Manufactured by CHG Bearing, the 8578/8520D is a precision Double Row Tapered Roller Bearings. Key dimensional parameters include a 241.3 mm bore diameter, a 327.025 mm outer diameter, and a 114.3 mm overall width. This component is designed to meet standard load requirements and ensure consistent operational performance. For comprehensive technical evaluation, please explore the detailed specifications, dimensional data, product images, and CAD drawings provided below. A complete PDF data sheet is also readily available for direct download to support your engineering and procurement needs.
8578/8520D - Double Row Tapered Roller Bearings
Technical Specifications
| Overview | |
|---|---|
| Part Number | 8578/8520D |
| Brand | CHG® |
| Bearing | Double Row Tapered Roller Bearing |
| Characteristics | |
| Series | 370000 |
| Number of Rows | Double Row |
| Tolerance Class | Class 4 |
| Dimensions | |
| Bore Diameter (d) | 241.3 mm |
| Width (B) | 114.3 mm |
| Outer Diameter (D) | 327.025 mm |
| Bore Diameter Tolerance | 0 – +0.025 mm |
| Outside Diameter Tolerance | 0 – +0.051 mm |
| Inner Ring Chamfer | 3.2 mm |
| Outer Ring Chamfer | 1.6 mm |
| Inner Ring Assembly Width Tolerance | -0.508 – +0.711 mm |
| Outer Ring Assembly Width | 107.95 mm |
| Outer Ring Assembly Width Tolerance | -0.508 – +0.711 mm |
| Shaft Abutment Diameter | 267.2 mm |
| Housing Abutment Diameter | 336.7 mm |
| Lubrication Hole Diameter | 6 mm |
| Performance | |
| Basic Dynamic Load Rating C (kN) | 950 kN |
| Basic Static Load Rating C0 (kN) | 2050 kN |
| Material | |
| Mass (kg) | 34 kg |
| Ring Material | Bearing Steel |
| Cage Material | 08Al Steel / Grade 10 Steel |
| Lubrication Groove Width | 12 mm |
| Roller Material | Bearing Steel |
8578/8520D 327.025 mm 241.3 mm 114.3 mm Frequently Asked Questions about 8578/8520D Double Row Tapered Roller Bearings
Find key technical answers regarding dimensions, specifications, and replacement options for this model.
The Open Type engineered for 8578/8520D by CHG Bearing utilizes precision non-contact metal shields or reinforced NBR/FKM contact lip seals. This barrier prevents particulate ingress, washdown fluids, and abrasive dust from reaching the raceways while eliminating grease leakage under centrifugal forces.
As standard production, CHG Bearing subjects 8578/8520D to precision bainite or martensite quenching, offering dimensional stability up to 120°C (248°F). For high-heat processing equipment, CHG Bearing also supplies custom S0 (150°C), S1 (200°C), or S2 (250°C) stabilization heat treatments upon request to prevent residual austenite transformation.
To safeguard CHG Bearing 8578/8520D against fretting wear and false brinelling during transport or vibration, assemble mating surfaces (241.3 mm x 327.025 mm) using anti-fretting mounting paste. Maintaining strict alignment and avoiding prolonged static vibration will preserve raceway polish.
Engineered according to international ISO boundary plans, CHG Bearing supplies 8578/8520D with a precision bore diameter (d) of 241.3 mm, an outside diameter (D) of 327.025 mm, and a nominal ring width (B) of 114.3 mm. This configuration yields an effective cross-sectional wall thickness of 42.9 mm and an envelope ratio (D/d) of 1.36, delivering compact rigidity for OEM machinery housings.
