"STEEL MIL-S-6758 COMP 4130,1.940 IN. O/A LG,2.310 IN. MIN TO 3.312 IN. O/A DIA,2.118 IN. MIN TO 2.120 IN. MAX BORE DIA 1.840 IN. DP,MACHINED SURFACES 63.0 AND 125.0 MICROINCH FINISH,HEAT TREAT 125000 TO 145000 PSI,2 MTG HOLES 0.266 IN. DIA EQUALLY SPACED"