Self-lubricating bushings have revolutionized mechanical engineering by eliminating the need for constant maintenance and external lubrication. Among the most commonly used types are SF-1 and SF-2 bearings — each designed for specific working conditions and performance requirements.
In this blog, we will explore the structural differences, lubrication characteristics, and application scenarios of SF-1 and SF-2 bearings, helping you choose the right type for your machinery.
SF-1 bearings, also known as dry self-lubricating bushings, are engineered for applications where zero external lubrication is required. These bearings feature a three-layer composite structure:
SF-2 bearings are designed for boundary lubrication conditions — meaning they require periodic or minimal lubrication. SF-2 bushings also feature a layered structure:
This design ensures long service life under more demanding environments where SF-1 might not perform as well.
| Feature | SF-1 Bearing | SF-2 Bearing |
|---|---|---|
| Lubrication Type | Dry / Maintenance-free | Boundary lubrication / Grease required |
| Surface Material | PTFE + Lead | POM with oil grooves |
| Maintenance Requirement | None | Periodic lubrication |
| Load Capacity | Medium | Higher with lubrication |
| Friction Coefficient | Very low | Moderate |
| Suitable Environment | Clean, dry | Harsh, dusty, outdoor |
| Cost Efficiency | Higher initial cost, no maintenance cost | Lower cost, requires occasional upkeep |
Choosing the right self-lubricating bearing depends on your specific application:
If you’re switching from traditional bronze or steel bushings, SF-2 often offers better load performance at lower cost. If maintenance reduction is your top priority, SF-1 is the ideal upgrade.
We specialize in manufacturing and exporting both SF-1 and SF-2 self-lubricating bushings for global OEMs and industrial distributors. Here's what we offer:
Looking for a reliable SF-1 or SF-2 bearing manufacturer?We’re here to help you choose the best solution for your application. Contact us（[email protected]）today for samples, datasheets, and technical guidance.
