The SCHNEEBERGER range of recirculating units offers you perfect solutions for your specific applications.
Assessment of the advantages
Parameter: Low displacement force and high smoothness
| Rolling element | SK | SKD | SKC | SR | NRT |
|---|---|---|---|---|---|
| - Balls | +++ | ++++ | ++++ | n/a | n/a |
| - Rollers | n/a | n/a | n/a | ++ | ++ |
Parameter: High load capacity
| Rolling element | SK | SKD | SKC | SR | NRT |
|---|---|---|---|---|---|
| - Balls | ++ | ++ | + | n/a | n/a |
| - Rollers | n/a | n/a | n/a | +++ | ++++ |
Legend
++++ very good | +++ good | ++ moderate | + fair | n/a not applicable
Performance parameters
| Parameter | SK | SKD | SKC | SR | NRT |
|---|---|---|---|---|---|
| Max. acceleration (m/s²) | 50 | 50 | 50 | 50 | 50 |
| Max. velocity (m/s) | 2 | 2 | 2 | 2 | 1 |
| Operating temperature (°C) | -40 to +80 | -40 to +80 | -150 to +200 | -40 to +80 | -40 to +80 |
Materials
| Component | SK | SKD | SKC | SR | NRT |
|---|---|---|---|---|---|
| Rolling elements Tool steel, hardness (HRC) | 58-64 | 58-64 (damping elements are plastic) | n/a | 58-64 | 58-64 |
| Ceramic rolling elements (ceramic balls with PTFE balls between) | n/a | n/a | ✓ | n/a | n/a |
| Deflection unit | Sizes 1, 2, 9 and 12: anodized aluminium Sizes 3 and 6: plastic or aluminium depending on length | Plastic or aluminium depending on length | Tool steel, coated | Plastic or aluminium depending on length | Plastic |
Special versions
| Special version | Code | SK | SKD | SKC | SR | NRT |
|---|---|---|---|---|---|---|
| Height-matched | GP | ✓ | ✓ | ✓ | ✓ | ✓ |
| Central lubrication connection | ZS | n/a | n/a | n/a | n/a | ✓ |
Product features
SK Series
Standard ball recirculating units, offering balanced performance and cost-effectiveness
SKD Series
Ball recirculating units with damping elements, providing excellent smoothness and noise reduction
SKC Series
High-temperature ball recirculating units, capable of operating in extreme temperatures from -150°C to +200°C
SR Series
Roller recirculating units, offering good load capacity and smooth operation
NRT Series
High-load roller recirculating units with maximum load carrying capacity
Application guide
Select the appropriate recirculating unit type based on your application requirements:
- High-speed precision applications - Choose SKD (damped) or SKC (high-temperature) for optimal smoothness
- Standard automation applications - SK series offers the best value
- High-load applications - NRT series roller recirculating units have the highest load capacity
- Extreme temperature environments - SKC series can withstand temperatures from -150°C to +200°C
- Medium-load applications - SR series roller recirculating units provide balanced performance