MATERIAL 45 ACC.TO GB/T 699HEAT TREATMENTINDUCTION HARDENED AS SHOWN IN AREA CASE DEPTH 450HV AFTER MACHINING SHOWNCASE HARDNESS:MIN 55HRCSURFACE HARDNESS MIN 88HR15NTHROUGH HARDENING NOT PERMISSIBLEMEASURING POINT HARDNESSCHATTER MARKS IN THIS AREA NOT PERMISSIBLEPRE-MACHINING DINENESIONSNOT MEASURABLE ON FINISHED PAPT