Municipal Castings Association

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AASHTO STANDARDS

AASHTO M 306-07

In 2007, the American Association of State Highway and Transportation Officials (AASHTO) developed specifications for frames, grates, rings, and covers.

  • You may wish to protect yourself and your jurisdictions from specification liability issues by implementing AASHTO M-306-07.
  • This specification is applicable to frames, grates, rings, and covers for inlets, manholes, and other structures for civil engineering use where tensile strength is a major consideration.
  • AASHTO M-306-07 was implemented in 2005 and requires that municipal castings conform to the requirements of “Gray Iron Castings” AASHTO M105-06/ASTM A48 Class 35B. It further calls for a 40,000 pound proof load for H-20 traffic and 50,000 pound proof load for H-25 traffic. These proof load values represent a 2.5 safety factor over H 20 (16,000 lb) and H 25 (20,000 lb) wheel loads. It is the most recent and most stringent specification dealing with these products.

Download a copy of the AASHTO M-306-07 here.

BUY AMERICA REQUIREMENTS

By law, American-made iron foundry products must be used in all Federal transportation projects and state and local government projects that use Federal transportation dollars. This "Buy America" provision was established by law in the Intermodal Surface Transportation Efficiency Act of 1991 ("ISTEA"), which explicitly requires that any iron castings used in a Federal-aid highway project be entirely manufactured in the United States...
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