Modular Drills Tool Selection Guide standard* standard range ⅷ first choice ࠗ alternate choice diameter range P M K N S H modular drills D1 mm D1 inch drilling depth with internal hole min–max min–max L/D1 coolant channel grade/series tolerance TOP DRILL M1™ with front clamping mechanism TOP DRILL M1inserts WU25PD** ⅷ ࠗ ⅷ IT9–IT11 7,94–25,99 .3125–1.1023 — TopSTEP SH— ⅷchamferingWP20PHⅷࠗ —insertsTopSTEP VG—ⅷࠗWP20PH—12,50–36,01.4921–1.4177— 7,94)Ø<9,50 .3125)Ø<.3740 9,50)Ø<11,00 .3740)Ø<.4331 11,00)Ø<12,50 .4331)Ø<.4921 12,50)Ø<14,00 .4921)Ø<.5512 TOP DRILL M1bodies — — 14,00)Ø<15,50 .5512)Ø<.6102 max 3–8 x D 15,50)Ø<16,50 .6102)Ø<.6496 16,50)Ø<20,50 .6496)Ø<.8071 20,50)Ø<21,00 .8071)Ø<.8268 21,00)Ø<25,99 .8268)Ø<1.023 * Apart from our standard drills, we can offer you a wide variety of special coating solutions and edge preparations to fulfill all your needs. If a specific drill is not suitable for your workpiece material, please contact your WIDIA™ distributor for available options. ** Grade WU25PD™ was previously named K20FTiAlN. U2 widia.com