Page 332 - needle bearings

Appendix
NTN

Approximate conversion values against Vickers hardness of steel materials
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
940 ʵ ʵ ʵ 85.6 ʵ 68.0 76.9 93.2 84.4 75.4 97 ʵ 940
920 ʵ ʵ ʵ 85.3 ʵ 67.5 76.5 93.0 84.0 74.8 96 ʵ 920
900 ʵ ʵ ʵ 85.0 ʵ 67.0 76.1 92.9 83.6 74.2 95 ʵ 900
880 ʵ ʵ 767 84.7 ʵ 66.4 75.7 92.7 83.1 73.6 93 ʵ 880
860 ʵ ʵ 757 84.4 ʵ 65.9 75.3 92.5 82.7 73.1 92 ʵ 860
840 ʵ ʵ 745 84.1 ʵ 65.3 74.8 92.3 82.2 72.2 91 ʵ 840
820 ʵ ʵ 733 83.8 ʵ 64.7 74.3 92.1 81.7 71.8 90 ʵ 820
800 ʵ ʵ 722 83.4 ʵ 64.0 73.8 91.8 81.1 71.0 88 ʵ 800
780 ʵ ʵ 710 83.0 ʵ 63.3 73.3 91.5 80.4 70.2 87 ʵ 780
760 ʵ ʵ 698 82.6 ʵ 62.5 72.6 91.2 79.7 69.4 86 ʵ 760
740 ʵ ʵ 684 82.2 ʵ 61.8 72.1 91.0 79.1 68.6 84 ʵ 740
720 ʵ ʵ 670 81.8 ʵ 61.0 71.5 90.7 78.4 67.7 83 ʵ 720
700 ʵ 615 656 81.3 ʵ 60.1 70.8 90.3 77.6 66.7 81 ʵ 700
690 ʵ 610 647 81.1 ʵ 59.7 70.5 90.1 77.2 66.2 ʵ ʵ 690
680 ʵ 603 638 80.8 ʵ 59.2 70.1 89.8 76.8 65.7 80 ʵ 680
670 ʵ 597 630 80.5 ʵ 58.8 69.8 89.7 76.4 65.3 ʵ ʵ 670
660 ʵ 590 620 80.3 ʵ 58.3 69.4 89.5 75.9 64.7 79 ʵ 660
650 ʵ 585 611 80.0 ʵ 57.8 69.0 89.2 75.5 64.1 ʵ ʵ 650
640 ʵ 578 601 79.8 ʵ 57.3 68.7 89.0 75.1 63.5 77 ʵ 640
630 ʵ 571 591 79.5 ʵ 56.8 68.3 88.8 74.6 63.0 ʵ ʵ 630
620 ʵ 564 582 79.2 ʵ 56.3 67.9 88.5 74.2 62.4 75 ʵ 620
610 ʵ 557 573 78.9 ʵ 55.7 67.5 88.2 73.6 61.7 ʵ ʵ 610
600 ʵ 550 564 78.6 ʵ 55.2 67.0 88.0 73.2 61.2 74 ʵ 600
590 ʵ 542 554 78.4 ʵ 54.7 66.7 87.8 72.7 60.5 ʵ 210 590
580 ʵ 535 545 78.0 ʵ 54.1 66.2 87.5 72.1 59.9 72 206 580
570 ʵ 527 535 77.8 ʵ 53.6 65.8 87.2 71.7 59.3 ʵ 202 570
560 ʵ 519 525 77.4 ʵ 53.0 65.4 86.9 71.2 58.6 71 199 560
550 505 512 517 77.0 ʵ 52.3 64.8 86.6 70.5 57.8 ʵ 195 550
540 496 503 507 76.7 ʵ 51.7 64.4 86.3 70.0 57.0 69 190 540
530 488 495 497 76.4 ʵ 51.1 63.9 86.0 69.5 56.2 ʵ 186 530
520 480 487 488 76.1 ʵ 50.5 63.5 85.7 69.0 55.6 67 183 520
510 473 479 479 75.7 ʵ 49.8 62.9 85.4 68.3 54.7 ʵ 179 510
500 465 471 471 75.3 ʵ 49.1 62.2 85.0 67.7 53.9 66 174 500
490 456 460 460 74.9 ʵ 48.4 61.6 84.7 67.1 53.1 ʵ 169 490
480 448 452 452 74.5 ʵ 47.7 61.3 84.3 66.4 52.2 64 165 480
470 441 442 442 74.1 ʵ 46.9 60.7 83.9 65.7 51.3 ʵ 160 470
460 433 433 433 73.6 ʵ 46.1 60.1 83.6 64.9 50.4 62 156 460
450 425 425 425 73.3 ʵ 45.3 59.4 83.2 64.3 49.4 ʵ 153 450
440 415 415 415 72.8 ʵ 44.5 58.8 82.8 63.5 48.4 59 149 440
430 405 405 405 72.3 ʵ 43.6 58.2 82.3 62.7 47.4 ʵ 144 430
420 397 397 397 71.8 ʵ 42.7 57.5 81.8 61.9 46.4 57 140 420
410 388 388 388 71.4 ʵ 41.8 56.8 81.4 61.1 45.3 ʵ 136 410
400 379 379 379 70.8 ʵ 40.8 56.0 81.0 60.2 44.1 55 131 400
390 369 369 369 70.3 ʵ 39.8 55.2 80.3 59.3 42.9 ʵ 127 390
380 360 360 360 69.8 ʢ110.0ʣ 38.8 54.4 79.8 58.4 41.7 52 123 380

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