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Double Row Super-Precision Cylindrical Roller Bearings NNU 4940 BK/SPW33

Double Row Super-Precision Cylindrical Roller Bearings NNU 4940 BK/SPW33

The NNU 4940 BK/SPW33 is a double-row cylindrical roller bearing with a 200mm tapered bore and 280mm outer diameter, built for combined loads. It handles dynamic radial loads up to 108900 lbf and operates smoothly at speeds up to 3000 RPM.

Made from durable chrome steel, its open design allows easy lubrication with grease or oil. The bearing can withstand temperatures from -30°C to 110°C, making it suitable for demanding environments.

With a weight of 15kg, it’s robust yet manageable for industrial use. Compliant with RoHS and REACH standards, it’s a reliable choice for heavy machinery and precision equipment.

Ideal for applications like machine tools or gearboxes where high radial loads and precision are required. Its interchangeable design with SKF bearings ensures easy replacements.

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Product Parameters

  • Part Number NNU 4940 BK/SPW33
  • Size 200 mm x 280 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 200 mm
  • Bore Dia Tolerance 0 to +0.030mm
  • Outer Dia 280 mm
  • Outer Dia Tolerance -0.018mm 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 108900 lbf
  • Static Radial Load 234000 lbf
  • Max Speed 3000 rpm
  • Lubrication Grease, Oil
  • Temperature Range -30° to 110 °C
  • RoHS Compliant
  • REACH Compliant
  • Weight 15 kg
  • Width Annular Lubrication Groove Outer Ring(B1) 11.1 mm
  • Diameter Lubrication Hole (outer Ring) (K) 3 mm
  • Shoulder Dia Outer Ring 252.2 mm
  • Raceway Diameter Inner Ring 225 mm
Double Row Super-Precision Cylindrical Roller Bearings NNU 4940 BK/SPW33 dimension drawing
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Features

Performance Features of NNU 4940 BK/SPW33 Bearing

NNU 4940 BK/SPW33 Bearing is built with chrome steel rings and rollers, offering strong resistance to combined loads.
Its dynamic radial load capacity reaches 108900 lbf, ensuring reliable performance in demanding conditions.

The double-row cylindrical design enhances stability, making it suitable for high-precision applications.
With a maximum speed of 3000 rpm, it balances durability and efficiency.

NNU 4940 BK/SPW33 Bearing operates smoothly in temperatures ranging from -30° to 110°C.
Its open design allows for easy lubrication with grease or oil, reducing maintenance needs.

The tapered bore design ensures secure fitting, minimising slippage during operation.
This bearing is ideal for applications requiring both radial and axial load support.

Application

Industrial Uses of NNU 4940 BK/SPW33 Bearing
NNU 4940 BK/SPW33 Bearing is commonly used in heavy industrial machinery, such as large lathes and rolling mills, where its double-row design handles combined loads efficiently. The tapered bore ensures a secure fit, reducing slippage during high-speed operations.

What Makes NNU 4940 BK/SPW33 Bearing a Preferred Choice?
In precision applications like gearboxes and spindles, NNU 4940 BK/SPW33 Bearing offers excellent radial load capacity and stability. Its chrome steel construction provides durability, even in demanding environments.

Built for Heavy-Duty Use: NNU 4940 BK/SPW33 Bearing
NNU 4940 BK/SPW33 Bearing excels in applications like wind turbines and mining equipment, where its high dynamic radial load rating ensures reliable performance. The open design allows for easy lubrication, extending service life.

Automotive vs Aerospace: Applications of NNU 4940 BK/SPW33 Bearing
In automotive systems, NNU 4940 BK/SPW33 Bearing supports components like drivetrains, while in aerospace, it’s used in landing gear assemblies. Its metric sizing and grease compatibility make it versatile across industries.

Key Fields for NNU 4940 BK/SPW33 Bearing
NNU 4940 BK/SPW33 Bearing is ideal for machine tools and industrial robots, where precision and load capacity are critical. The wide temperature range ensures performance in both hot and cold operating conditions.

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