D400

D400 ductile iron manhole covers and frames are certified to a 400 kN test load (40 tonnes) under BS EN 124-2:2015 — the standard specification for carriageways, hard shoulders, pedestrianised streets carrying delivery vehicles, and parking areas for all types of road vehicle.

If the installation is on an adopted highway, D400 is almost always the minimum required.

Our D400 range carries BSI Kitemark KM 789143 and every cover is load tested to 10% above the BS EN 124 requirement — proven at 440kN, not just 400 kN. That margin matters on covers that take heavy commercial traffic thousands of times a day.

The range spans double triangular covers from 450 x 450 through to 1800 x 900, plus hinged four-part covers and frames for larger openings, in 100 mm and 150 mm depths. Skid-resistant treatment is available across the range, and standard sizes are held ex-stock in Telford for next-day nationwide delivery.

For Highways England schemes, see our D400 HA104 / CD534 compliant range. For docks, ports and airfields, step up to E600 or F900 — our guide to BS EN 124 loading classes sets out the full picture.