Zinc Propeller Nut Anode B CMT-PNZB

The Martyr CMT-PNZB is a zinc replacement propeller nut anode in the B-style pattern, designed to help protect propeller shafts and propellers from galvanic corrosion in saltwater service. Current product references identify it as the replacement anode only, not a complete assembled prop nut kit.

Key Features

Martyr part number: CMT-PNZB / CMPNZB. It is a zinc sacrificial propeller nut replacement anode for the B-style pattern and is intended for saltwater use. Current pattern references commonly associate the B replacement with 7/8 in. shaft applications.

Application / Compatibility

Suitable where a B-style replacement prop nut zinc is required. The safest match points are the existing prop nut style, shaft size, and replacement-anode pattern rather than appearance alone. Current zinc pattern references place the B replacement in the 7/8 in. shaft-size group.

Fitment Notice

Fitment should be confirmed by the installed prop nut assembly and replacement-anode pattern before ordering. Matching by CMT-PNZB / CMPNZB / PN-B-ZN remains the safest method.

When This Part Needs Replacement

Replace the anode when it is heavily wasted, pitted, cracked, loose, or significantly reduced in size. As a zinc anode, this version is intended for saltwater use and is not recommended for freshwater service.

Installation Notes

Current B-style replacement references indicate the mounting screw is sold separately on comparable pattern listings. Replacement prop nut guidance also notes the nylon patch is good for one initial application only, and thread retention should be confirmed during installation. Install on a clean contact surface and do not paint the anode.

Alternate / Superseded Part Numbers when applicable

CMT-PNZB
CMPNZB
PN-B-ZN
2539
BB
PROPNUT-B
PROPNUTB

Parts Desk Insight

The important detail on this part is that it is the replacement anode for the B-style prop nut system, not the full complete assembly. Matching the installed prop nut style first is the best way to avoid ordering the wrong replacement zinc.

Shipping

Shipping: Ships same or next day for fast Canada wide shipping.