matl steel;11/250 in. od;5.500 in. id;05.00 in. thk;8 0.688 in. dia bolt holes equally spaced on a 9.500 in. dia bolt circle;1 threaded internal 0.125-27 npt hole located 22-1/2 deg from bolt hole;counterbored 45 deg 0.375 in. deep general characteristics item description