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Gerrard,
Your bolts are not 9/16ths. Fasteners are measured by diameter and threads per inch not by the wrench size. In your case 3/8"-16. Meaning the diameter is 3/8ths of an inch and there are 18 threads per inch. In this case 18 threads is considered a course thread, the fine thread for this is 24 threads per inch.
Here is a link to a good chart for nuts and bolts sizes. Tap Chart UNC/UNF Threads - provides tap sizes, drill sizes, pitch, (threads per inch) basic major diameter, basic effective diameter, basic minor diameter of external threads, and basic minor diameter of internal threads for UNC/UNF threads
Your bolts are not 9/16ths. Fasteners are measured by diameter and threads per inch not by the wrench size. In your case 3/8"-16. Meaning the diameter is 3/8ths of an inch and there are 18 threads per inch. In this case 18 threads is considered a course thread, the fine thread for this is 24 threads per inch.
Here is a link to a good chart for nuts and bolts sizes. Tap Chart UNC/UNF Threads - provides tap sizes, drill sizes, pitch, (threads per inch) basic major diameter, basic effective diameter, basic minor diameter of external threads, and basic minor diameter of internal threads for UNC/UNF threads