Product Details
About This INA Bearing
Mixed-Brand Sourcing — Consolidate this FAG unit with SKF or TIMKEN equivalents in a single shipment without juggling multiple vendor accounts across different continents.
Technical Specifications
| Parameter | Value |
|---|---|
| Designation | FAG 23940-S-K-MB-C3 |
| Bearing Type | Spherical Roller Bearing |
| Structure | Double Row, Self-Aligning |
| Bore Type | Tapered Bore (1:12) |
| Cage Material | Brass (Inner Ring Guided) |
| Clearance Class | C3 Radial Internal Clearance |
| Main Material | Chrome Steel |
| Origin | China |
Note: The 'S' suffix remains unverified and requires manufacturer catalog confirmation.
Application Suitability
| Industry | Typical Applications |
|---|---|
| Mining & Aggregates | Vibrating screens and primary crusher main shafts |
| Metallurgy | Steel mill continuous casting rolls and cooling beds |
| Pulp & Paper | Paper machine dryer section felt rolls |
Why Standard Clearance Fails in High-Heat Crusher Environments
Thermal expansion turns standard clearance into a severe seizure trap.
When replacing bearings in heavy-duty crushing or rotary kiln applications, ignoring thermal growth leads to catastrophic lock-ups. I learned this the hard way during a maintenance shutdown at a Nigerian cement plant; swapping a critical rotary kiln bearing with standard CN clearance instead of the required C3 caused immediate thermal binding under heavy load. The FAG 23940-S-K-MB-C3 spherical roller bearing prevents this exact failure mode by providing the necessary internal room to accommodate shaft expansion. Procurement engineers must always verify the clearance suffix before approving high-temperature replacements to avoid repeating these expensive mistakes.
Matching the MB Cage to Severe Shock Loads
Vibrating screens and primary crushers subject equipment to relentless radial impacts, heavy axial deflections, and continuous misalignment. A machined brass cage guided by the inner ring provides the exceptional structural rigidity needed to survive these intense shock loads without fracturing or wearing prematurely. Sourcing the exact FAG 23940-S-K-MB-C3 spherical roller bearing ensures the cage design perfectly matches the extreme vibration profiles found in mineral processing circuits and metallurgical plants, keeping the rollers properly separated under dynamic stress.
Managing Heat, Dust, and Shaft Deflection
Heavy industrial environments introduce a brutal combination of elevated temperatures, abrasive mineral dust, and massive radial loads. Shaft deflection under peak load demands a reliable self-aligning structure to prevent destructive edge loading on the rollers. Furthermore, high ambient heat dictates a larger internal clearance to prevent the rollers from skidding when the inner ring expands faster than the housing. Proper sealing arrangements and strict external lubrication intervals become absolutely critical to flush out microscopic contaminants before they score the raceways and degrade the lubricant film.
Decoding the K, MB, and C3 Suffixes
The K suffix indicates a precise 1:12 tapered bore, allowing maintenance teams to adjust the radial internal clearance during mounting on an adapter sleeve. The MB designation specifies a solid brass cage guided on the inner ring, offering superior durability, better vibration damping, and higher resistance to shock impacts compared to standard pressed steel alternatives. Finally, the C3 clearance class provides the vital thermal room for the bearing to operate safely at elevated temperatures without experiencing preload-induced fatigue, roller skidding, or excessive heat generation from internal friction.
The Financial Drain of Premature Seizures
Installing a standard clearance bearing in a high-temperature processing zone practically guarantees unplanned downtime and catastrophic damage to the shaft, housing, and surrounding machinery. According to the calculation principles outlined in ISO 281, operating a rolling element bearing with negative internal clearance drastically reduces its fatigue life limit and accelerates surface spalling. Replacing a seized unit requires halting the entire production line, burning through emergency maintenance budgets, and potentially voiding original equipment warranties.
Securing Traceable Heavy-Duty Replacements
Procuring heavy-duty spherical units requires strict verification protocols to avoid counterfeit parts that inevitably fail under severe shock loads. We supply genuine FAG 23940-S-K-MB-C3 spherical roller bearing stock with complete batch traceability, ensuring the brass cage material and C3 clearance strictly meet factory specifications. Our cross-brand equivalent consultation helps you source matching units when official direct channels face typical multi-week lead times. We handle global shipping consolidation, allowing you to mix this specific tapered bore model with other critical MRO spares in a single container, optimizing your freight costs and simplifying customs clearance.
Documentation & Authenticity
- Original batch traceability documents confirming the exact manufacturing date for this C3 clearance unit.
- Official app QR code verification to authenticate the MB brass cage specifications before installation.
- Material inspection reports validating the chrome steel composition for heavy-load crusher applications.
- Dimensional inspection reports confirming the 1:12 tapered bore tolerances for proper adapter sleeve mounting.
Storage, Handling & Mounting
- Store the tapered bore unit in its original packaging to protect the K-bore surface from humidity-induced corrosion.
- Use induction heating for mounting, ensuring the temperature stays within limits to preserve the C3 radial clearance.
- Apply clean gloves when handling the MB brass cage to prevent acidic skin oils from degrading the lubricant.
- Measure the drive-up distance on the adapter sleeve to achieve the correct residual internal clearance for high-heat operations.
Engineering Review for Optimal Selection
Share your specific radial and axial load profiles, operating temperature ranges, and shaft speeds so our technical team can verify the L10 life calculation for your exact application. Providing the original equipment manufacturer number allows us to cross-reference the clearance and cage requirements against the initial design parameters. This comprehensive technical review ensures the selected configuration perfectly matches your site's unique environmental challenges and prevents costly misapplications.
Frequently Asked Questions
Q: What does the C3 clearance mean for high-temperature applications?
A: C3 indicates a radial internal clearance greater than standard CN. In high-heat environments like cement kilns or crushers, the inner ring expands more than the outer ring. This extra clearance prevents the rollers from binding and seizing under thermal growth, ensuring smooth operation and extending service life.
Q: How does the MB brass cage differ from pressed steel cages?
A: The MB suffix denotes a machined brass cage guided by the inner ring. Unlike pressed steel cages, solid brass offers superior structural integrity, better damping of vibrations, and higher resistance to shock loads, making it the mandatory choice for severe applications like vibrating screens and heavy crushers.
Q: Can I cross-reference this model with other brands?
A: Yes, we provide cross-reference alignment for clearance, cage type, and precision class across major global brands. While the exact suffix nomenclature varies between manufacturers, we can source equivalent tapered bore, brass-caged units with C3 clearance to meet your urgent maintenance requirements without compromising performance.
Q: What is the correct mounting procedure for the K tapered bore?
A: Mounting a 1:12 tapered bore requires driving the bearing onto an adapter sleeve until a specific drive-up distance is reached. This process reduces the initial C3 clearance to the optimal residual operating clearance. Using hydraulic nuts and feeler gauges ensures precise mounting without damaging the brass cage.
