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.
C-5