Why Reliance Zinc Anode Caps Outperform the Rest
Not all anode caps are created equal. At Reliance, we don't cut corners—we cast with purpose. Here's what sets our zinc caps apart:
Premium Material:
Made from Special High Grade (SHG) Zinc, our anodes offer higher purity and more consistent performance than recycled or impure alternatives.Strict Compliance:
Every cap meets or exceeds MIL-A-18001J and ASTM B418-80 standards—ensuring military-grade protection in even the harshest environments.Precision Fit:
Engineered by skilled technicians, our caps are designed for a secure, OEM-style fit that protects threads, bolts, and nuts with zero guesswork.Proven Reliability:
Trusted in critical infrastructure—from buried pipelines to water treatment systems—our caps deliver protection that holds up over time.
When it comes to corrosion control, shortcuts cost more. Choose quality. Choose Reliance.
SHG ZINC COMPOSITION | ||
|---|---|---|
| MATERIAL | MIL-A-18001J SPECIFICATIONS | ASTM B418-80 SPECIFICATIONS |
| Aluminum | 0.10 - 0.50% | 0.10 - 0.4% |
| Cadmium | 0.025 - 0.15% | 0.03 - 0.10% |
| Iron | 0.005% MAX | 0.005% MAX |
| Lead | 0.006% MAX | - |
| Copper | 0.005% MAX | - |
| Silicon | 0.125% MAX | - |
| Zinc | Remainder | Remainder |
How Zinc Anode Caps Work
Corrosion is an electrochemical process that occurs when dissimilar metals come into contact with moisture, forming a galvanic cell. Similar to how a battery works, moisture acts as the electrolyte, while the various metals—such as bolts, nuts, and fittings—serve as the positive and negative terminals.
In this system, the more negatively charged metal (the anode) corrodes first, sacrificing itself to protect the more noble, or positive, metal. Zinc is significantly more negative than most common metals, making it ideal as a sacrificial anode. As long as zinc remains, the protected component is effectively shielded from corrosion.
Zinc Anode Caps are designed to protect system components made from steel, cast iron, ductile iron, brass, and copper. The number of caps used directly impacts the length of protection—more zinc means longer service life.
For optimal performance, Zinc Anode Caps should be installed on all exposed bolts and fittings, particularly in corrosive or moisture-prone soil conditions.
Suitable Applications for Zinc Anode Caps
- Pipeline installers and manufacturers
- Pipeline flange manufacturers and suppliers
- Dredging and marine contractors
- Submersible pump manufacturers and suppliers
- Water boards and Utility providers
- Municipal councils and public works departments
- Corrosion engineers and consultants
- Wharf and jetty construction companies
Reliance Zinc Anode Caps are trusted by a wide range of industries and professionals, including:
Reliance Zinc Cap Specifications | ||||
|---|---|---|---|---|
| Thread Size | Dimensions | Nominal Weight | ||
| A | B | C | D | |
| Reliance Zinc Cap - 6 oz | in (mm) | in (mm) | in (mm) | lb (kg) |
| 1/2" x 13 UNC | 1.5" (38.1 mm) | 0.98" (24.9 mm) | 1.69" (42.95 mm) | 0.4 lb (0.15 kg) |
| 5/8" x 11 UNC | ||||
| 3/4" x 10 UNC | ||||
| 7/8" x 9 UNC | ||||
| 1" x 8 UNC | ||||
| Reliance Zinc Cap - 14 oz | in (mm) | in (mm) | in (mm) | lb (kg) |
| 1 1/8" x 7 UNC | 1.5" (38.1 mm) | 0.98" (24.9 mm) | 1.69" (42.95 mm) | 0.4 lb (0.15 kg) |
| 1 1/4" x 7 UNC | ||||
| 1 1/2" x 7 UNC | ||||
We offer Reliance branded zinc caps as well as private label caps. Contact us today to talk about your corrosion needs
