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） | ||
| NA4940 | 200 | 280 | 80 | 518 | 1120 | 15.4 | open |
| NA4944 | 220 | 300 | 80 | 536 | 1200 | 16.7 | open |
| NA4948 | 240 | 320 | 80 | 565 | 1320 | 18 | open |
| NA4952 | 260 | 360 | 100 | 847 | 1900 | 31.1 | open |
| NA4956 | 280 | 380 | 100 | 877 | 2040 | 33.1 | open |
| NA4960 | 300 | 420 | 118 | 1130 | 2650 | 51.4 | open |
| NA4964 | 320 | 440 | 118 | 1170 | 2830 | 54.4 | open |
| NA4968 | 340 | 460 | 118 | 1220 | 3020 | 57.3 | open |
| NA4972 | 360 | 480 | 118 | 1260 | 3200 | 60.2 | open |
| NA4976 | 380 | 520 | 140 | 1540 | 4030 | 90.3 | open |
| NA4980 | 400 | 540 | 140 | 1590 | 4270 | 94.4 | open |
| NA4984 | 420 | 560 | 140 | 1640 | 4510 | 98.5 | open |
| NA4988 | 440 | 600 | 160 | 1910 | 5140 | 131 | open |
| RNA6900 | 14 | 22 | 22 | 16.3 | 20.9 | 0.027 | open |
| RNA6901 | 16 | 24 | 22 | 17.1 | 23 | 0.03 | open |
| RNA6902 | 20 | 28 | 23 | 19.3 | 28.7 | 0.037 | open |
| RNA6903 | 22 | 30 | 23 | 20.8 | 32.5 | 0.0405 | open |
| RNA6904 | 25 | 37 | 30 | 35.4 | 48.8 | 0.0955 | open |
| RNA69/22 | 28 | 39 | 30 | 36.3 | 56.9 | 0.0975 | open |
| RNA6905 | 30 | 42 | 30 | 42.1 | 64.2 | 0.111 | open |
