AASHTO M 306-10

This specification is applicable to frames, grates, rings, and covers for inlets, manholes, and other structures for civil engineering use where items may be placed in traffic service and load bearing is a consideration.

The values stated in SI units are to be regarded as the standard.

This product replaces:AASHTO M 306-09 - Standard Specification for Drainage, Sewer, Utility, and Related Castings