Mitutoyo HM-200A Series - Page 149

9. Appendix
No. 99MBG127A
9-11
Hardness conversion chart of ASTM 73 Cu (ASTM E 140, seven-three brass C2600 (brass 70%, zinc
30%), continued
HV HRB HRF HR15T HR30T HR45T HBS
4.9035N
10mmBall
92 49.5 85.4 76.5 49.0 23.0 82
90 47.5 84.4 75.5 48.0 21.0 80
88 46.0 83.5 75.0 47.0 19.0 79
86 44.0 82.3 74.5 45.5 17.0 77
84 42.0 81.2 73.5 44.0 14.5 76
82 40.0 80.0 73.0 43.0 12.5 74
80 37.5 78.6 72.0 41.0 10.0 72
78 35.0 77.4 71.5 39.5 7.5 70
76 32.5 76.0 70.5 38.0 4.5 68
74 30.0 74.8 70.0 36.0 1.0 66
72 27.5 73.2 69.0 34.0 64
70 24.5 71.8 68.0 32.0 63
68 21.5 70.0 67.0 30.0 62
66 18.5 68.5 66.0 28.0 61
64 15.5 66.8 65.0 25.5 59
62 12.5 65.0 63.5 23.0 57
60 10.0 62.5 62.5 --- 55
58 61.0 61.0 18.0 53
56 58.8 60.0 15.0 52
54 56.5 58.5 12.0 50
52 53.5 57.0 48
50 50.5 55.5 47
49 49.0 54.5 46
48 47.0 53.5 45
47 45.0 44
46 43.0 43
45 40.0 42
44
43
42
41
40
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