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The ultimate manhole covers site
A special German standard of the German Institute for Standardization ( ) for manhole covers (sewage, etc.) that defines the requirements for covers in the D400 ( ) load class. This standard defines the size, the materials and the weight in which the lid should withstand in order to the load.

Download document from Beuth Verlag (payment) https://www.beuth.de/de/norm/din-19584-2/154438761

An example of a cover that carries the standard on the "ultimate manhole covers" site. From this lid the picture that appears in the general section was taken.
There are 19 manhole covers in the site that has this standard
Click for all the covers with this standard

Click for the rest of the standards in the site

The ultimate manhole covers site

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