Steel fs8740/4140; rockwell c26/c34; 5 in. Id; 7.875 in. Od; 1.188 in. H; 4 equally spaced lugs 0.500 in. H x 0.375 in. Thk on id; bottom counterbored to7.250/7.266 in. X 0.281 in. Deep; undercut to 0.688 in. Deep on 0.250 in. Radius; 7.125-12ns-2b thd 0.4375 in. Lg; 7.0709/7.0799 in. Pitch dia