Page 333 - needle bearings
P. 333

Appendix
                                                                                                         NTN







       continued
                   Brinnel hardness                                   Rockwell special hardness
                                             Rockwell hardness 2ʣ
                 10 mm ball, load 3000 kgf                              special brake indenter  Tensile
        Vickers                                                                                 strength  Vickers
                                     A scale  B scale  C-scale  D-scale
       hardness                                                     15-N scale 30-N scale 45-N scale  Shore  kgf/mm 2  hardness
              Standard  Hultgren  Tungsten  Load  Load  Load  Load                        hardness       Load
       ʢDPHʣ                          60 kgf  100 kgf dia.  150 kgf  100 kgf  Load  Load  load  Approx.
                ball    ball  carbite ball                                                               50kgf
                                      brale  1/16in.  brale   brale  15 kgf  30 kgf   45 kgf     value
                                     identer  ball   indenter  indenter
         370    350     350    350    69.2     ʵ      37.7    53.6    79.2   57.4   40.4   ʵ     120     370
         360    341     341    341    68.7  ʢ109.0ʣ   36.6    52.8    78.6   56.4   39.1   50    115     360
         350    331     331    331    68.1     ʵ      35.5    51.9    78.0   55.4   37.8   ʵ     112     350
         340    322     322    322    67.6  ʢ108.0ʣ   34.4    51.1    77.4   54.4   36.5   47    109     340
         330    313     313    313    67.0     ʵ      33.3    50.2    76.8   53.6   35.2   ʵ     105     330
         320    303     303    303    66.4  ʢ107.0ʣ   32.2    49.4    76.2   52.3   33.9   45    103     320
         310    294     294    294    65.8     ʵ      31.0    48.4    75.6   51.3   32.5   ʵ     100     310
         300    284     284    284    65.2  ʢ105.5ʣ   29.8    47.5    74.9   50.2   31.1   42     97     300
         295    280     280    280    64.8     ʵ      29.2    47.1    74.6   49.7   30.4   ʵ      96     295
         290    275     275    275    64.5  ʢ104.5ʣ   28.5    46.5    74.2   49.0   29.5   41     94     290
         285    270     270    270    64.2     ʵ      27.8    46.0    73.8   48.4   28.7   ʵ      92     285
         280    265     265    265    63.8  ʢ103.5ʣ   27.1    45.3    73.4   47.8   27.9   40     91     280
         275    261     261    261    63.5     ʵ      26.4    44.9    73.0   47.2   27.1   ʵ      89     275
         270    256     256    256    63.1  ʢ102.0ʣ   25.6    44.3    72.6   46.4   26.2   38     87     270
         265    252     252    252    62.7     ʵ      24.8    43.7    72.1   45.7   25.2   ʵ      86     265
         260    247     247    247    62.4  ʢ101.0ʣ   24.0    43.1    71.6   45.0   24.3   37     84     260
         255    243     243    243    62.0     ʵ      23.1    42.2    71.1   44.2   23.2   ʵ      82     255
         250    238     238    238    61.6    99.5    22.2    41.7    70.6   43.4   22.2   36     81     250
         245    233     233    233    61.2     ʵ      21.3    41.1    70.1   42.5   21.1   ʵ      79     245
         240    228     228    228    60.7    98.1    20.3    40.3    69.6   41.7   19.9   34     78     240
         230    219     219    219     ʵ      96.7  ʢ18.0ʣ     ʵ      ʵ       ʵ      ʵ     33     75     230
         220    209     209    209     ʵ      95.0  ʢ15.7ʣ     ʵ      ʵ       ʵ      ʵ     32     71     220
         210    200     200    200     ʵ      93.4  ʢ13.4ʣ     ʵ      ʵ       ʵ      ʵ     30     68     210
         200    190     190    190     ʵ      91.5  ʢ11.0ʣ     ʵ      ʵ       ʵ      ʵ     29     65     200
         190    181     181    181     ʵ      89.5   ʢ8.5ʣ     ʵ      ʵ       ʵ      ʵ     28     62     190
         180    171     171    171     ʵ      87.1   ʢ6.0ʣ     ʵ      ʵ       ʵ      ʵ     26     59     180
         170    162     162    162     ʵ      85.0   ʢ3.0ʣ     ʵ      ʵ       ʵ      ʵ     25     56     170
         160    152     152    152     ʵ      81.7   ʢ0.0ʣ     ʵ      ʵ       ʵ      ʵ     24     53     160
         150    143     143    143     ʵ      78.7     ʵ       ʵ      ʵ       ʵ      ʵ     22     50     150
         140    133     133    133     ʵ      75.0     ʵ       ʵ      ʵ       ʵ      ʵ     21     46     140
         130    124     124    124     ʵ      71.2     ʵ       ʵ      ʵ       ʵ      ʵ     20     44     130
         120    114     114    114     ʵ      66.7     ʵ       ʵ      ʵ       ʵ      ʵ     ʵ      40     120
         110    105     105    105     ʵ      62.3     ʵ       ʵ      ʵ       ʵ      ʵ     ʵ      ʵ      110
         100     95     95      95     ʵ      56.2     ʵ       ʵ      ʵ       ʵ      ʵ     ʵ      ʵ      100
          95     90     90      90     ʵ      52.0     ʵ       ʵ      ʵ       ʵ      ʵ     ʵ      ʵ       95
          90     86     86      86     ʵ      48.0     ʵ       ʵ      ʵ       ʵ      ʵ     ʵ      ʵ       90
          85     81     81      81     ʵ      41.0     ʵ       ʵ      ʵ       ʵ      ʵ     ʵ      ʵ       85
       1) Some of the parenthesized values in the above table are not used so frequently.
       2) Approximate values were determined from “Conversion Tables” of JIS Z 8413 and Z 8438.























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