Lockable Ductile Iron Manhole Cover

Many manhole covers are installed in open areas such as main roads, factory yards, and public infrastructure zones. Unauthorized removal can cause property loss and create safety hazards.

Our Lockable Ductile Iron Manhole Cover features an integrated locking system that secures the cover firmly to the frame. A special tool is required for opening, which helps prevent unauthorized access and removal. This design provides improved protection for drainage systems in remote or unmonitored locations.

We designed the locking system for demanding outdoor environments. The lock core provides excellent resistance against rust and corrosion. The internal components are protected from water and dust to maintain reliable operation.

The system continues to work effectively after long-term exposure to rain, mud, and changing weather conditions. We test lock performance under salt spray and high-temperature conditions to ensure stable operation in different climates.

The opening tool is compact and easy to carry. Maintenance teams can use the same tool to operate multiple covers across a project, improving inspection efficiency.

This product is available in four load grades: light, standard, heavy, and extra heavy. All models use a Φ700 diameter design with overall dimensions of 380 × 680 millimeters.

All grades meet the D400 load rating and support a 400 kN load capacity. The main differences between grades are material thickness and structural reinforcement.

The light version is suitable for sidewalks and green belts, while the extra heavy version is designed for freight roads and port areas. The same locking system works with all grades, allowing customers to use one set of opening tools throughout the entire project.