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Double Row Super-Precision Cylindrical Roller Bearings NNU 4944 B/SPW33

Double Row Super-Precision Cylindrical Roller Bearings NNU 4944 B/SPW33

The NNU 4944 B/SPW33 is a double-row cylindrical roller bearing with a 220mm bore and 300mm outer diameter, built from sturdy chrome steel. It handles combined loads up to 115200 lbf and runs smoothly at speeds up to 3000 RPM.

Its open design allows for easy lubrication with grease or oil, while the double-row construction provides extra stability. The bearing operates well in temperatures from -30°C to 110°C.

This model is interchangeable with SKF bearings, making it a practical choice for replacements. Ideal for heavy machinery or industrial equipment where high radial loads are common.

Weighing 16.5kg, it’s robust yet manageable for its size. Compliant with RoHS and REACH standards for safe use.

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Product Parameters

  • Part Number NNU 4944 B/SPW33
  • Size 220 mm x 300 mm x 80 mm
  • Brand TFL
  • Interchangeable brand SKF
  • System of Measurement Metric
  • Roller Bearing Type Cylindrical
  • Bore Type Cylindrical
  • For Load Direction Combined
  • Construction Double Row
  • Seal Type Open
  • Bore Dia 220 mm
  • Bore Dia Tolerance -0.015mm to 0
  • Outer Dia 300 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.) 2.1 mm
  • Permissible Axial Displacement(max.) 3.7 mm
  • Ring Material Chrome Steel
  • Roller Material Chrome Steel
  • Dynamic Radial Load 115200 lbf
  • Static Radial Load 256500 lbf
  • Max Speed 3000 rpm
  • Lubrication Grease, Oil
  • Temperature Range -30° to 110 °C
  • RoHS Compliant
  • REACH Compliant
  • Weight 16.5 kg
  • Width Annular Lubrication Groove Outer Ring(B1) 11.1 mm
  • Diameter Lubrication Hole (outer Ring) (K) 3 mm
  • Shoulder Dia Outer Ring 272.2 mm
  • Raceway Diameter Inner Ring 245 mm
Double Row Super-Precision Cylindrical Roller Bearings NNU 4944 B/SPW33 dimension drawing
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Features

Performance Features of NNU 4944 B/SPW33 Bearing

NNU 4944 B/SPW33 Bearing is built with chrome steel rings and rollers, offering high resistance to combined loads.
Its dynamic radial load capacity reaches 115200 lbf, making it suitable for heavy-duty applications.

The double-row design enhances stability and load distribution, ensuring smooth operation.
With a maximum speed of 3000 rpm, it balances performance and durability.

NNU 4944 B/SPW33 Bearing works well in temperatures ranging from -30° to 110°C.
Its open design allows for easy lubrication with grease or oil, reducing maintenance needs.

The precise chamfer dimensions and lubrication grooves improve efficiency and longevity.
This bearing is ideal for applications requiring high precision and reliability.

Application

Industrial Uses of NNU 4944 B/SPW33 Bearing
NNU 4944 B/SPW33 Bearing is commonly used in heavy industrial machinery, such as large lathes and rolling mills, where its double-row design handles combined radial and axial loads efficiently. The open seal type allows for easy lubrication, ensuring long service life in demanding conditions.

What Makes NNU 4944 B/SPW33 Bearing a Preferred Choice?
In wind turbine gearboxes, NNU 4944 B/SPW33 Bearing’s high dynamic radial load capacity ensures reliable performance under fluctuating forces. Its chrome steel construction also resists wear, making it suitable for continuous operation.

Built for Heavy-Duty Use: NNU 4944 B/SPW33 Bearing
For paper manufacturing equipment, NNU 4944 B/SPW33 Bearing’s precision cylindrical rollers provide smooth rotation under high loads. The wide temperature range (-30° to 110°C) ensures stability in various production environments.

Automotive vs Aerospace: Applications of NNU 4944 B/SPW33 Bearing
In automotive applications, NNU 4944 B/SPW33 Bearing supports large drivetrain components, while in aerospace, its high-speed capability (up to 3000 rpm) makes it ideal for rotor assemblies. The metric sizing ensures compatibility across industries.

Key Fields for NNU 4944 B/SPW33 Bearing
NNU 4944 B/SPW33 Bearing is often found in mining equipment, where its static radial load capacity (256500 lbf) handles extreme pressures. The grease or oil lubrication options adapt to different maintenance schedules.

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