Description
Authorized Channel Sourcing — Every FAG GE280-DO-2RS-A-C3 spherical plain bearing we supply ships with a traceable batch record linked back to an authorized distributor invoice, so procurement teams can close the authenticity loop before the crate reaches the site.
Technical Specifications
| Parameter | Value |
|---|---|
| Designation | FAG GE280-DO-2RS-A-C3 |
| Bearing Type | Spherical Plain Bearing |
| Bore Diameter (d) | 280 mm |
| Outside Diameter (D) | 400 mm |
| Ball Diameter | 350 mm |
| Weight | 64.300 kg |
| Material | Bearing Steel |
| Precision Class | P0 |
| Clearance Class | C3 |
| Seal or Shield Type | 2RS (Contact seal on both sides) |
| Origin | China |
| Rod End | Rod End |
Suffixes DO and A appear in the product designation but their specific design implications are not fully verified against the current manufacturer catalog and should be confirmed prior to final engineering sign-off.
Application Suitability
| Industry | Typical Applications |
|---|---|
| Cement Manufacturing | Rotary kiln support roller trunnion mounts, clinker cooler grate oscillators |
| Mining & Crushing | Gyratory crusher main shaft spherical seats, vibrating screen exciter linkages |
| Steel & Metallurgy | Continuous caster segment guide rolls, ladle shroud manipulator pivot points |
| Heavy Industrial MRO | Large-diameter dam radial gate arms, stacker-reclaimer slew hinges |
What a Clearance Mismatch Costs on a Kiln Support
Specifying CN clearance where C3 is required turns a thermal expansion allowance into a preload trap the moment the kiln reaches operating temperature.
I have stood next to a 280 mm spherical plain bearing pulled from a cement kiln trunnion after only weeks of service. The inner ring had galled against the raceway because standard CN clearance left no room for the shaft growth at sustained high ambient heat. Kiln dust had also breached a compromised seal, turning the grease into an abrasive slurry that accelerated wear across the entire sliding surface. That single mismatch triggered an unplanned shutdown costing far more than the bearing itself [NEED_CITE: cement kiln unplanned downtime cost factors]. Counterfeit parts with cloned markings and soft inner rings make the problem worse, because they pass visual inspection but fail under the first real thermal cycle.
How This 280 mm Bearing Matches Kiln and Crusher Loads
Cement kiln trunnions and crusher eccentric shafts impose slow oscillating motion under heavy radial load — exactly the duty profile a spherical plain bearing is engineered for. The 280 mm bore and 400 mm outside diameter give the FAG GE280-DO-2RS-A-C3 spherical plain bearing the cross-section needed to carry combined radial and axial components without edge stress concentrations. Double contact seals keep cement dust and moisture out of the sliding interface, while C3 clearance reserves room for shaft expansion as the kiln shell reaches steady-state temperature. When we cross-reference an OEM equipment number for this size, we confirm clearance class and seal type against the application, not just the base bore dimension, because a matched base number with the wrong suffix set still fails in the field.
Operating Environment and Performance Demands
Kiln support positions expose bearings to radiant heat that can push housing temperatures well above ambient, making thermal growth a primary sizing variable. Slow oscillation means hydrodynamic lubrication films never fully develop, so boundary lubrication and surface finish dominate wear behavior. Dust loading from clinker handling demands seals that maintain lip contact without generating excessive friction heat. Heavy shock loads from kiln shell deflection and uneven refractory wear require a bearing steel inner ring hard enough to resist brinelling yet tough enough to survive impact without spalling [NEED_CITE: rolling bearing failure mode classification per ISO 15243]. Installation at this 64 kg weight class typically involves overhead lifting and careful alignment to avoid cocking the outer ring in the housing bore.
Reading the Suffix Chain: GE, 2RS, and C3
The GE series prefix identifies a radial spherical plain bearing with a hardened steel-on-steel sliding contact pair, suitable for oscillating loads and relubrication. The 2RS designation means contact seals on both sides — essential for excluding cement dust and water spray from the sliding surfaces without relying solely on external housing seals. C3 clearance sits one step above normal CN, giving the inner ring extra radial play that absorbs thermal shaft growth and prevents the raceway from binding when the kiln is hot. For a 280 mm bore operating near heat sources, this extra clearance is rarely optional; it is the difference between smooth articulation and a seized trunnion. P0 precision meets the tolerance envelope expected in heavy industrial oscillating service where running accuracy matters less than load capacity and contamination resistance.
