Page 330 - needle bearings

Appendix
NTN

Approximate conversion values against Rockwell C hardness of steel materials 1ʣ
Brinnel hardness Rockwell special hardness
Rockwell hardness 2ʣ
100 mm ball, load 3000 kgf special brake indenter Tensile
Rockwell Pickers A scale B scale D-scale strength Rockwell
C scale hardness Load Load Load 15-N scale 30-N scale 45-N scale Shore kgf/mm 2 C scale
2) Standard Hultgren Tungsten hardness
hardness ʢDPHʣ 60kgf 100 kgf dia. 100 kgf Load Load load Approx. hardness 2)
ball ball carbite ball
brale 1/16in. brale 15 kgfkgf 30 kgf 45 kgf value
identer ball indenter
68 940 ʵ ʵ ʵ 85.6 ʵ 76.9 93.2 84.4 75.4 97 ʵ 68
67 900 ʵ ʵ ʵ 85.0 ʵ 76.1 92.9 83.6 74.2 95 ʵ 67
66 865 ʵ ʵ ʵ 84.5 ʵ 75.4 92.5 82.8 73.3 92 ʵ 66
65 832 ʵ ʵ 739 83.9 ʵ 74.5 92.2 81.9 72.0 91 ʵ 65
64 800 ʵ ʵ 722 83.4 ʵ 73.8 91.8 81.1 71.0 88 ʵ 64
63 772 ʵ ʵ 705 82.8 ʵ 73.0 91.4 80.1 69.9 87 ʵ 63
62 746 ʵ ʵ 688 82.3 ʵ 72.2 91.1 79.3 68.8 85 ʵ 62
61 720 ʵ ʵ 670 81.8 ʵ 71.5 90.7 78.4 67.7 83 ʵ 61
60 697 ʵ 613 654 81.2 ʵ 70.7 90.2 77.5 66.6 81 ʵ 60
59 674 ʵ 599 634 80.7 ʵ 69.9 89.8 76.6 65.5 80 ʵ 59
58 653 ʵ 587 615 80.1 ʵ 69.2 89.3 75.7 64.3 78 ʵ 58
57 633 ʵ 575 595 79.6 ʵ 68.5 88.9 74.8 63.2 76 ʵ 57
56 613 ʵ 561 577 79.0 ʵ 67.7 88.3 73.9 62.0 75 ʵ 56
55 595 ʵ 546 560 78.5 ʵ 66.9 87.9 73.0 60.9 74 212 55
54 577 ʵ 534 543 78.0 ʵ 66.1 87.4 72.0 59.8 72 205 54
53 560 ʵ 519 525 77.4 ʵ 65.4 86.9 71.2 58.6 71 199 53
52 544 500 508 512 76.8 ʵ 64.6 86.4 70.2 57.4 69 192 52
51 528 487 494 496 76.3 ʵ 63.8 85.9 69.4 56.1 68 186 51
50 513 475 481 481 75.9 ʵ 63.1 85.5 68.5 55.0 67 179 50
49 498 464 469 469 75.2 ʵ 62.1 85.0 67.6 53.8 66 172 49
48 484 451 455 455 74.7 ʵ 61.4 84.5 66.7 52.5 64 167 48
47 471 442 443 443 74.1 ʵ 60.8 83.9 65.8 51.4 63 161 47
46 458 432 432 432 73.6 ʵ 60.0 83.5 64.8 50.3 62 156 46
45 446 421 421 421 73.1 ʵ 59.2 83.0 64.0 49.0 60 151 45
44 434 409 409 409 72.5 ʵ 58.5 82.5 63.1 47.8 58 146 44
43 423 400 400 400 72.0 ʵ 57.7 82.0 62.2 46.7 57 141 43
