Round Manhole Covers
Round is the default choice for carriageways and deep chambers: a circular cover cannot fall through its own frame, and load is distributed evenly around the ring. Our round covers run from DN300 to DN900 clear opening, with a machined seating face that keeps the cover quiet under traffic.
- Clear opening DN300 – DN900
- Load classes A15 to F900
- Hinged, locking and sealed versions
- Anti-slip pattern: concentric ring or diamond
- Bitumen coating standard, epoxy on request
|
Size |
Clear opening |
Frame OD |
Depth |
Weight |
Typical class |
|
DN500 |
500 mm |
[650] mm |
[75] mm |
[45] kg |
C250 / D400 |
|
DN600 |
600 mm |
[750] mm |
[100] mm |
[68] kg |
C250 / D400 |
|
DN700 |
700 mm |
[860] mm |
[100] mm |
[95] kg |
D400 / E600 |
|
DN800 |
800 mm |
[970] mm |
[110] mm |
[125] kg |
D400 / E600 |
|
DN900 |
900 mm |
[1,080] mm |
[110] mm |
[150] kg |
E600 / F900 |
Why the underside matters
A cover's load rating is decided by the rib depth and the seating ring, not by how thick the face looks. Our D400 and E600 patterns use deeper radial ribs and a wider bearing ring so the cover passes the 400 kN and 600 kN test without permanent deflection.
Every pattern is proof-load tested before it goes into production, and the test report is supplied with the shipment.
Selection Guide
Which Shape Do You Need?
|
Installation |
Recommended shape |
Typical class |
Reason |
|
Carriageway, highway |
Round / Round-in-square |
D400 / E600 |
Circular cover cannot fall through; even load distribution |
|
Footway, plaza |
Square |
B125 / C250 |
Larger opening in the same footprint; aligns with paving |
|
Asphalt patch repair |
Round-in-square |
C250 / D400 |
Square frame matches the rectangular cut |
|
Cable / valve chamber |
Square, two-part |
B125 / C250 |
Large rectangular opening for equipment access |
|
Airport apron |
Round, F900 |
F900 |
Highest test load, aircraft wheel loads |
FAQ
Manhole Cover Questions
1.What does “clear opening” mean, and why does it matter?
Clear opening is the usable round or square hole you actually get when the cover is removed — not the outside size of the frame. A DN600 cover typically has a [750] mm frame; buyers who order by frame size often end up with an opening that is too small.
2.Can I buy covers only, without frames?
Yes, but send us the internal dimensions and seating depth of the existing frame. Covers are matched to a pattern, not to a nominal size.
3.Do you supply covers marked with our municipality's name?
Yes — lettering and logos are cast into the pattern, not painted on. Provide artwork or a photo of the existing marking.
4.How do I stop covers being stolen?
Specify a captive hinge plus stainless steel locking bolts — the cover lifts for inspection but cannot be walked away with. See our anti-theft specification when enquiring.
Tell us the opening size
We will confirm the class, weight and container load for you.
