional | 5 | - |
| ZTB-5 | - | bolt on | .75 x 4 x 8 | .188 x 1.25 | 4.37" | 5 | - |
| ZTB-3 | - | bolt on | .75 x 2.75 x 5.75 | .188 x 1.25 | 2.87" | 3 | - |
| - | AHC-33 | bolt on | 2.25 x 5 x 29.75 | no core | 1.87" dia, 13" oc | - | 33 |
