This D400 manhole cover with a square frame and Ø 700 mm clear opening is fully certified to BS EN 124:2015 Class D400, sustaining wheel loads up to 400 kN (40 tonnes) for highways, urban roads, and car parks. Its hinged ductile‑iron cover features an integrated T‑316 stainless‑steel slam‑lock system that automatically secures upon closure, and locks open at 90° to prevent accidental drops during maintenance. An ergonomic integrated lifting handle simplifies single‑person operation and reduces injury risk, while a high‑traction chequered surface (PSRV 70+) ensures safe pedestrian and vehicular passage in all weather.

Overview

Engineered to meet BS EN 124:2015 Group 4 requirements, this D400 cover and frame combination is proof‑load tested under AASHTO M 306 to 40,000 lb, offering heavy‑duty reliability in trafficked areas. The Ø 700 mm clear opening accommodates standard inspection tools and equipment, while the square frame design integrates flush into a prepared recess for easy installation. Manufactured from EN GJS‑400‑15 spheroidal graphite cast iron, the assembly combines high tensile strength with exceptional impact resistance.

Key Features

• Class D400 Certification: Verified to BS EN 124:2015 for 400 kN static and dynamic loads, suitable for carriageways, parking areas, and pedestrian zones.

• Integrated Slam‑Lock System: T‑316 stainless‑steel hardware mounts flush to the cover underside, engaging automatically on closure to eliminate unsecured lids.

• 90° Open‑Position Safety Block: An internal latch holds the cover at 90°, preventing accidental closure and enhancing operator safety during inspections.

• Ergonomic Lifting Handle: Built‑in handle design minimizes back strain and finger injuries, allowing one‑person lift‑out without additional tools.

• Anti‑Slip Chequered Surface: UKAS‑accredited testing to PSRV 70+ ensures reliable traction under wet or oily conditions.

• Lightweight Ductile Iron Construction: Cast from GJS‑400‑15 for corrosion resistance and long‑term durability in harsh environments.

• ISO 9001 Quality Assurance: Produced in ISO 9001‑certified foundries for consistent manufacture and compliance with industry standards .

Technical Specifications

Benefits for End Users

By combining automatic slam‑lock security and a 90° safety block, this cover minimizes liability and work‑site risks, ensuring maintenance crews can perform inspections swiftly and safely. The integrated lifting handle and hinge‑pivot design reduce manual effort and tool requirements, cutting downtime and labor costs. Durable ductile‑iron construction and anti‑slip surface guarantee over 20 years’ service life in heavy‑traffic and harsh‑weather conditions.

Installation & Maintenance

The drop‑in square frame self‑aligns into a compacted bedding layer for a flush, non‑rock fit—no special anchoring required. Routine upkeep involves clearing debris, checking slam‑lock operation, and verifying the safety block latch—tasks completed in minutes to minimize disruptions.

Compliance & Quality Assurance

Each unit carries CE marking and is third‑party tested (UKAS‑accredited) for load, slip, and fatigue performance under BS EN 124:2015. Manufacturing follows ISO 9001 quality protocols to ensure traceability and regulatory conformity.