NSK HR30208J Tapered Roller Bearing 40x80x19.75mm Cone & Cup Set

The NSK HR30208J is a single-row tapered roller bearing featuring a precision-matched cone and cup set. Manufactured by NSK in Japan, this bearing is engineered to handle combined radial and axial (thrust) loads simultaneously, making it a reliable solution for demanding automotive, industrial, and powersports drivetrain applications.

Tapered roller bearings like the HR30208J are designed so that the apices of the cone and cup raceways and the conical rollers all converge at a single point on the bearing axis. This geometry enables efficient load distribution across a large contact area, delivering high load capacity and rigid support. Note that when radial loads are applied, an axial reaction force is generated — for this reason, the HR30208J is typically installed in opposing pairs or mirrored arrangements to properly manage thrust loads in both directions.

Key Specifications:

• Bearing Number: HR30208J
• Bore Diameter (d): 40 mm (1.575 in)
• Outer Diameter (D): 80 mm (3.150 in)
• Total Width (T): 19.75 mm (0.777 in)
• Cone Width (B): 18 mm (0.709 in)
• Cup Width (C): 16 mm (0.630 in)
• Basic Dynamic Load Rating (C): 63.5 kN
• Basic Static Load Rating (C0): 70 kN
• Grease Lubrication Speed: 4,800 RPM
• Oil Lubrication Speed: 6,300 RPM
• Weight: 0.437 kg (0.96 lbs)
• Origin: Made in Japan

The separable cup and cone design simplifies installation and removal. NSK manufactures this bearing to strict dimensional and tolerance standards, ensuring consistent performance and long service life across a wide range of applications including wheel hubs, gearboxes, differentials, and axle assemblies.