Page 1578 - MISUMI SINGAPORE Economy Series
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[Technical Data]
            Hardness Conversion Table                         (SAEJ417) *Revised in 1983




          Approximate Conversion of Rockwell C Hardness Values for Steel (1)
                    Brinell Hardness (HB)              Rockwell Superficial Hardness
                                                                                  Tensile Strength Rockwell
           (HRC)     10mm Ball ,   Rockwell Hardness (3)  Diamond Cone Indenter  (Hs) (Approximated Value) C-Scale
          Rockwell  (HV)  Load 3000kgf
          C-Scale  Vickers  Tungsten  (HRA) A   (HRB) B Scale,  (HRD) D Scale,   15-N  30-N  45-N  Shore   MPa  Hardness
          Hardness  Hardness Standard  Carbide  Scale, Load   Load100kgf,   Load 100kgf,   Scale Load Scale Load Scale Load  Hardness  (kgf/mm 2 )  C
                     Sphere  Sphere  60kgf,Diamond Diameter1.6mm Diamond Cone   15kgf  30kgf  45kgf  (2)  (3)
                                                Indenter
                              Cone Indenter (1/16in)Sphere
           68   940   -    -     85.6    -      76.9    93.2    84.4    75.4   97    -      68
           67   900   -    -     85.0    -      76.1    92.9    83.6    74.2   95    -      67
           66   865   -    -     84.5    -      75.4    92.5    82.8    73.3   92    -      66
           65   832   -   (739)  83.9    -      74.5    92.2    81.9    72.0   91    -      65
           64   800   -   (722)  83.4    -      73.8    91.8    81.1    71.0   88    -      64
           63   772   -   (705)  82.8    -      73.0    91.4    80.1    69.9   87    -      63
           62   746   -   (688)  82.3    -      72.2    91.1    79.3    68.8   85    -      62
           61   720   -   (670)  81.8    -      71.5    90.7    78.4    67.7   83    -      61
           60   697   -   (654)  81.2    -      70.7    90.2    77.5    66.6   81    -      60
           59   674   -   (634)  80.7    -      69.9    89.8    76.6    65.5   80    -      59
           58   653   -   615    80.1    -      69.2    89.3    75.7    64.3   78    -      58
           57   633   -   595    79.6    -      68.5    88.9    74.8    63.2   76    -      57
           56   613   -   577    79.0    -      67.7    88.3    73.9    62.0   75    -      56
           55   595   -   560    78.5    -      66.9    87.9    73.0    60.9   74  2075 (212)  55
           54   577   -   543    78.0    -      66.1    87.4    72.0    59.8   72  2015 (205)  54
           53   560   -   525    77.4    -      65.4    86.9    71.2    58.5   71  1950 (199)  53
           52   544  (500)  512  76.8    -      64.6    86.4    70.2    57.4   69  1880 (192)  52
           51   528  (487)  496  76.3    -      63.8    85.9    69.4    56.1   68  1820 (186)  51
           50   513  (475)  481  75.9    -      63.1    85.5    68.5    55.0   67  1760 (179)  50
           49   498  (464)  469  75.2    -      62.1    85.0    67.6    53.8   66  1695 (173)  49
           48   484  451  455    74.7    -      61.4    84.5    66.7    52.5   64  1635 (167)  48
           47   471  442  443    74.1    -      60.8    83.9    65.8    51.4   63  1580 (161)  47
           46   458  432  432    73.6    -      60.0    83.5    64.8    50.3   62  1530 (156)  46
           45   446  421  421    73.1    -      59.2    83.0    64.0    49.0   60  1480 (151)  45
           44   434  409  409    72.5    -      58.5    82.5    63.1    47.8   58  1435 (146)  44
           43   423  400  400    72.0    -      57.7    82.0    62.2    46.7   57  1385 (141)  43
           42   412  390  390    71.5    -      56.9    81.5    61.3    45.5   56  1340 (136)  42
