Drill bits Hardness for different kind of High Speed Steel
M42 HSS Drill bits Hardness HRC67-69
M35 HSS Drill bits Hardness HRC65-68
M2 HSS Drill bits Hardness HRC63-65
HSS4341 HSS Drill bits Hardness HRC59-63
HSS4241 HSS Drill bits Hardness HRC58-62