Description
The BK Type bearing housing is a compact support unit for machined ball screw and spindle-drive shafts used in CNC machines, routers and automation systems. The series is available in BK10, BK12, BK15, BK17, BK20 and BK25 sizes, allowing the housing to be selected according to the machined shaft end and installation dimensions.
The units are supplied with radial bearings. For applications requiring greater precision and durability, compatible angular-contact bearing sets can be ordered separately. Use the dimensional drawings and table below to compare models, verify installation dimensions and download the corresponding 3D model for your design.
Dimensions, Models and 3D Downloads
The drawings define the dimension references used in the technical table. Match the required housing size to the corresponding row and use the 3D download link for CAD integration and machine-layout planning.
| Type | Download 3D Model | d | L | L1 | L2 | L3 | B | H | Angular Bearings | b +/-0,02 | h +/-0,02 | B1 | H1 | E | P | C1 | C2 | d3 | d4 | d5 | t | SW | Weight kg | SKU |
| BK 10 | BK10 | 10 | 25 | 5 | 29,5 | 5 | 60 | 39 | / | 30 | 22 | 34 | 32,5 | 15 | 46 | 13 | 6 | 5,5 | 6,3 | 10,5 | 6,5 | 16 | 0,39 | 1012001 |
| BK 12 | BK12 | 12 | 25 | 5 | 29,5 | 5 | 60 | 42 | 7001AC | 30 | 25 | 34 | 32,5 | 18 | 46 | 13 | 6 | 5,5 | 6,3 | 10,5 | 1,5 | 19 | 0,41 | 1012002 |
| BK 15 | BK15 | 15 | 27 | 6 | 32 | 6 | 70 | 47 | 7002AC | 35 | 28 | 38 | 38 | 18 | 54 | 15 | 6 | 5,5 | 6,3 | 10,5 | 6,5 | 22 | 0,57 | 1012003 |
| BK 17 | BK17 | 17 | 35 | 9 | 44 | 7 | 86 | 63 | 7203AC | 43 | 39 | 48 | 55 | 28 | 68 | 19 | 8 | 6,6 | 8,7 | 14 | 8,6 | 24 | 1,27 | 1012004 |
| BK 20 | BK20 | 20 | 35 | 8 | 43 | 8 | 88 | 59 | / | 44 | 34 | 50 | 50 | 22 | 70 | 19 | 8 | 6,6 | 8,7 | 14 | 8,5 | 30 | 1,19 | 1012005 |
| BK 25 | BK25 | 25 | 42 | 12 | 54 | 9 | 106 | 79 | / | 53 | 48 | 62 | 70 | 33 | 85 | 22 | 10 | 9 | 10,7 | 17,5 | 10,8 | 35 | 2,3 | 1012006 |
| All product data (pictures, dimensions, tables, drawings) are provided as received from the supplier; we exclude liability for their accuracy or completeness. | ||||||||||||||||||||||||
BK housings are supplied with radial bearings. If your application requires greater precision and durability, compatible angular-contact bearing sets can be ordered separately: Angular Contact Bearings.
Selection and Installation Notes
The BK support unit is compact and intended to simplify installation in machines where available space is limited. The bearings are greased and adjusted in the housing, reducing the need for additional bearing alignment during installation.
- Model selection: Choose BK10, BK12, BK15, BK17, BK20 or BK25 according to the machined shaft-end dimensions shown above.
- Machine integration: Use the dimensional drawings and downloadable 3D files to verify mounting space before machining or assembly.
- Additional sizes: If you need a BK size not listed in the table or online shop, contact Vallder with the required model or dimensions for availability.
Assembly Examples
The reference images below show typical ball screw support, housing alignment and motor-side assembly arrangements. Use them together with your machine drawing and the dimensional data above when planning the installation.
Supported and fixed side arrangement
Bearing housing mounting
Motor-side mounting example
Typical assembly components