NA/NKI Series (With Inner Ring)
Cage Type: Steel / Brass Cage
Material: Bearing Steel (Gcr15)
Precision: P0, P6, P5
Structure: Open / Single Row / With Inner Ring
Bore Range: 5mm – 100mm
Outer Diameter: 16mm – 130mm
Application: Conveyor systems, agricultural machinery, construction equipment, industrial robots
WhatsApp: +86 18663551233
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NA and NKI series needle roller bearings include a precision-ground inner ring, providing a complete bearing unit ready for installation without requiring a hardened shaft. The inner ring ensures optimal raceway geometry and consistent running accuracy. These bearings handle both high radial loads and moderate axial loads, making them suitable for conveyor rollers, agricultural machinery, and robotic joint applications.
Technical Specifications
| Bearing No. | Bore (d/Fw) mm | Outer Dia. (D) mm | Width (B/C) mm | Dyn. Load Cr (kN) | Stat. Load Cor (kN) | Ref. Speed (rpm) | Weight (kg) |
|---|---|---|---|---|---|---|---|
| NA4900 | 10 | 22 | 13 | 8.80 | 10.2 | 18000 | 0.025 |
| NA4901 | 12 | 24 | 13 | 9.55 | 11.4 | 16000 | 0.028 |
| NA4902 | 15 | 28 | 13 | 11.1 | 14.0 | 14000 | 0.035 |
| NA4903 | 17 | 30 | 13 | 11.9 | 15.3 | 13000 | 0.038 |
| NA4904 | 20 | 37 | 17 | 17.8 | 24.0 | 11000 | 0.072 |
| NA4905 | 25 | 42 | 17 | 20.1 | 28.5 | 9500 | 0.082 |
| NA4906 | 30 | 47 | 17 | 22.4 | 33.5 | 8500 | 0.093 |
| NA4907 | 35 | 55 | 20 | 30.8 | 48.0 | 7000 | 0.160 |
| NA4908 | 40 | 62 | 22 | 39.6 | 62.0 | 6300 | 0.220 |
| NA4909 | 45 | 68 | 22 | 42.9 | 70.0 | 5600 | 0.250 |
| NA4910 | 50 | 72 | 22 | 46.8 | 78.0 | 5300 | 0.280 |
| NA4911 | 55 | 80 | 25 | 58.3 | 98.0 | 4800 | 0.380 |
| NA4912 | 60 | 85 | 25 | 61.6 | 106 | 4500 | 0.410 |
| NA4913 | 65 | 90 | 25 | 64.9 | 114 | 4200 | 0.450 |
| NA4914 | 70 | 100 | 30 | 82.5 | 150 | 3800 | 0.680 |
