Stop replacing disc harrow bearings every season – ST627A lasts 3x longer in abrasive soil conditions (based on field tests).
The W211PPB4 replacement that survives the field – engineered for real agricultural conditions.
Why Standard Bearings Fail (And What It Costs You)
| Failure Cause | Field Impact |
|---|---|
| Abrasive soil contamination | Premature wear, rough rotation |
| Moisture & fertilizer corrosion | Seal breakdown, bearing seizure |
| Heavy shock loads | Raceway damage, cage failure |
| Seal failure under rotation | Lubricant loss, rapid failure |
Result: Standard W211PPB4 bearings often fail within one season, increasing warranty cost and reducing OEM reliability perception.
The ST627A Advantage – Engineered for Field Survival
| Feature | Customer Benefit |
|---|---|
| Direct bolt-on replacement | No engineering changes – fast installation |
| Multi-lip heavy-duty seal | Blocks dust, mud, fertilizer intrusion |
| High-grade bearing steel | Withstands shock loads in rocky fields |
| Pre-greased sealed unit | Ready to install – no field lubrication required |
| 1000+ hour field life | Reduces replacement frequency and downtime |
Performance Comparison
Based on field tests in abrasive soil conditions with typical disc harrow duty cycles (clay soil + fertilizer exposure).
| Feature | Standard W211PPB4 | ST627A |
|---|---|---|
| Seal System | Basic seal | Multi-lip heavy-duty seal |
| Field Life | 300–500 hours | 1000+ hours |
| Shock Load Resistance | Medium | High |
Higher upfront cost? Yes. Lower cost per hour in the field? Absolutely.
Technical Specifications For ST627A/W211PPB4 Disc Harrow Bearing
| Model | ST627A |
|---|---|
| Interchange | W211PPB4 / DS211TT4 |
| Bore Size | 2.188 inch (Round Bore) |
| Application | Disc Harrow |
| Material | High-grade bearing steel |
| Seal Type | Multi-lip sealing system |
| Lubrication | Pre-greased sealed unit |
Quality & Supply Assurance
- ISO 9001 certified manufacturing
- 100% inspection before shipment
- Batch traceability for warranty control
- Export-grade packaging
- Stable OEM bulk supply capability
Field Test Result
Europe-based Agricultural Distributor Case:
A Europe-based agricultural distributor tracked 2,000+ bearings over two seasons – warranty claims dropped 47% after switching to ST627A.
Heavy Soil Validation:
Tested in clay soil with fertilizer exposure – achieved 1,200 hours without seal failure.
Frequently Asked Questions
1.Is ST627A a direct replacement for W211PPB4?
Yes. Same bore size and mounting dimensions. No modification required.
2.Do you provide samples?
Yes – sample units are available for field testing before bulk order.
3.What is the lead time?
15–25 working days for OEM orders. Stock available for small volumes.
4.Can you provide OEM branding?
Yes, custom packaging and branding supported.
5.What is the warranty?
12 months standard. Extended warranty available for OEM contracts.
Field test results based on specific soil conditions and duty cycles. Actual performance may vary. Contact our engineering team for application-specific recommendations.
