1.6880" bore diameter eight additional holes 0.250-28 unf-2BX0.625 in. min dp on 2.500 in. bolt circle; id cbore 2.00 in. min to 2.003 in. max; one end of flange internally threaded 0.250-28 unf-2bx 0.25 in. min dp 0.187 in. thru
0.0935" first hole diameter 0.6500" overall length surface finish of holes 32.0 microinz case hardened 0.004 in. min to 0.007 in. max dp rc 56.0 min to rc 63.0 max oxide surface treated 17c solid, plain, no outside flanges
0.1250" first hole diameter 2.0000" overall length vore is counterbore to 1.2500 in. dia, by 0.2500 in. depth; 2 notches on face of flange phosphate zinc or paint surface treated 22c solid, external flange one end
