Product details
Description and application notes
Mixed-Brand Sourcing — Consolidate this FAG unit with other premium makes in a single shipment to simplify your MRO procurement.
Technical Specifications
| Parameter | Value |
|---|---|
| Designation | FAG 3206-Bd-XL-2z-Tvh-C3 |
| Bearing Type | Double Row Angular Contact Ball Bearing |
| Bore Diameter (d) | 30 mm |
| Outside Diameter (D) | 62 mm |
| Width (B) | 23.8 mm |
| Contact Angle | α=30° (Bd Type) |
| Cage Material | Polyamide (Tvh) |
| Seal or Shield Type | Double steel shields (2z) |
| Clearance Class | C3 radial internal clearance |
| Precision Class | P0 / P6 / P5 |
| Material | Bearing steel (stainless variants available) |
| Certification | ISO 15:2017, DIN 628-3 |
| Origin | Jiangsu China |
Note: The "XL" suffix remains unverified and requires manufacturer catalog confirmation for specific performance claims.
Application Suitability
| Industry | Typical Applications |
|---|---|
| Engineering Machinery | Crane slewing mechanisms and articulation joints |
| Heavy-Duty Equipment | Excavator hydraulic pump drives |
| Industrial Gearboxes | High-load helical gear shaft supports |
| Pumps | Centrifugal pump impeller shaft positioning |
Why Dust Ingress and Thermal Expansion Destroy Slewing Bearings
Proper suffix selection prevents catastrophic raceway scoring in harsh environments.
I spent years running after-sales support on construction sites in Riyadh, where I saw firsthand what happens when procurement teams ignore suffix details. A crane slewing ring seized prematurely because the buyer specified a basic model without considering that standard seals cannot block fine desert sand, nor did they account for thermal expansion causing raceway scoring under extreme heat. Specifying the exact FAG 3206-Bd-XL-2z-Tvh-C3 double row angular contact ball bearing ensures the shielding and internal clearances are correctly matched to these brutal conditions.
Matching the 30° Contact Angle to Combined Loads
The 30° contact angle inherent to the Bd designation optimizes the balance between radial and axial load capacity. When heavy equipment experiences simultaneous lifting and swinging forces, this specific geometry distributes the stress evenly across both rows of rolling elements. Our engineering team frequently cross-references these load vectors to ensure the selected bearing handles the combined forces without premature fatigue.
Navigating High Temperatures and Particulate Contamination
Desert environments introduce severe thermal cycling and abrasive dust that compromise standard bearing internals. The C3 clearance class accommodates the thermal expansion of the inner ring when operating at elevated temperatures, preventing the rolling elements from binding. Meanwhile, the double steel shields provide a non-contact barrier that keeps fine silica particles out of the raceway without generating the excessive friction heat associated with rubber lip seals.
Decoding the Polyamide Cage and Shield Configuration
The Tvh polyamide cage is engineered for smooth operation and reduced friction at higher speeds, making it ideal for dynamic machinery applications. Unlike brass cages that might struggle with lubrication starvation during rapid acceleration, this polymer design maintains a consistent oil film. The 2z shielding configuration is crucial here; it retains the factory grease while blocking external debris, which is vital since this bearing type is typically sealed for life and cannot be easily relubricated in the field.
The Hidden Costs of Ignoring Suffix Interactions
Overlooking the interplay between cage material, clearance, and shielding leads to unplanned downtime and catastrophic damage to surrounding housings. When a bearing operates with standard CN clearance in a high-heat environment, the internal preload spikes, accelerating fatigue and potentially seizing the shaft. Adhering to ISO 281 life calculation frameworks requires accurate input of these exact suffix parameters to avoid voiding equipment warranties and facing massive replacement costs.
Securing Traceable Inventory for Critical Replacements
Sourcing authentic components with complete traceability eliminates the risk of installing counterfeit parts in critical heavy-equipment applications. We maintain massive spot inventory covering thousands of standard and special part numbers, ensuring you get the exact FAG 3206-Bd-XL-2z-Tvh-C3 double row angular contact ball bearing without enduring typical multi-week lead times. Our technical selection support includes verifying the Bd contact angle and C3 clearance against your specific OEM requirements, preventing the costly mismatch errors I used to investigate in the field.
Documentation & Authenticity
- Certificate of Conformity confirming DIN 628-3 dimensional compliance for this 32-series bearing.
- Original batch traceability documentation linking the 2z shielded unit to the manufacturer's production facilities.
- Official app QR verification to authenticate the Tvh polyamide cage batch before installation.
- Running accuracy inspection report validating the P6 precision class for gearbox applications.
- Material test certificate verifying the bearing steel composition and heat treatment hardness.
Storage, Handling & Mounting
- Keep the 2z shielded bearing in its original vapor-proof packaging until mounting to prevent desert humidity from corroding the raceway.
- Avoid using carbon steel tools near the polyamide Tvh cage during installation to prevent static discharge or physical scoring.
- Do not wash or degrease this double shielded unit, as it is pre-lubricated for life and opening the shields destroys the seal integrity.
- Store the C3 clearance bearings away from direct sunlight to prevent UV degradation of the polyamide cage material over time.
- Use induction heaters when mounting the 30mm bore to ensure even thermal expansion without damaging the Bd contact angle geometry.
Engineering Review and Selection Guidance
To ensure this specific configuration meets your operational demands, please provide your exact radial and axial load profiles along with maximum operating temperatures. Sharing the OEM equipment serial numbers allows our team to perform a thorough cross-reference check and validate the C3 clearance necessity. This technical review guarantees the selected bearing aligns perfectly with your maintenance intervals and environmental constraints.
Frequently Asked Questions
Q: What does the "Bd" suffix indicate compared to standard contact angles?
A: The Bd suffix specifies a 30° contact angle, which differs from the standard 25° or 40° angles found in other series. This specific geometry is optimized to handle a more balanced ratio of radial and axial loads, making it highly suitable for crane slewing mechanisms where combined forces are constant.
Q: When should C3 clearance be selected over standard CN clearance?
A: C3 clearance provides greater internal space than standard CN, which is essential when the inner ring experiences significant thermal expansion or when operating in high-temperature environments. This prevents the rolling elements from binding and scoring the raceway under extreme heat conditions.
Q: How do the 2z shields affect maintenance and relubrication?
A: The 2z double steel shields are designed to retain the factory-applied high-quality grease while blocking dust ingress. Because these shields are non-removable without damaging the bearing, this unit is considered sealed for life and should not be relubricated in the field.
Q: What is the significance of the Tvh polyamide cage in heavy machinery?
A: The Tvh cage is made from glass fiber-reinforced polyamide, which offers excellent sliding properties and low friction at higher speeds. It is considerably lighter than brass alternatives, reducing centrifugal forces on the rolling elements during rapid acceleration in hydraulic pump drives.