           41   402  381  381    70.9    -      56.2    80.9    60.4    44.3   55  1295 (132)  41
           40   392  371  371    70.4    -      55.4    80.4    59.5    43.1   54  1250 (127)  40
           39   382  362  362    69.9    -      54.6    79.9    58.6    41.9   52  1215 (124)  39
           38   372  353  353    69.4    -      53.8    79.4    57.7    40.8   51  1180 (120)  38
           37   363  344  344    68.9    -      53.1    78.8    56.8    39.6   50  1160 (118)  37
           36   354  336  336    68.4   (109.0)  52.3   78.3    55.9    38.4   49  1115 (114)  36
           35   345  327  327    67.9   (108.5)  51.5   77.7    55.0    37.2   48  1080 (110)  35
           34   336  319  319    67.4   (108.0)  50.8   77.2    54.2    36.1   47  1055 (108)  34
           33   327  311  311    66.8   (107.5)  50.0   76.6    53.3    34.9   46  1025 (105)  33
           32   318  301  301    66.3   (107.0)  49.2   76.1    52.1    33.7   44  1000 (102)  32
           31   310  294  294    65.8   (106.0)  48.4   75.6    51.3    32.7   43  980 (100)  31
           30   302  286  286    65.3   (105.5)  47.7   75.0    50.4    31.3   42  950 (  97)  30
           29   294  279  279    64.7   (104.5)  47.0   74.5    49.5    30.1   41  930 (  95)  29
           28   286  271  271    64.3   (104.0)  46.1   73.9    48.6    28.9   41  910 (  93)  28
           27   279  264  264    63.8   (103.0)  45.2   73.3    47.7    27.8   40  880 (  90)  27
           26   272  258  258    63.3   (102.5)  44.6   72.8    46.8    26.7   38  860 (  88)  26
           25   266  253  253    62.8   (101.5)  43.8   72.2    45.9    25.5   38  840 (  86)  25
           24   260  247  247    62.4   (101.0)  43.1   71.6    45.0    24.3   37  825 (  84)  24
           23   254  243  243    62.0   100.0   42.1    71.0    44.0    23.1   36  805 (  82)  23
           22   248  237  237    61.5     99.0  41.6    70.5    43.2    22.0   35  785 (  80)  22
           21   243  231  231    61.0     98.5  40.9    69.9    42.3    20.7   35  770 (  79)  21
           20   238  226  226    60.5     97.8  40.1    69.4    41.5    19.6   34  760 (  77)  20
           (18)  230  219  219   -        96.7   -       -       -       -     33  730 (  75)  (18)
           (16)  222  212  212   -        95.5   -       -       -       -     32  705 (  72)  (16)
           (14)  213  203  203   -        93.9   -       -       -       -     31  675 (  69)  (14)
           (12)  204  194  194   -        92.3   -       -       -       -     29  650 (  66)  (12)
           (10)  196  187  187   -        90.7   -       -       -       -     28  620 (  63)  (10)
           (  8)  188  179  179  -        89.5   -       -       -       -     27  600 (  61)  (  8)
           (  6)  180  171  171  -        87.1   -       -       -       -     26  580 (  59)  (  6)
           (  4)  173  165  165  -        85.5   -       -       -       -     25  550 (  56)  (  4)
           (  2)  166  158  158  -        83.5   -       -       -       -     24  530 (  54)  (  2)
           (  0)  160  152  152  -        81.7   -       -       -       -     24  515 (  53)  (  0)
          Note (1): Blue figures: Based on ASTM E 140, Table 1 (Jointly coordinated by SAE, ASM and ASTM).
             (2):  The units and figures shown in brackets are the results of conversion from psi figures by reference to JIS
                Z 8413 and Z 8438 conversion tables.
                Moreover, 1MPa=1N/mm 2
             (3): The figures in brackets are in ranges not frequently used. They are given as referential data.
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