Martyr CMDIVERHZ Heavy Hull Plate Anode — Zinc | 1″ × 6″ × 12″ | Salt Water

Martyr CMDIVERHZ — Heavy Hull Plate Anode | Zinc | 1″ × 6″ × 12″ | Salt Water

Part Number: CMDIVERHZ (SKU: 194-CMDIVERHZ)
Brand: Martyr Anodes
Official Product Type: Heavy Hull Plate Sacrificial Anode — Zinc
Common Name: Diver’s Dream Heavy Hull Anode
Dimensions: 1″ × 6″ × 12″ (approx. 25.4 mm × 152 mm × 305 mm)
Supersedes: No known superseded number
Replaced By: CMDIVERHZ is the current active part number

The Martyr CMDIVERHZ is the heavy-duty zinc version of the Diver’s Dream hull plate anode — 1″ thick and built for vessels with high cathodic protection demands or extended intervals between diver service calls. The increased anode mass compared to the standard ½″ plate means significantly longer service life at each mounting position. Zinc alloy construction makes this the correct choice for salt water environments.

Compatible Applications

• Steel and aluminum boat hulls with high cathodic protection requirements in salt water
• Commercial vessels, workboats, and fishing vessels kept in the water year-round
• Vessels with extended haul-out intervals where longer anode life is needed
• Large hull surface areas requiring maximum anode mass per mounting position
• Salt water use only (see aluminum alternative for brackish water)

CMDIVERHZ vs CMDIVERHA — Zinc or Aluminum?

• Zinc (this anode — CMDIVERHZ): Salt water only. Traditional choice; specified by many marinas and classification societies.
• Aluminum (CMDIVERHA): Salt water & brackish water. More electrochemically efficient per kilogram — see Martyr CMDIVERHA Aluminum Heavy Hull Plate Anode

CMDIVERHZ vs CMDIVER — Which Thickness?

• CMDIVERHZ — 1″ thick (this anode): Double the anode mass, longer service life. Best for commercial use, high-demand applications, or extended intervals between diver inspections.
• Standard ½″ zinc plate: Suitable for most recreational vessels on regular haul-out schedules — see Martyr CMDIVER Hull Anode — Zinc (½″ × 6″ × 12″)

System & Location

Cathodic protection system — hull-mounted plate anode. Mounts flush to the hull below the waterline using through-bolts or studs. The flat profile minimizes drag while the 1″ thickness provides substantially more anode material than the standard ½″ version. Designed to be replaced in-water by a diver.

Kit Contents

• One (1) zinc heavy hull plate anode, 1″ × 6″ × 12″
• Mounting hardware not confirmed included — verify at time of order; reuse existing studs or through-bolts if not supplied

Dimensions & Weight

• Dimensions: 1″ × 6″ × 12″ (25.4 mm × 152 mm × 305 mm)
• Weight: Approx. 3,000 g / 6.6 lb (estimated — zinc is denser than aluminum)

Service Interval

Inspect at every haul-out or have a diver inspect at least annually if the vessel is kept in the water. Replace when the anode has been consumed to approximately 50% of its original mass. The 1″ thickness provides significantly more service life than the standard ½″ plate before reaching the replacement threshold. Exact depletion rate depends on water conditions, current density, and the amount of bare metal being protected.

Installation Notes

• Mount flush to the hull using through-bolts or studs — ensure direct metal-to-metal contact between the anode and the hull
• Do not apply paint, bedding compound, or sealant between the anode and the hull surface
• Bare metal contact is essential for the anode to function correctly
• Torque fasteners securely — a loose anode will not make proper electrical contact and may be lost underway
• Use zinc anodes in salt water only — zinc does not perform correctly in brackish or fresh water

Technical FAQ

Q: What is the difference between CMDIVERHZ and CMDIVERHА?
Both are 1″ × 6″ × 12″ heavy hull plate anodes. The CMDIVERHZ is zinc (salt water only); the CMDIVERHA is aluminum (salt and brackish water). Aluminum is more electrochemically efficient per kilogram, but zinc is the traditional specification at many marinas and shipyards.

Q: Why choose the 1″ heavy version over the standard ½″?
The 1″ version contains approximately twice the anode material, providing a longer service life before replacement is needed. This is most valuable on commercial vessels, vessels with extended haul-out intervals, or any application where maximizing time between diver service calls is a priority.

Q: Can this anode be used in brackish or fresh water?
No. Zinc anodes are for salt water use only. For brackish water, use the aluminum version (CMDIVERHA). For fresh water, a magnesium anode is required.

Q: How many anodes does my hull need?
The number and total mass of hull anodes required depends on hull material, surface area of bare metal, and water conditions. A marine surveyor or corrosion specialist can calculate the correct anode system for your vessel.

Related Parts

• Martyr CMDIVERHA — Aluminum Heavy Hull Plate Anode, 1″ × 6″ × 12″
• Martyr CMDIVER — Zinc Hull Plate Anode, ½″ × 6″ × 12″ (Standard)
• Martyr CMDIVERA — Aluminum Hull Plate Anode, ½″ × 6″ × 12″ (Standard)

Parts Desk Insights

The CMDIVERHZ is the heavy-duty zinc hull anode for operators who need maximum service life between diver visits. The most common use case is commercial fishing vessels and workboats that stay in the water for extended periods — the extra anode mass pays for itself in reduced diver service frequency. For recreational boats on a regular annual haul-out, the standard ½″ zinc plate is usually sufficient. If the vessel operates in both salt and brackish water, the aluminum version (CMDIVERHA) is worth considering as it covers both environments and offers better efficiency per kilogram of anode material.