The D400 manhole cover with a square frame, featuring a clear opening of Ø600 mm, is engineered for heavy‑duty applications where traffic loads up to 400 kN (40 tonnes) are expected. Built to meet the rigorous standards set by BS EN 124:2015, this cover is ideal for use in high‑traffic areas such as highways, industrial zones, and urban infrastructure. Whether used for street maintenance, utility access, or emergency repairs, the square frame ensures precise alignment, easy installation, and a secure, non‑rock fit.
Made from GGG500/7 ductile iron, this cover boasts superior strength and fatigue resistance. Its robust construction and three‑point suspension system provide a flush fit, reducing vibration and ensuring long-term reliability. Furthermore, the square design allows for easier installation and secure positioning within the surrounding pavement. Coated with a durable 30 µm bitumen or optional epoxy finish, the cover is resistant to corrosion and capable of withstanding the harsh conditions of urban environments and high-traffic zones.
Product Overview
-
Heavy‑Duty Construction: Manufactured from GGG500/7-grade ductile iron, providing superior tensile strength and impact resistance.
-
Square Frame Design: The square frame provides easy alignment during installation, ensuring that the cover sits securely in place, while maintaining structural integrity.
-
D400 Load Rating: Rated to withstand up to 400 kN (40 tonnes), this cover is perfect for roads, highways, and any area exposed to heavy vehicular traffic.
Key Specifications
| Specification | Details |
|---|---|
| Clear Opening | Ø600 mm |
| Frame Type | Square Frame Design |
| Load Rating | D400 (400 kN / 40 t) |
| Material | GGG500/7 Ductile Iron (ISO 1083) |
| Frame Size | 750 × 750 × 100 mm (approx.) |
| Coating | 30 µm bitumen (standard); epoxy finish optional |
| Lifting Mechanism | Three‑point suspension system for easy handling |
| Surface Pattern | Anti-slip surface for pedestrian safety |
Technical Features
-
Ductile Iron Composition: Cast from high-quality GGG500/7 ductile iron, this cover ensures exceptional strength, fatigue resistance, and longevity even under repeated heavy loads.
-
Flush Fit and Stability: A precision-machined three‑point suspension system ensures that the cover remains securely in place, reducing the risk of shifting, rattling, or lifting over time.
-
Corrosion Resistance: The bitumen or optional epoxy coating protects the cover from environmental wear, ensuring it remains functional and safe even in coastal or chemically aggressive environments.
Quality & Compliance
-
BS EN 124:2015 Compliance: Designed to meet D400 load class standards for manhole covers and gratings, suitable for roads and heavy-traffic areas.
-
ISO 9001 Certified: Manufactured in compliance with ISO 9001 quality management standards to ensure consistent product quality.
-
Certified Performance: Third-party testing guarantees the cover’s capacity to withstand 400 kN (40 tonnes) of load and meet safety standards for high‑traffic public spaces.
Applications & Benefits
-
Ideal for High-Traffic Zones: Perfect for highways, industrial areas, city streets, and parking lots where heavy vehicles routinely pass.
-
Increased Safety: The anti-slip surface reduces the risk of accidents or injuries in pedestrian areas, ensuring compliance with safety regulations.
-
Reduced Maintenance Costs: The durability of the GGG500/7 ductile iron combined with protective coatings ensures a long lifespan and reduces the frequency of replacements.
-
Efficient Installation: The square frame design facilitates quick and easy installation, reducing labor costs and traffic disruptions during maintenance.
| Family: | Municipal |
| Packaging Qty: | 10 |
| Product Type: | Access Covers |
| Product Ranges: | TWINO Range |
| Certified Class: | D400 |
| Surface Finish: | Anti-slip surface |
| Clear Opening: | 600 mm |
| Flange Outer Length: | 850 mm |
| Flange Outer Width: | 850 mm |
| Frame Height: | 100 mm |
| Weight: | 59 kg |
| Watertight: | No |
| Cover Diameter: | 650 mm |
| Hinged: | Yes |
| Handling Key: | Hook Handle / 517082 |
| Locking Key: | N/A |
Ductile iron manhole cover specifications and parameters
| Parameter | Specification/Value |
|---|---|
| Material | Ductile Cast Iron (Grade 500-7) |
| Standard Compliance | EN 124, BS 497, ASTM A536, ISO 1083 |
| Shape | Round, Square, Oval |
| Load Rating | A15, B125, C250, D400, E600, F900 (EN 124 load classes) |
| Load Bearing Capacity | 1.5 – 90 tons (depending on the rating) |
| Size (Diameter/Length) | 300mm – 1500mm (depending on type and design) |
| Thickness of Lid | 20mm – 60mm (depending on the load class) |
| Weight | 10 kg to 150 kg (depending on size and class) |
| Cover Surface | Smooth, Anti-slip, Textured for grip |
| Corrosion Resistance | Excellent, with epoxy coatings or bituminous treatment |
| Gasket Type | Rubber, Neoprene, EPDM |
| Sealing Mechanism | Bolt-down, Locking system, Hinged |
| Drainage Holes | Yes, optional (for water drainage) |
| Coating Type | Bitumen coated, Epoxy coating, Hot-dip galvanizing |
| Temperature Resistance | -30°C to +150°C (depending on coating type) |
| Fire Resistance | Flame-retardant (meets local standards for fire resistance) |
| Noise Level | Low noise design for urban areas |
| Ventilation | Optional vented covers for gas or sewage systems |
| Color | Black, Gray, Custom colors available |
| Manufacturing Process | Sand casting, Lost wax casting, Centrifugal casting |
| Edge Type | Flat, Raised, Beveled, or Reinforced edges |
| Bearing Surface | Cast iron, Epoxy, Stainless Steel (optional) |
| Longevity | 50+ years with proper maintenance |
| Environmental Compliance | RoHS, REACH, and other regional environmental standards |
EN 
AR