Ductile Iron Manhole Cover Sizes Guide: Square Outer Round Inner Covers

Common sizes of square outer round inner ductile iron manhole covers include a square frame size of 600×600 mm with an inner circular panel diameter of 500 mm, and a square frame size of 700×700 mm with an inner circular panel diameter of 600 mm. The specific applications are as follows:

Pedestrian Areas / Residential Communities

Common sizes include:

• Square frame 600×600 mm, inner circular panel diameter 500 mm

• Square frame 700×700 mm, inner circular panel diameter 600 mm

The typical load class is generally C250.

Commercial Streets / Parks

Common sizes include:

• Square frame 700×700 mm, inner circular panel diameter 600 mm

• Square frame 800×800 mm, inner circular panel diameter 700 mm

The commonly used load class is D400.

Secondary Roads and Supporting Areas

Available sizes include:

• Square frame 800×800 mm, inner circular panel diameter 700 mm

• Square frame 900×900 mm, inner circular panel diameter 800 mm

The load classes are generally D400 or E600.

Old Urban Area Renovation Projects

Commonly selected sizes include:

• Square frame 700×700 mm, inner circular panel diameter 600 mm

• Square frame 900×900 mm, inner circular panel diameter 800 mm

The applicable load classes are usually C250 or D400.

In addition, other sizes such as 600×700 mm, 700×800 mm, and 700×900 mm are also available. Customized sizes can be manufactured according to specific project requirements.