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177PRE-THREAD DRILLING WITH CHAMFERING Explanation of Solid Carbide Combined Drills Description Example:SCDT 025 - 009 - 060 - M31 2 3 4 51 DesignationSCDT %u2014 Solid Carbide Drill Thread2 Drill Diameter (DC)DC3 Step Diameter Lendth (SDL)SDL4 Shank Size (DCONMS)DCONMSh65 For Thread Diameter SizeBasic Dimensions of Solid CarbideDrills with Chamfer GeometryDC140%u00b0PL SDLDC_2 m7LCF OAL45%u00b0LULSDCONMSh6DC %u2014 drilling diameterSDL %u2014 step diameter maximumDCONMS %u2014 connection diameter machine sideDC_2 %u2014 drilling diameterPL %u2014 point lengthLU %u2014 usable lengthLCF %u2014 length chip fluteOAL %u2014 overall lengthLS %u2014 shank length
