4steel; 145000/155000 psi yield strength; 9.43 in.-9.44 in. Dia; 8.250 in. Bolt circle; 0.53 in.-0.56 in. Diameter 8 holes equally spaced; lug 0.62 in. Lg by 0.56 in. H by 0.24 in. Thk; 0.250-28unf-3b hole in lug; 4.750-12acme-3c centerhole thd; 5.12 in. Thk