HRB >> Rockwell B-Scale 41~100 HRC 43 Rockwell C-Scale 19~69 HRD 58 Rockwell D-Scale 39~77 HRF >> Rockwell F-Scale 88~100 HR-15N 82 Rockwell Superficial 15N 69~94 HR-15T >> Rockwell Superficial 15T 77~93 HR-30N 63 Rockwell Superficial 30N 41~85 HR-30T >> Rockwel...