I've been turning wrenches since I was about 8 years old. I've never used a 5/8" bolt for anything that I can recall. The fact that I may have a few dies in my Kennedy box is because they were my fathers and they're probably still unused since about the mid '70's...
1/4, 3/8, 1/2, 3/4" yes....tweeners like 5/8 and 7/8 not so much...