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Double Row Super-Precision Cylindrical Roller Bearings NNU 4948 BK/SPW33

Double Row Super-Precision Cylindrical Roller Bearings NNU 4948 BK/SPW33

The NNU 4948 BK/SPW33 is a double-row cylindrical roller bearing with a 240mm tapered bore and 320mm outer diameter, built for combined loads. It handles dynamic radial loads up to 118800 lbf and operates smoothly at speeds up to 3000 RPM.

Made from durable chrome steel, its open design allows flexible lubrication with grease or oil. The double-row construction provides stability, while the tapered bore ensures secure fitting.

This bearing suits heavy-duty applications like industrial gearboxes or machine tools where precision and load capacity are key. It works in temperatures from -30°C to 110°C and is interchangeable with SKF models.

Weighing 17.5kg, it’s robust yet designed for efficient performance. Compliant with RoHS and REACH standards, it’s a reliable choice for demanding environments.

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Product Parameters

  • Part Number NNU 4948 BK/SPW33
  • Size 240 mm x 320 mm x 80 mm
  • Brand TFL
  • Interchangeable brand SKF
  • System of Measurement Metric
  • Roller Bearing Type Cylindrical
  • Bore Type Taper 1:12
  • For Load Direction Combined
  • Construction Double Row
  • Seal Type Open
  • Bore Dia 240 mm
  • Bore Dia Tolerance 0 to +0.030mm
  • Outer Dia 320 mm
  • Outer Dia Tolerance -0.020mm to 0
  • Width 80 mm
  • Width Tolerance -0.30mm to 0
  • Chamfer Dimension Outer Ring(r1,2)(min.) 2.1 mm
  • Chamfer Dimension Inner Ring(r3,4)(min.) 1.1 mm
  • Permissible Axial Displacement(max.) 3.7 mm
  • Ring Material Chrome Steel
  • Roller Material Chrome Steel
  • Dynamic Radial Load 118800 lbf
  • Static Radial Load 274500 lbf
  • Max Speed 3000 rpm
  • Lubrication Grease, Oil
  • Temperature Range -30° to 110 °C
  • RoHS Compliant
  • REACH Compliant
  • Weight 17.5 kg
  • Width Annular Lubrication Groove Outer Ring(B1) 11.1 mm
  • Diameter Lubrication Hole (outer Ring) (K) 3 mm
  • Shoulder Dia Outer Ring 292.2 mm
  • Raceway Diameter Inner Ring 265 mm
Double Row Super-Precision Cylindrical Roller Bearings NNU 4948 BK/SPW33 dimension drawing
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Features

Performance Features of NNU 4948 BK/SPW33 Bearing

NNU 4948 BK/SPW33 Bearing is built with chrome steel rings and rollers, offering strong resistance to combined loads.
Its dynamic radial load capacity reaches 118,800 lbf, ensuring reliable performance in demanding applications.

The double-row cylindrical design enhances stability and load distribution, reducing wear and extending service life.
With a maximum speed of 3,000 rpm, it balances durability and efficiency in high-speed operations.

NNU 4948 BK/SPW33 Bearing operates smoothly in temperatures ranging from -30° to 110°C, adapting to various environments.
Its open design allows for flexible lubrication options, either grease or oil, to suit different needs.

The tapered bore design ensures secure fitting, minimising slippage and enhancing overall reliability.
Precision engineering guarantees consistent performance, making it a dependable choice for industrial applications.

Application

Industrial Uses of NNU 4948 BK/SPW33 Bearing
NNU 4948 BK/SPW33 Bearing is commonly used in heavy machinery like industrial gearboxes and large pumps, where its double-row design handles combined loads efficiently. The chrome steel construction ensures durability even in demanding environments.

What Makes NNU 4948 BK/SPW33 Bearing a Preferred Choice?
In wind turbines, NNU 4948 BK/SPW33 Bearing excels due to its high radial load capacity and tolerance for axial displacement. Its open design allows for easy lubrication, extending service life in remote installations.

Built for Heavy-Duty Use: NNU 4948 BK/SPW33 Bearing
NNU 4948 BK/SPW33 Bearing is ideal for rolling mills, where precision and strength are critical. The tapered bore ensures a secure fit, reducing slippage during high-speed operations.

Automotive vs Aerospace: Applications of NNU 4948 BK/SPW33 Bearing
In automotive applications, NNU 4948 BK/SPW33 Bearing supports large drivetrain components, while in aerospace, it’s used in landing gear systems. Its grease and oil lubrication options provide flexibility for different operating conditions.

Where Is NNU 4948 BK/SPW33 Bearing Used?
NNU 4948 BK/SPW33 Bearing is found in machine tools, where its super-precision design ensures smooth, accurate rotations. The wide temperature range makes it suitable for both hot and cold working environments.

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