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Precision tapered roller bearing for heavy‑duty applications – The OEM 33209GB/T 297 Tapered Roller Bearing is engineered to support combined radial and thrust loads in SINOTRUK Homan axles, gearboxes, and wheel hubs. Known internationally as bearing 297, this metric size bearing provides high rigidity and long life. For guaranteed compatibility and performance, always choose genuine Sinotruk Homan parts.
The 33209GB/T bearing conforms to the international 297 size, with dimensions 45 mm inner bore, 85 mm outer diameter, and 28 mm width. It is manufactured from vacuum‑degassed 100Cr6 (AISI 52100) steel, heat‑treated to 60‑64 HRC, and precision ground to ISO 492 class P6.
The 33209GB/T bearing, known in the industry as size 297, is a single‑row tapered roller bearing that excels in applications requiring both radial and axial load support. It is widely used in heavy‑truck differentials, pinion supports, and front wheel hubs. The tapered geometry ensures that the rollers remain in pure rolling contact with the raceways, minimizing friction and wear.
The bearing is manufactured from vacuum‑degassed 100Cr6 steel, which provides exceptionally clean material with few non‑metallic inclusions. After case‑carburizing and through‑hardening, the rings and rollers achieve a uniform hardness of 60‑64 HRC. The raceways are superfinished to a mirror finish (Ra ≤ 0.1 μm), reducing friction and operating temperature. A pressed steel cage maintains proper roller spacing and guides the rollers evenly.
Compared to aftermarket substitutes, the genuine SINOTRUK Homan 33209GB/T bearing offers tighter tolerances, better surface finish, and a significantly longer L10 fatigue life – typically over 5,000 hours at rated loads. It is 100% dynamically tested for noise and vibration (SQF grade) before packaging.
Dynamic load rating (C) 78 kN, static rating (C0) 108 kN. Ideal for differentials, hubs, and gearbox shafts.
ISO 492 class P6 (P5 optional). Radial runout ≤ 0.015 mm, ensuring smooth rotation and quiet operation.
Fully interchangeable with standard 297 bearing. Direct replacement for most heavy‑truck and industrial applications.
| OEM Number | 33209GB/T |
| Industry Size | 297 (tapered roller bearing) |
| Brand | SINOTRUK Homan |
| Bore Diameter (d) | 45 mm |
| Outer Diameter (D) | 85 mm |
| Width (T – total) | 28 mm |
| Cone Width (B) | 28 mm |
| Dynamic Load Rating (C) | 78 kN (17,500 lbf) |
| Static Load Rating (C0) | 108 kN (24,300 lbf) |
| Limiting Speed (grease) | 4800 rpm |
| Material | Vacuum‑degassed 100Cr6 (AISI 52100) |
| Hardness | 60‑64 HRC (through‑hardened) |
| Cage Material | Pressed steel (stamped) or PA66 |
| Tolerance Class | ISO 492 P6 (standard) / P5 available |
| Radial Runout (max) | 0.015 mm |
| Internal Clearance | C3 (standard) |
| Applications | Differential pinion, wheel hubs, transmission shafts |
| Compatible Vehicles | SINOTRUK HOWO, A7, T7H, C7H; many industrial gearboxes |
The 33209GB/T bearing is manufactured using a multi‑step grinding process that ensures sub‑micron accuracy. The inner raceway, outer raceway, and rollers are ground to exact geometry, then honed to a superfine finish. The resulting surface roughness (Ra ≤ 0.1 μm) reduces sliding friction and allows the bearing to run cooler, even at high speeds.
The rollers are individually sorted by diameter into groups of less than 0.5 μm variation to ensure uniform load distribution. The cage is stamped from precision tooling and then heat‑treated to resist wear. Each bearing is 100% tested for radial clearance, axial play, and noise (SQF level V2 or better).
For differential and gearbox applications, this bearing is often paired with a matching bearing (e.g., 33210) to provide precise preload adjustment. The tapered design allows easy setting of end‑play or preload using shims or a slotted nut. The genuine SINOTRUK Homan bearing ensures that the preload remains stable over the bearing’s entire life.
The 100Cr6 bearing steel is vacuum‑degassed to remove oxygen and sulfur, eliminating most internal inclusions that cause spalling. After forging, the rings are case‑carburized and through‑hardened in a controlled atmosphere furnace, resulting in a uniform martensitic microstructure with less than 3% retained austenite. This ensures dimensional stability under load and excellent rolling contact fatigue resistance.
