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Dimensional Tolerance
Specific density of SS
Heat Treatment Process
Hardness Conversion Chart
International Material
 Grade code

 
 
Rockwell
Brinell
 Vickers or Firth
150 kgm C Scale 60 kgm A Scale 100 kgm D Scale 100 kgm B Scale Hardness Number Diamond Hardness Number
80 92 87     1865
79 92 86     1787
78 91 85     1710
77 91 84     1633
76 90 83     1556
75 90 83     1478
74 89 82     1400
73 89 81     1323
72 88 80     1245
71 87 80     1160
70 87 79     1076
69 86 78     1004
68 86 77     942
67 85 76     894
66 85 76     854
65 84 75   745 820
64 84 74   710 789
63 83 73   710 763
62 83 73   682 746
61 82 72   682 720
60 81 71   653 697
59 81 70   627 674
58 80 69   578 653
57 80 69   578 633
56 79 68   555 613
55 79 67   555 595
54 78 66   534 577
53 77 65   514 560
52 77 65   495 544
51 76 64   495 528
50 76 63   477 513
49 75 62   461 498
48 75 61   444 484
47 74 61   444 471
46 73 60   432 458
45 73 59   415 446
44 73 59   415 434
43 72 58   401 423
42 72 57   388 412
41 71 56   388 402
40 70 55   375 392
39 70 55   363 382
38 69 54   353 372
37 69 53 109 341 363
36 68 52 109 331 354
35 68 52 108 331 345
34 67 51 108 321 336
33 67 50 107 311 327
32 66 49 106 302 318
31 66 48 106 293 310
30 65 48 105 285 302
29 65 47 104 277 294
28 64 46 103 269 286
27 64 45 103 262 279
26 63 45 102 255 272
25 63 44 101 255 266
24 62 43 100 248 260
23 62 42 99 241 254
22 62 42 99 235 248
21 61 41 98 229 243
20 61 40 97 223 238
18     95 217 230
16*     94 212 222
14*     92 203 213
12*     90 192 204
10*     89 187 195
8*     87 179 187
6*     85 170 180
4*     84 166 173
2*     82 156 166
0*     81 156 160
      79 149 156
      77 143 150
      74 137 143
      72 131 137
      70 126 132
      68 121 127
      65 116 122
        112 117
[Note]
These specific gravities are for reference only as they can vary with chemical components etc.
gravity unit: kg/cm²/m Remarks:
  1. Diameter and other deviations may not exceed 30% tolerance. However, with flat steel bars deviation will depend on that agreed upon between the buyer and seller.
  2. The descriptions in parentheses denote the class according to JlS B 0401.
  3. The negative values listed above may be divided into both positive and negative values so as to create the total tolerance range, if specified in the purchase order.
  4. For steel bars that are heat treated and pickled after cold working, double the tolerance of the next lesser (inferior) class in the above list and use that as the tolerance.
  5. Tolerance classes 14 to 18 are not applicable to stainless steel with a basic size of 1 mm or less.
 
     
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