BK/BMK are both metric sealed stamped outer ring needle roller bearings. BK is a standard sealed type with a cage, while BMK is a fully loaded roller sealed type with one end closed and the other end open. They are suitable for shaft end installation and can withstand small unidirectional axial forces. The structure is compact and has strong radial bearing capacity, making it suitable for metric equipment transmission systems with limited installation space.
| Model | Basic Dimensions | Basic rated dynamic load | Weight | Type | |||
|---|---|---|---|---|---|---|---|
| Inner diameter | Outer diameter | Thickness | Dynamic load | Static load | |||
| [mm] | [mm] | [mm] | (kN) | (kN) | （kg） | ||
| BMK5040 | 50 | 62 | 40 | 76.5 | 157 | 0.23 | BK BMK sealing type |
| BMK5045ZW | 50 | 62 | 45 | 76.7 | 158 | 0.245 | BK BMK sealing type |
| BK5520 | 55 | 63 | 20 | 29.8 | 69.4 | 0.0985 | BK BMK sealing type |
| BK5525 | 55 | 63 | 25 | 38.3 | 95.7 | 0.118 | BK BMK sealing type |
| BK5528 | 55 | 63 | 28 | 44 | 103 | 0.105 | BK BMK sealing type |
| BMK5520 | 55 | 67 | 20 | 39.6 | 69.7 | 0.136 | BK BMK sealing type |
| BMK5525 | 55 | 67 | 25 | 51.2 | 97 | 0.165 | BK BMK sealing type |
| BMK5530 | 55 | 67 | 30 | 62 | 124 | 0.195 | BK BMK sealing type |
| BMK5540 | 55 | 67 | 40 | 80 | 172 | 0.25 | BK BMK sealing type |
| BMK5545ZW | 55 | 67 | 45 | 79.9 | 172 | 0.27 | BK BMK sealing type |
| BMK5550ZW | 55 | 67 | 50 | 91.5 | 205 | 0.3 | BK BMK sealing type |
| BK6012 | 60 | 68 | 12 | 17.4 | 32 | 0.049 | BK BMK sealing type |
| BK6020 | 60 | 68 | 20 | 33.5 | 75 | 0.081 | BK BMK sealing type |
| BK6032 | 60 | 68 | 32 | 53 | 135 | 0.136 | BK BMK sealing type |
| BMK6025 | 60 | 72 | 25 | 54.7 | 108 | 0.182 | BK BMK sealing type |
| BMK6030 | 60 | 72 | 30 | 66.3 | 139 | 0.215 | BK BMK sealing type |
| BMK6040 | 60 | 72 | 40 | 85.7 | 193 | 0.275 | BK BMK sealing type |
| BMK6045ZW | 60 | 72 | 45 | 85.4 | 193 | 0.295 | BK BMK sealing type |
| BMK6050ZW | 60 | 72 | 50 | 97.8 | 229 | 0.33 | BK BMK sealing type |
| BMK6212 | 62 | 74 | 12 | 20.1 | 30.3 | 0.107 | BK BMK sealing type |
