HSK - BLANK - METRIC Taper SizeHSK-A 50, 63 and 100 58-60 HRc N5 HSK D L2 L1 L Designation HSK-A D D1 L L1 L2 HSK A 50 B16MN 100 50 53 41.8 100 74 58.0 HSK A 50 B16MN 200 50 53 41.8 200 174 158.0 HSK A 63 B16MN 100 63 63 52.8 100 74 55.5 HSK A 63 B16MN 200 63 63 52.8 200 174 155.5 HSK A 100 B16MN 100 100 102 85.0 100 71 54.8 HSK A 100 B16MN 200 100 102 85.0 200 171 154.8 Material: Case hardened alloy steel. Shank hardness 58 HRc minimum. Nose hardness 35-37 HRc. 773