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） | ||
| NA4910 | 50 | 72 | 22 | 46.2 | 82.1 | 0.295 | open |
| NA4911 | 55 | 80 | 25 | 57.6 | 97.3 | 0.41 | open |
| NA4912 | 60 | 85 | 25 | 60.1 | 104.9 | 0.44 | open |
| NA4913 | 65 | 90 | 25 | 62.8 | 113.8 | 0.47 | open |
| NA4914 | 70 | 100 | 30 | 83.2 | 157.9 | 0.765 | open |
| NA4915 | 75 | 105 | 30 | 86.2 | 169.7 | 0.81 | open |
| NA4916 | 80 | 110 | 30 | 87.4 | 174.6 | 0.855 | open |
| NA4917 | 85 | 120 | 35 | 109.8 | 244.2 | 1.28 | open |
| NA4918 | 90 | 125 | 35 | 112.8 | 257.9 | 1.35 | open |
| NA4919 | 95 | 130 | 35 | 116.7 | 270.7 | 1.42 | open |
| NA4920 | 100 | 140 | 40 | 145 | 329 | 1.96 | open |
| NA4922 | 110 | 150 | 40 | 152 | 357 | 2.12 | open |
| NA4924 | 120 | 165 | 45 | 187 | 435 | 2.96 | open |
| NA4926 | 130 | 180 | 50 | 216 | 540 | 4.03 | open |
| NA4928 | 140 | 190 | 50 | 224 | 580 | 4.29 | open |
| NA4930 | 150 | 210 | 60 | 324 | 712 | 6.38 | open |
| NA4932 | 160 | 220 | 60 | 337 | 761 | 6.75 | open |
| NA4934 | 170 | 230 | 60 | 347 | 810 | 7.11 | open |
| NA4936 | 180 | 250 | 69 | 434 | 989 | 10.2 | open |
| NA4938 | 190 | 260 | 69 | 440 | 1020 | 10.7 | open |