The bearing is slushed with a heavy rust‑preventive oil for storage; before installation, it should be cleaned and packed with high‑quality NLGI #2 grease or gear oil, depending on the application.
The 33209GB/T bearing is a direct replacement for the original bearing in SINOTRUK Homan axles and gearboxes. The cone and cup are matched as a set – never interchange components from different bearings. Installation requires a hydraulic press: press the cone onto the shaft, and the cup into the housing, applying force only to the interference‑fit ring. Never hammer.
For wheel hub applications, follow the axle manufacturer’s preload specification. Typically, tighten the spindle nut to a high torque (200 Nm) while rotating, then back off and retorque to a lower value (30‑50 Nm) plus a 45‑60° angle. Measure rotational torque at the hub flange to confirm preload.
1) Clean the shaft and housing bore thoroughly; remove any burrs or old sealant. 2) Press the new bearing cone onto the shaft using a press sleeve that contacts the inner ring face only. 3) Press the cup into the housing, again using a sleeve on the outer ring face.
4) Apply a thin coat of grease to the roller ends and raceways. 5) Assemble the shaft/hub into the housing, then adjust preload using shims or a locking nut. Measure the rotating torque with a spring gauge.
6) Install a new seal or O‑ring, fill with lubricant, and run the assembly at low speed to check for noise. 7) Verify that the bearing temperature does not exceed 80°C after one hour of operation.
The 33209GB/T bearing is maintenance‑free if properly installed and lubricated. Inspect for excessive end‑play or noise every 50,000 km. White metal debris on a magnetic drain plug indicates bearing spalling; replace the bearing immediately.
Common failure causes: over‑preloading (overheating), under‑preloading (looseness and shock loading), water ingress (rusted raceways), or contamination (pitted rollers). Always replace both cup and cone as a set, and replace the seal at the same time.
Do not reuse a bearing that has been removed – the rollers and raceways will have taken a permanent set and will fail prematurely.
The 33209GB/T bearing is manufactured under IATF 16949 and ISO 9001:2015 quality systems. Each bearing is 100% inspected for dimensions (CMM), radial runout, and noise (SQF). Random samples undergo endurance life testing (L10 life > 5000 hours at rated load), debris testing (500 hours with contaminated oil), and corrosion testing (240h salt spray).
The bearing meets or exceeds ISO 355 (metric tapered roller bearing dimensions) and ISO 492 (tolerances). A laser‑etched batch code on the outer ring provides full traceability. Counterfeit bearings often have incorrect dimensions, poor surface finish, or no brand marking. Always purchase from authorized SINOTRUK Homan distributors and verify the QR code on the packaging.
A fleet of 400 SINOTRUK HOWO dump trucks in South Africa (severe dust and rough roads) replaced pinion bearings with the 33209GB/T. Over 2 years, differential failures dropped by 70%, and the bearings still showed no measurable wear after 200,000 km. The owner reported a 50% reduction in unscheduled drivetrain maintenance.
Another user – a European gearbox remanufacturer – reported that genuine bearings lasted an average of 2x longer than second‑tier brands in endurance dyno testing, with lower noise and vibration. The company switched exclusively to SINOTRUK Homan bearings for all rebuilds.
Each genuine 33209GB/T bearing is packed in a sealed plastic bag with a desiccant, then placed in a heavy‑duty carton with foam inserts. The box includes a QR code and a holographic seal. The bearing itself has the SINOTRUK Homan logo and the size etched on the outer ring.
Counterfeit bearings often have a poor surface finish, mismatched cone/cup numbers, or a rusty appearance. The genuine bearing rotates silently with a smooth, consistent drag. Always scan the QR code to verify authenticity on the SINOTRUK Homan portal. Using a fake bearing can lead to catastrophic drivetrain failure and void the vehicle warranty.
Summary: The SINOTRUK Homan 297 Tapered Roller Bearing (OEM 33209GB/T) delivers high load capacity, precision tolerances, and long service life for heavy‑duty axles and transmissions. Ensure reliable drivetrain performance – choose this genuine component trusted by fleets and mechanics worldwide.
If you have any questions about our products, services, or anything related to what we offer, please don’t hesitate to leave us a message—our dedicated team is always ready to provide prompt and helpful responses to address your concerns. What’s more, when you become our valued customer, we’re delighted to offer you complimentary catalog services, giving you access to detailed, up-to-date information on our full range of products, specifications, and offerings to help you make informed decisions.
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