Exact............? :giggle:
Hex head, 1/2”-20 tpi UNF, Grade-8, L= 1-½”, partially threaded, 5/8" shank (grip)
BTW: Flanges are 3/8" thick. So, if the stock bolts are hard to find (or too expensive), a std 2" long, Grade 8 bolt with a 3/4" unthreaded shank will also do, after cutting off...