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Needle Roller Bearings With Inner Ring

BWK needle roller bearings with an inner ring provide a complete precision raceway solution when the shaft surface cannot be hardened or ground for direct roller contact.
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  • NKI9/12, NA4900A, NAVP5900M/P6S1, NA4901A, NA4902A, NA153312, NA4903, NA173017, NKI20/16, NKI20/20, NA203316, NAO203517, NA4904, NKI22/16, NA49/22, NA49/22/P6, NKI25/20, NA4905, NKI28/20

  • BWK

Product Details

Needle Roller Bearings With Inner Ring

Needle roller bearings with an inner ring are used where the shaft cannot serve directly as the rolling raceway. The matched inner ring provides a precision raceway surface and supports reliable operation across a wide range of industrial equipment.


Structure and Features

  • Precision inner ring included

  • High radial load capacity

  • Suitable for shafts without prepared raceways

  • Compact complete bearing arrangement

  • Wide NA and NKI series range

Series: NA, NKI


Applications

Suitable for industrial gearboxes, machine tools, pumps, compressors, agricultural machinery and other equipment requiring a complete needle bearing assembly.


微信图片_20260825223547_118_21

Technical Data

Shaft Diameter (mm) Current Designation Original Designation d (mm) D (mm) B (mm) Dynamic Load Cr (N) Static Load Cor (N) Grease Speed (rpm) Oil Speed (rpm) Weight (kg)
9 NKI9/12
9 19 12 6800 6300 17200 24800 0.01514
10 NA4900A 4524900 10 22 13 5900 7400 14400 21600 0.0273
10 NAVP5900M/P6S1 E54700HT2 10 26 17 7800 8400 14400 21600 0.054
12 NA4901A 4524901 12 24 13 5800 6200 13500 20700 0.026
15 NA4902A 4524902 15 28 13 6100 8600 12000 18000 0.034
15 NA153312
15 33 12 12200 14100 13500 20700 0.0545
17 NA4903 4524903 17 30 13 9200 13500 10000 16000 0.0405
17 NA173017
17 30 17 12000 18900 10000 16000 0.05225
20 NKI20/16
20 32 16 14300 20800 12000 18000 0.04835
20 NKI20/20
20 32 20 17200 26500 12000 18000 0.06293
20 NA203316
20 33 16 14500 21200 12000 18000 0.05675
20 NAO203517 NAF203517 20 35 17 15100 25400 9600 14400 0.0731
20 NA4904 4524904 20 37 17 20600 27700 9600 14400 0.0798
22 NKI22/16 NA223416 22 34 16 13300 21900 9300 14000 0.05
22 NA49/22 45449/22 22 39 17 24000 30300 9100 13600 0.0815
22 NA49/22/P6 E45449/22 22 39 17 21000 29300 9100 13600 0.082
25 NKI25/20
25 38 20 23100 36300 9300 14400 0.0817
25 NA4905 4524905 25 42 17 22900 29600 9300 14000 0.09381
28 NKI28/20 NA284220 28 42 20 24700 39700 8000 14000 0.094
28 NA49/28/P6 E45449/28 28 45 17 20700 29700 8000 11900 0.0984
30 NAO304517 NAF304517 30 45 17 18000 35700 7300 10800 0.01
30 NKI30/20/P6 ENA304520 30 45 20 23200 43700 7300 10800 0.112
30 NA4906
30 47 17 25000 35500 7300 13000 0.101
30 NA4906/P6
30 47 17 23700 36600 7300 10800 0.1115
35 NA4907 4524907 35 55 20 21600 37200 7300 11000 0.17
35 NKIS35 544807 35 58 22 35600 53700 5500 10000 0.22
40 NKI40/20 NA405520 40 55 20 29100 56200 5700 8400 0.142
40 NKI40/30 SZ-413 40 55 30 35200 80700 5700 8400 0.216
40 NA4908 4544908 40 62 22 41100 66600 5400 8000 0.24
45 NKI45/35
45 62 35 52000 108800 5000 7600 0.332
45 NA4909A 4524909 45 68 22 32600 55200 4900 7300 0.271
45 C3GNA456235
45 62 35 42000 58000 4900 7300 0.3098
50 NA4910 45544910 50 72 22 41400 71600 4400 6600 0.274
55 NKI55/35 544711 55 72 35 65900 143500 4300 6400 0.379
55 NA4911A 4524911 55 80 25 38700 74400 4100 6000 0.393
55 NA4911A/C2 C2G4524911 55 80 25 63100 101600 4100 6000 0.4268
60 NA4912A 4524912 60 85 25 41600 82200 3800 50600 0.426
65 NA4913 4524913 65 90 25 42700 87500 3500 5300 0.456
65 NA4913A/P62 C2E4524913 65 90 25 42700 87500 3500 5300 0.4895
70 NKI70/35
70 95 35 78000 184000 3600 6000 0.737
70 NA4914A 4524914 70 100 30 53300 121000 3200 4800 0.728
70 NA4914A/C2 C2G4524914 70 100 30 89300 155800 3200 4800 0.8054
85 NKI85/36 NA8511536 85 115 36 105050 216800 2700 4000 1.04
100 NA4920A 4524920 100 140 40 97100 250400 2200 3200 1.93
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needle roller bearing with inner ring NA needle bearing NKI needle bearing complete needle bearing BWK Bearing