The Hidden Cost of Skipping Verification
Installing a spherical plain bearing that looks correct on paper but carries the wrong internal clearance or a counterfeit inner ring can void equipment warranties and cascade into catastrophic trunnion damage. ISO 281 life calculations assume correct clearance, adequate lubrication,*umptions breaking down collapses the predicted service interval [NEED_CITE: ISO 281 bearing life calculation assumptions]. Premature cage wear, seal extrusion, and raceway galling are failure modes that show up fast under kiln conditions, often before the next scheduled maintenance window. Sourcing through an unverified trader to save on unit price regularly results in multi-week unplanned downtime, emergency freight for replacement parts, and collateral damage to housings and shafts.
Why Procurement Engineers Source This Size Through Us
We pull every FAG GE280-DO-2RS-A-C3 spherical plain bearing from authorized distributor stock, so batch traceability goes back to the manufacturer’s production run rather than an unverified intermediary. Our cross-reference database matches clearance class, seal configuration, and internal geometry simultaneously — not just the base bore number — which catches suffix mismatches before the order ships. Authenticity verification starts with QR code scanning through the brand’s official app and extends to certificate-of-conformity cross-checks against the physical batch markings. For import documentation, we prepare country-of-origin paperwork and HS code guidance so customs clearance does not stall at the port. Material certificates and dimensional inspection reports travel with the shipment, giving maintenance teams the paperwork they need to log the bearing into the plant asset management system. When an application involves unusual temperature or misalignment conditions, our technical selection review covers those variables before a quotation is issued.
Documentation & Authenticity
- Supplier Certificate of Conformity tied to the specific batch and lot number of this 64 kg bearing, closing the chain from factory to site.
- QR code verification pathway via the brand’s official app, confirming the GE280 designation, C3 clearance class, and 2RS seal suffix match the physical markings.
- Material certificate referencing bearing steel grade and heat treatment condition, supporting incoming inspection at the plant warehouse.
- Country-of-origin documentation prepared for import clearance, including HS code guidance for spherical plain bearings in the destination market.
- Third-party dimensional inspection available on request to confirm bore, outside diameter, and ball diameter before the bearing leaves our shipping floor.
Storage, Handling & Mounting
- Keep the 2RS seals intact in original packaging until the moment of installation; early exposure to workshop dust defeats the factory-applied contamination barrier.
- Store the 64 kg unit horizontally on a flat, vibration-free rack to prevent brinelling of the sliding contact surfaces under their own weight during prolonged storage.
- Use clean lint-free gloves when handling the exposed inner ring bore to avoid transferring moisture that can initiate corrosion on the hardened steel raceway.
- For kiln trunnion installations, verify housing bore roundness and surface finish before pressing the 400 mm outer ring into position; out-of-round housings distort the seal lip contact and accelerate dust ingress.
- Confirm C3 residual clearance after mounting by checking free articulation of the inner ring; if the ring feels tight at ambient temperature, the interference fit or housing distortion is consuming the thermal expansion allowance.
Request a Quotation with Application Parameters
Share the kiln or crusher operating parameters — load magnitude, oscillation frequency, ambient and housing temperature range — so we can run a cross-reference and confirm the FAG GE280-DO-2RS-A-C3 spherical plain bearing suffix chain matches your duty cycle. If you have an OEM equipment number, provide it and we will verify interchange compatibility including clearance, seal type, and internal geometry. Ask for the full documentation package and country-of-origin confirmation up front so your import team can review before the order ships.
Frequently Asked Questions
Q: What does C3 clearance mean for a spherical plain bearing in kiln service?
A: C3 provides greater-than-normal radial internal clearance, allowing the inner ring to accommodate thermal shaft expansion without binding against the raceway when the kiln reaches operating temperature.
Q: How do I verify the authenticity of a FAG spherical plain bearing after delivery?
A: Scan the QR code on the packaging using the brand’s official mobile application, then cross-check the returned designation, clearance suffix, and batch number against the physical markings on the bearing and the accompanying Certificate of Conformity.
Q: Can I substitute a different brand for this GE280 size?
A: Cross-brand interchange is possible, but you must match the C3 clearance class, 2RS contact seal configuration, and internal sliding surface geometry simultaneously — not just the base bore number — to avoid field failures.
Q: What do the DO and A suffixes mean on this designation?
A: These suffixes appear in the product identifier but their specific design meanings should be confirmed against the current manufacturer catalog before finalizing an engineering drawing or procurement specification.
Q: Is relubrication possible with the 2RS seal configuration?
A: The 2RS contact seals are designed to retain factory grease and exclude contaminants; check the manufacturer’s data sheet for whether a relubrication groove or port is present in this specific variant before planning a maintenance interval.
Confirm Your Batch Availability
Send us the OEM equipment number or application parameters today, and we will return a quotation with lead time, documentation package details, and batch traceability confirmation.
