PART SERIES SERIES 12Y1N_D (21MM) PINADRETXSAEBRLIESTHREAD MILLS - SHELL MILL aIpnpt.liTcahtrieoand1 aEpxptl.icTahtrioenad2 application 3 application 4 application 5 application 6 application 7 D2 L1 a D1 D2 L1 No. of Cutter Number a D1 Pilot Height Flutes 12Y1N-24019D1R01 0.827 2.480 0.750 1.970 5 Operating guidelines on page 700. 572