Page 127 - needle bearings
P. 127
Machined-ring needle roller bearings
NTN
ra
ПDa
FW 225ʙ490mm
Boundary dimensions Basic load ratings Limiting speeds Bearing Abutment Mass
and fillet
dynamic static dynamic static numbers dimensions
mm N kgf r/min mm kg
grease oil Da ras
Fw D Be rs min 1ʣ Cr Cor Cr Cor max max (approx.)
225 +0.079 280 80 2.1 505 000 1 180 000 51 500 120 000 1 200 1 800 RNA4940 269 2 7.20
+0.050
240 +0.079 270 50 1.5 242 000 770 000 24 700 78 500 1 100 1 700 RNA4844 262 1.5 3.62
+0.050
245 +0.079 300 80 2.1 525 000 1 270 000 53 500 129 000 1 100 1 600 RNA4944 289 2 7.81
+0.050
300 60 2 360 000 1 080 000 37 000 110 000 1 000 1 500 RNA4848 291 2 5.40
+0.088
265 +0.056
320 80 2.1 540 000 1 350 000 55 000 138 000 1 000 1 500 RNA4948 309 2 8.40
+0.088
285 +0.056 320 60 2 375 000 1 160 000 38 000 119 000 950 1 400 RNA4852 311 2 5.80
+0.088
290 +0.056 360 100 2.1 805 000 1 900 000 82 000 193 000 950 1 400 RNA4952 349 2 15.90
+0.088
305 +0.056 350 69 2 455 000 1 300 000 46 500 133 000 850 1 300 RNA4856 341 2 9.30
+0.088
310 +0.056 380 100 2.1 835 000 2 030 000 85 000 207 000 850 1 300 RNA4956 369 2 16.70
330 +0.098 380 80 2.1 625 000 1 770 000 64 000 180 000 800 1 200 RNA4860 369 2 12.70
+0.062
340 +0.098 420 118 3 1 080 000 2 640 000 110 000 269 000 800 1 200 RNA4960 407 2.5 24.00
+0.062
+0.098
350 +0.062 400 80 2.1 640 000 1 850 000 65 500 189 000 750 1 100 RNA4864 389 2 13.40
360 +0.098 440 118 3 1 120 000 2 820 000 114 000 288 000 750 1 100 RNA4964 427 2.5 25.20
+0.062
370 +0.098 420 80 2.1 655 000 1 940 000 66 500 197 000 750 1 100 RNA4868 409 2 14.00
+0.062
380 +0.098 460 118 3 1 160 000 3 000 000 118 000 305 000 750 1 100 RNA4968 447 2.5 26.50
+0.062
390 +0.098 440 80 2.1 665 000 2 020 000 68 000 206 000 650 1 000 RNA4872 429 2 14.80
+0.062
400 +0.108 480 118 3 1 200 000 3 200 000 122 000 325 000 650 1 000 RNA4972 467 2.5 28.20
+0.068
+0.108
415 +0.068 480 100 2.1 1 000 000 2 840 000 102 000 289 000 650 950 RNA4876 469 2 26.00
430 +0.108 520 140 4 1 400 000 3 750 000 143 000 385 000 650 950 RNA4976 504 3 38.60
+0.068
450 +0.108 540 140 4 1 450 000 4 000 000 148 000 410 000 600 900 RNA4980 524 3 40.10
+0.068
470 +0.108 560 140 4 1 500 000 4 250 000 153 000 430 000 550 850 RNA4984 544 3 51.60
+0.068
+0.108
490 +0.068 600 160 4 1 750 000 4 600 000 179 000 470 000 550 800 RNA4988 584 3 66.90
Note 1) Allowable minimum chamfer dimension r.
B-65
