The information below explains the US guidelines and specifications for dry beans.
Dry Beans/Pinto Beans
Dry, edible beans, peas and lentils (product/commodity) produced under this Commodity Specification must meet the requirements specified in the applicable United States Standards for Beans, Whole Dry Peas, Split Peas and Lentils.
US pinto beans are graded US #1, US #2 or US #3. Specific guidelines and specifications for pinto beans and all other beans can be viewed at the USDA website.