Description
These matched angular contact ball bearing sets are intended for precision ball screw support assemblies where the shaft must be located accurately while carrying combined radial and axial loads. Each set contains two factory-paired bearings with the specified preload and is intended to be installed as a matched pair. The available 7001AC, 7002AC and 7203AC sets cover common 12 mm, 15 mm and 17 mm support-shaft sizes used with BK, FK and selected RBK ball screw supports.
Angular contact bearing geometry transfers load through the raceways at a contact angle, making this bearing type suitable for applications that require axial guidance together with radial load capacity. In a preloaded matched arrangement, axial and radial displacement can be reduced and support rigidity increased, which is especially useful for CNC ball screws where positioning repeatability depends on a stable fixed-end bearing arrangement.
Dimensions and Technical Data
The drawing and table below identify the dimensions, precision class, compatible Vallder support families and individual SKU for each bearing set.
| Model | D [mm] | B [mm] | d [mm] | 2B [mm] | Precision class | Compatible Ball Screw Support | SKU |
| Angular Bearings 7001AC | 28 | 8 | 12 | 16 | P5 | BK12 / FK12 / RBK12-57 | 1202001 |
| Angular Bearings 7002AC | 32 | 9 | 15 | 18 | P5 | BK15 / FK15 / RBK15-xx | 1202002 |
| Angular Bearings 7203AC | 40 | 12 | 17 | 24 | P5 | BK17 / FK17 / RBK17-xx | 1202003 |
| All product data (pictures, dimensions, tables, drawings) are provided as received from the supplier; we exclude liability for their accuracy or completeness. | |||||||
Matched set: two bearings are supplied together as a factory-ground, preloaded pair. Keep the two bearings together as one set during storage and installation.
Why Angular Contact Bearings for Ball Screws
Ball screw fixed-end supports need more than simple radial guidance. The support must locate the screw axially, resist thrust generated during feed motion and maintain sufficient rigidity to limit displacement under load. Angular contact ball bearings are designed for combined radial and axial loading, while paired arrangements can support the locating function required in precision machine axes.
- Combined load capability: supports radial load together with significant axial load through the bearing contact angle.
- Axial location: helps control ball screw movement along the shaft axis in a fixed-end support arrangement.
- Preloaded matched pair: factory matching provides the intended relationship between the two bearings when assembled in the prescribed order.
- Higher support rigidity: preload reduces internal movement and can reduce bearing displacement under working load.
- Precision-oriented construction: all listed sets are specified as P5 precision class in the supplier data.
Application:
Suitable for fixed-end ball screw supports in CNC routers, milling machines, engraving systems, automation axes and other linear-motion assemblies using compatible BK, FK or RBK support housings.
Model Selection
Select the bearing set by the required bearing bore diameter and the corresponding support housing. Confirm the exact support model before ordering; the compatibility entries below reproduce the currently supplied product data.
| Model | Bore d | Typical Vallder support compatibility | SKU |
|---|---|---|---|
| 7001AC | 12 mm | BK12 / FK12 / RBK12-57 | 1202001 |
| 7002AC | 15 mm | BK15 / FK15 / RBK15-xx | 1202002 |
| 7203AC | 17 mm | BK17 / FK17 / RBK17-xx | 1202003 |
All product data (pictures, dimensions, tables, drawings) are provided as received from the supplier; we exclude liability for their accuracy or completeness.
Matched-Pair Assembly
Matched angular contact bearings rely on their prepared pairing and orientation to achieve the intended preload. Do not mix individual bearings from different sets. Keep each supplied pair together and preserve its original order and direction during assembly.
The supplied paired bearings are marked so their matching marks form a continuous V when correctly aligned. During installation, align the marks as shown. Incorrect order or orientation can alter the intended preload relationship of a matched set.
Installation note: Bearing preload is sensitive to assembly condition. Avoid adding arbitrary extra preload by overtightening the bearing stack; excessive preload can increase operating torque and temperature and reduce bearing life.
Handling and Installation Guidance
- Keep the pair together: store, clean and install both bearings as the original matched set.
- Maintain cleanliness: prevent chips, abrasive dust and other contamination from reaching the raceways during assembly.
- Apply mounting force correctly: do not transmit installation force through the balls from one ring to the other.
- Check support components: mating shaft shoulders, spacers, nuts and housing seats should be clean and free from damage or burrs.
- Verify rotation after assembly: the screw and support should rotate smoothly without abnormal binding before the axis is put into service.
FAQ frequently asked questions
Why are these bearings supplied as a pair?
The two bearings are factory matched with the intended preload relationship. Keeping them together preserves the prepared geometry of the set.
Can I mix one bearing from one set with another set?
No. Use each supplied pair as one matched set unless the bearing manufacturer specifically provides a universal matching specification.
How do I choose between 7001AC, 7002AC and 7203AC?
Choose according to the required bore diameter and the support housing: 12 mm for 7001AC, 15 mm for 7002AC and 17 mm for 7203AC, then confirm the listed support compatibility.
What does P5 mean in the table?
P5 is the precision class stated in the supplier data for all three listed bearing sets.
Why is preload important in a ball screw support?
Proper preload can reduce internal movement and increase bearing arrangement rigidity, helping the fixed-end support locate the ball screw more consistently under load.
Should I add extra preload during installation?
Do not add arbitrary extra preload. Excessive preload can increase frictional torque, heat and bearing stress. Assemble the matched pair according to the support design and its mounting requirements.