This D400 multileaf manhole cover combines a 750 × 750 mm clear opening with a 120 mm frame height, certified to BS EN 124:2015 Class D400 for 400 kN (40 tonne) wheel loads—ideal for roads, car parks, and pedestrian zones. Its hinged, double‑triangular leaves pivot smoothly for one‑person access, while a three‑point suspension eliminates rocking under traffic. Engineered from high‑grade ductile iron with anti‑slip tread, optional locking, and pressure‑release features, it delivers decades of low‑maintenance reliability in demanding environments.
Overview
Our D400 multileaf cover is manufactured from EN GJS‑500‑7 spheroidal graphite cast iron, offering exceptional tensile strength and impact resistance for highway‑class installations. The 750 × 750 mm clear opening accommodates standard maintenance tools, while the 120 mm deep, drop‑in frame self‑aligns flush into a prepared recess to minimize installation time and ensure consistent seating.
Key Features
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Class D400 Certification: Verified to BS EN 124:2015 Group 4, sustaining 400 kN (40 tonnes) of static and dynamic wheel loads.
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Double‑Triangular Hinged Leaves: Two interlocking triangular sections pivot on a full‑length hinge for ergonomic, one‑person operation.
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Three‑Point Non‑Rock Suspension: Prevents cover displacement and rattling under repeated traffic passages.
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Anti‑Slip Tread Pattern: Raised chequered surface exceeds PSRV 70 standards to maintain traction in wet or oily conditions.
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Optional Security Locking: Screw‑locking, cam‑bolt, or turnbuckle systems available to deter tampering and unauthorized access.
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Pressure‑Release Holes: Allow air to escape during cover seating, preventing hydraulic locking and easing operation.
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Custom Coatings & Badging: Bitumen or epoxy finishes, plus bespoke logos or numbering, support corporate branding and asset tracking.
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Frame Depth Options: Standard 120 mm depth; adjustable from 100–150 mm to suit installation requirements.
Technical Specifications
| Specification | Details |
|---|---|
| Standard | BS EN 124:2015 Class D400 |
| Clear Opening | 750 × 750 mm |
| Frame Height | 120 mm (100–150 mm options) |
| Overall Frame | 965 × 965 mm |
| Material | Ductile iron (EN GJS‑500‑7) |
| Load Capacity | 400 kN (40 tonnes) |
| Surface Finish | Bitumen (30 µm) or epoxy coating |
| Suspension | Three‑point non‑rock |
| Access | Hinged, double‑triangular leaves |
Benefits for End Users
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Enhanced Safety: Anti‑rock suspension and locking options reduce cover movement and unauthorized opening, minimizing trip‑hazards and vandalism.
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Operational Efficiency: Hinged design and pressure‑release holes speed up inspections and maintenance, cutting labor costs and downtime.
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Long‑Term Durability: Ductile‑iron construction and robust coatings resist corrosion and deformation, promising over 30 years of service in harsh traffic environments.
Installation & Maintenance
Drop‑in installation requires minimal preparation: set the self‑aligning frame into a compacted bedding layer and secure, then close the cover to engage the latch automatically. Routine maintenance involves checking hinges, lubricating locking bolts, and clearing tread patterns—tasks completed in minutes to limit operational disruption.
Compliance & Quality Assurance
Produced in ISO 9001‑certified foundries and tested by UKAS‑accredited labs for load, slip, and fatigue performance. Fully compliant with Highways England CD 534 v0.1.0 (formerly HA 104/09) and carries BSI Kitemark certification where applicable.
| Family: | Telecom / Fibre / Cable |
| Packaging Qty: | 4 |
| Product Type: | Telecom Access Cover |
| Certified Class: | D400 |
| Surface Finish: | Anti-slip surface |
| Clear Opening Length (Hinge Side): | 750 mm |
| Clear Opening Width: | 750 mm |
| Flange Outer Length: | 910 mm |
| Flange Outer Width: | 950 mm |
| Frame Height: | 120 mm |
| Weight: | 157 kg |
| Mass Per Unit Area: | 171 kg |
| Watertight: | No |
| Cover/Grating Shape: | Double Triangular |
| Cover/Grating Length: | 752 mm |
| Hatch Cover/Grating Qty: | 2 |
| Cover Security Block Angle: | 90 |
| Hinged: | Yes |
| Hinge Type: | FT |
| Number of Locking: | 1 |
| Opening Direction: | Vertical |
| Frame Style: | Monoblock as Cast |
| Frame Shape on Vertical Section: | Flat |
| Frame Surface Protection By: | Water-Based Paint |
| Nb Anchoring Hole: | 4 |
| Installation Type: | With Concrete |
| Installation On: | K1 Chamber |
| Diameter Anchoring hole: | 20 mm |
| Handling Key: | Hook Handle / 517082 |
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 |
