Needle bearing
Needle bearing is a cylindrical roller bearing, relative to its diameter, the roller is both thin and long this roller called needle although has a smaller section, bearing still has a higher load bearing capacity, needle bearing is equipped with thin and long roller (roller diameter D 5mm,L/D 2.5,L is the length of roller), so the radial structure is compact, and its inner diameter size and load capacity are the same as other types of bearings, while the outer diameter is the smallest, especially suitable for the radial installation size of the support structure is limited .
Shaft Diameter | Bearing No. | Boundary Dimensions | Basic Load Ratings | Limiting Speed | RNA 49..RS | RNA 49..2RS | d | F | D | C | B | | C | Co | Oil | mm | single sealed | double sealed | mm | min. | N | rpm | 10 | NA 4900 RS | NA 4900.2RS | 10 | 14 | 22 | 13 | 14 | 0.3 | 6800 | 6900 | 13000 | 12 | NA 4901 RS | NA 4901.2RS | 12 | 16 | 24 | 13 | 14 | 0.3 | 7600 | 8300 | 12000 | 15 | NA 4902 RS | NA 4902.2RS | 15 | 20 | 28 | 13 | 14 | 0.3 | 8600 | 10300 | 10000 | 17 | NA 4903 RS | NA 4903.2RS | 17 | 22 | 30 | 13 | 14 | 0.3 | 8800 | 11000 | 9000 | 20 | NA 4904 RS | NA 4904.2RS | 20 | 25 | 37 | 17 | 18 | 0.3 | 17300 | 19900 | 7500 | 25 | NA 4905 RS | NA 4905.2RS | 25 | 30 | 42 | 17 | 18 | 0.3 | 19300 | 24200 | 6500 | 30 | NA 4906 RS | NA 4906.2RS | 30 | 35 | 47 | 17 | 18 | 0.3 | 21100 | 28500 | 5500 | 35 | NA 4907 RS | NA 4907.2RS | 35 | 42 | 55 | 20 | 21 | 0.6 | 26500 | 39500 | 4800 | 40 | NA 4908 RS | NA 4908.2RS | 40 | 48 | 62 | 22 | 23 | 0.6 | 36000 | 53000 | 4200 | 45 | NA 4909 RS | NA 4909.2RS | 45 | 52 | 68 | 22 | 23 | 0.6 | 38000 | 59000 | 3900 | 50 | NA 4910 RS | NA 4910.2RS | 50 | 58 | 72 | 22 | 23 | 0.6 | 40000 | 64000 | 3500 |
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