HSK - SHELL MILL ADAPTER Taper SizeHSK-A 50, 63 and 100 A ➚ A .00012 58-60 HRc Ra 4µin G2.5 15,000 RPM HSK D1 D G1 D2 L2 L L1 Designation HSK-A D1 L L1 L2 D HSK A50 SEM3/4 X2.375 50 .750 2.375 .669 1.351 1.770 HSK A50 SEM1 X2.500 50 1.000 2.500 .669 1.476 2.172 HSK A50 SEM1-1/4 X3.000 50 1.250 3.000 .669 1.976 2.516 HSK A63 SEM3/4 X2.375 63 .750 2.375 .669 1.351 1.770 HSK A63 SEM1 X1.750 63 1.000 1.750 .669 .726 2.086 HSK A63 SEM1-1/4 X2.375 63 1.250 2.375 .669 1.351 2.510 HSK A63 SEM1-1/2 X2.375 63 1.500 2.375 .938 1.351 3.070 HSK A63 SEM2 X2.375 63 2.000 2.375 .938 1.351 3.850 HSK A100 SEM3/4 X3.000* 100 .750 3.000 .669 1.858 1.770 HSK A100 SEM1 X2.375* 100 1.000 2.375 .669 1.233 2.165 HSK A100 SEM1-1/4 X1.875* 100 1.250 1.875 .669 .733 2.500 HSK A100 SEM1-1/2 X1.875* 100 1.500 1.875 .938 .733 3.881 HSK A100 SEM2 X2.375* 100 2.000 2.375 .938 1.233 3.881 * Balanced to G6.3 12,000 RPM 764