"STEEL STM05-501 300M TRICENT,3.670 IN. O/A LG,2.375 IN. ODO/A,BORE THRU 0.499 IN. MIN TO 0.506 IN. MAX ID,1 END1.750-16 UNEF-3A TH 0.510 IN. LG,AS NOTED MACHINED SURFACES3210 63.0 AND 125.0 MICROINCH FINISH,HEAT TREAT 280000 TO300000 PSI PER STP51-501,SHOT PEEN"