Open type needle roller bearings, specifically referring to needle roller bearings with completely open ends and no self sealing/closed end caps (especially common in the stamped outer ring HK series), are an economical choice for compact radial heavy-duty scenarios, different from the single-sided closed BK type and the 2RS type with sealing rings.
| Model | Basic Dimensions | Basic rated dynamic load | Weight | Type | |||
|---|---|---|---|---|---|---|---|
| Inner diameter | Outer diameter | Thickness | Dynamic load | Static load | |||
| [mm] | [mm] | [mm] | (kN) | (kN) | （kg） | ||
| RNA4984 | 470 | 560 | 140 | 1640 | 4510 | 61.2 | open |
| RNA4988 | 490 | 600 | 160 | 1910 | 5140 | 86.9 | open |
| NA495 | 5 | 13 | 10 | 2.96 | 2.69 | 0.0073 | open |
| NA496 | 6 | 15 | 10 | 3.9 | 3.4 | 0.0091 | open |
| NA497 | 7 | 17 | 10 | 4.5 | 3.6 | 0.0112 | open |
| NA498 | 8 | 19 | 11 | 6.2 | 5 | 0.015 | open |
| NA499 | 9 | 20 | 11 | 6.6 | 6.3 | 0.0167 | open |
| NA4900 | 10 | 22 | 13 | 9.2 | 10.1 | 0.024 | open |
| NA4901 | 12 | 24 | 13 | 9.7 | 11.1 | 0.0265 | open |
| NA4902 | 15 | 28 | 13 | 10.9 | 13.8 | 0.035 | open |
| NA4903 | 17 | 30 | 13 | 11.8 | 15.6 | 0.039 | open |
| NA4904 | 20 | 37 | 17 | 21 | 25 | 0.0785 | open |
| NA49/22 | 22 | 39 | 17 | 21.4 | 28.8 | 0.087 | open |
| NA4905 | 25 | 42 | 17 | 23.7 | 30.7 | 0.0925 | open |
| NA49/28 | 28 | 45 | 17 | 24.5 | 32.7 | 0.101 | open |
| NA4906 | 30 | 47 | 17 | 25.2 | 34.7 | 0.106 | open |
| NA49/32 | 32 | 52 | 20 | 31.3 | 47.9 | 0.165 | open |
| NA4907 | 35 | 55 | 20 | 32 | 50.2 | 0.178 | open |
| NA4908 | 40 | 62 | 22 | 41.6 | 67.4 | 0.245 | open |
| NA4909 | 45 | 68 | 22 | 43.5 | 73.4 | 0.285 | open |
