HSK - MORSE TAPER ADAPTER - METRIC Taper SizeHSK-A 50, 63 and 100 A ➚ A .005 58-60 HRc N5 L L1 HSK D K Designation HSK-A K D L L1 HSK A 50 MT1X100 50 MT1 25 100 74 HSK A 50 MT2X120 50 MT2 32 120 94 HSK A 50 MT3X140 50 MT3 40 140 114 HSK A 63 MT1X110 63 MT1 25 110 84 HSK A 63 MT2X120 63 MT2 32 120 94 HSK A 63 MT3X140 63 MT3 40 140 114 HSK A 63 MT4X160 63 MT4 48 160 134 HSK A 100 MT1X110 100 MT1 25 110 81 HSK A 100 MT2X120 100 MT2 32 120 91 HSK A 100 MT3X150 100 MT3 40 150 121 HSK A 100 MT4X170 100 MT4 48 170 141 HSK A 100 MT5X200 100 MT5 63 200 171 * Balanced to G2.5 35,000RPM 771