42 412 390 390 390 71.5 ʵ 56.9 81.5 61.3 45.5 56 136 42
41 402 381 381 381 70.9 ʵ 56.2 80.9 60.4 44.3 55 132 41
40 392 371 371 371 70.4 ʵ 55.4 80.4 59.5 43.1 54 127 40
39 382 362 362 362 69.9 ʵ 54.6 79.9 58.6 41.9 52 124 39
38 372 353 353 353 69.4 ʵ 53.8 79.4 57.7 40.8 51 120 38
37 363 344 344 344 68.9 ʵ 53.1 78.8 56.8 39.6 50 118 37
36 354 336 336 336 68.4 ʢ109.0ʣ 52.3 78.3 55.9 38.4 49 114 36
35 345 327 327 327 67.9 ʢ108.5ʣ 51.5 77.7 55.0 37.2 48 110 35
34 336 319 319 319 67.4 ʢ108.0ʣ 50.8 77.2 54.2 36.1 47 108 34
33 327 311 311 311 66.8 ʢ107.5ʣ 50.0 76.6 53.3 34.9 46 105 33
32 318 301 301 301 66.3 ʢ107.0ʣ 49.2 76.1 52.1 33.7 44 102 32
31 310 294 294 294 65.8 ʢ106.0ʣ 48.4 75.6 51.3 32.5 43 100 31
30 302 286 286 286 65.3 ʢ105.5ʣ 47.7 75.0 50.4 31.3 42 97 30
29 294 279 279 279 64.7 ʢ104.5ʣ 47.0 74.5 49.5 30.1 41 95 29
28 286 271 271 271 64.3 ʢ104.0ʣ 46.1 73.9 48.6 28.9 41 93 28
27 279 264 264 264 63.8 ʢ103.0ʣ 45.2 73.3 47.7 27.8 40 90 27
26 272 258 258 258 63.3 ʢ102.5ʣ 44.6 72.8 46.8 26.7 38 88 26
25 266 253 253 253 62.8 ʢ101.5ʣ 43.8 72.2 45.9 25.5 38 86 25
24 260 247 247 247 62.4 ʢ101.0ʣ 43.1 71.6 45.0 24.3 37 84 24
23 254 243 243 243 62.0 100.0 42.1 71.0 44.0 23.1 36 82 23
22 248 237 237 237 61.5 99.0 41.6 70.5 43.2 22.0 35 80 22
21 243 231 231 231 61.0 98.5 40.9 69.9 42.3 20.7 35 79 21
20 238 226 226 226 60.5 97.8 40.1 69.4 41.5 19.6 34 77 20
ʢ18ʣ 230 219 219 219 ʵ 96.7 ʵ ʵ ʵ ʵ 33 75 ʢ18ʣ
ʢ16ʣ 222 212 212 212 ʵ 95.5 ʵ ʵ ʵ ʵ 32 72 ʢ16ʣ
ʢ14ʣ 213 203 203 203 ʵ 93.9 ʵ ʵ ʵ ʵ 31 69 ʢ14ʣ
ʢ12ʣ 204 194 194 194 ʵ 92.3 ʵ ʵ ʵ ʵ 29 66 ʢ12ʣ
ʢ10ʣ 196 187 187 187 ʵ 90.7 ʵ ʵ ʵ ʵ 28 63 ʢ10ʣ
ʢ 8ʣ 188 179 179 179 ʵ 89.5 ʵ ʵ ʵ ʵ 27 61 ʢ 8ʣ
ʢ 6ʣ 180 171 171 171 ʵ 87.1 ʵ ʵ ʵ ʵ 26 59 ʢ 6ʣ
ʢ 4ʣ 173 165 165 165 ʵ 85.5 ʵ ʵ ʵ ʵ 25 56 ʢ 4ʣ
ʢ 2ʣ 166 158 158 158 ʵ 83.5 ʵ ʵ ʵ ʵ 24 54 ʢ 2ʣ
ʢ 0ʣ 160 152 152 152 ʵ 81.7 ʵ ʵ ʵ ʵ 24 53 ʢ 0ʣ
Note 1) Approximate values were determined from “Conversion Tables” of JIS Z 8413 and Z 8438.
2) Some of the parenthesized values in the above table are not used so frequently.
C-2