HSK - END MILL HOLDER Taper SizeHSK-A 50, 63 and 100 A ➚ A .00020 58-60 HRc Ra 4µin L L1 Ford > 7/8” HSK D D d d Designation HSK-A d L D L1 HSK A 50 EM3/16 X2.562 50 .188 2.562 .866 1.538 HSK A 50 EM1/4 X2.562 50 .250 2.562 1.000 1.538 HSK A 50 EM3/8 X2.562 50 .375 2.562 1.378 1.538 HSK A 50 EM1/2 X3.125 50 .500 3.125 1.614 2.101 HSK A 50 EM5/8 X3.125 50 .625 3.125 1.752 2.101 HSK A 50 EM3/4 X3.125 50 .750 3.125 1.937 2.101 HSK A 50 EM7/8 X4.000 50 .875 4.000 2.205 2.976 HSK A 50 EM1 X4.250 50 1.000 4.250 2.563 3.226 HSK A 63 EM3/16 X2.562 63 .188 2.562 .866 1.538 HSK A 63 EM1/4 X2.562 63 .250 2.562 1.000 1.538 HSK A 63 EM3/8 X2.562 63 .375 2.562 1.378 1.538 HSK A 63 EM1/2 X3.125 63 .500 3.125 1.614 2.101 HSK A 63 EM5/8 X3.125 63 .625 3.125 1.752 2.101 HSK A 63 EM3/4 X3.150 63 .750 3.150 1.937 2.101 HSK A 63 EM7/8 X4.000 63 .875 4.000 2.047 2.976 HSK A 63 EM1 X4.250 63 1.000 4.250 2.563 3.226 HSK A 63 EM1-1/4X4.250 63 1.250 4.250 2.813 3.226 HSK A100 EM3/16 X3.125 100 .188 3.125 .866 1.983 HSK A100 EM1/4 X3.125 100 .250 3.125 1.000 1.983 HSK A100 EM3/8 X3.125 100 .375 3.125 1.378 1.983 HSK A100 EM1/2 X3.125 100 .500 3.125 1.614 1.983 HSK A100 EM5/8 X4.000 100 .625 4.000 1.752 2.858 HSK A100 EM3/4 X4.000 100 .750 4.000 1.937 2.858 HSK A100 EM7/8 X4.000 100 .875 4.000 2.047 2.858 HSK A100 EM1 X4.000 100 1.000 4.000 2.563 2.858 HSK A100 EM1-1/4X4.000 100 1.250 4.000 2.813 2.858 HSK A100 EM1-1/2X4.000 100 1.500 4.000 3.000 2.858 753