Common cast iron manhole cover specifications and models are as follows:
1, Φ400mm round manhole cover, bearing 5 tons, frame height 70mm, cover thickness 40mm.
2, Φ500mm round manhole cover, bearing 10 tons, frame height 70mm, cover thickness 40mm.
3, Φ600mm round manhole cover, bearing 15 tons, frame height 70mm, cover thickness 40mm.
4, Φ700mm round manhole cover, bearing 20 tons, frame height 70mm, cover thickness 40mm.
5, Φ800mm round manhole cover, bearing 25 tons, frame height 70mm, cover thickness 40mm.
6, Φ900mm round manhole cover, bearing 30 tons, frame height 70mm, cover thickness 40mm.
7, Φ1000mm round manhole cover, bearing 40 tons, frame height 70mm, cover thickness 40mm.
