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

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

The NNU 4944 BK/SPW33 is a double-row cylindrical roller bearing with a 220mm tapered bore and 300mm outer diameter, built for combined loads. It handles radial loads up to 115200 lbf and spins smoothly at speeds up to 3000 RPM.

Made from durable chrome steel, its open design allows easy lubrication with grease or oil. The bearing operates well in temperatures from -30°C to 110°C, making it suitable for various industrial conditions.

Its double-row construction provides stability, while the tapered bore ensures secure fitting. The bearing is interchangeable with SKF models, offering a reliable replacement option.

Ideal for heavy machinery, gearboxes, or applications requiring high precision and load capacity. Compliant with RoHS and REACH standards, it weighs 16.5kg for its robust size.

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Product Parameters

  • Part Number NNU 4944 BK/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 Taper 1:12
  • For Load Direction Combined
  • Construction Double Row
  • Seal Type Open
  • Bore Dia 220 mm
  • Bore Dia Tolerance 0 to +0.030mm
  • 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.) 1.1 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 BK/SPW33 dimension drawing
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Features

Performance Features of NNU 4944 BK/SPW33 Bearing

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

The tapered bore design simplifies installation, saving time and effort.
Precision engineering ensures reliable performance in demanding conditions.

Application

Industrial Uses of NNU 4944 BK/SPW33 Bearing
NNU 4944 BK/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 BK/SPW33 Bearing a Preferred Choice?
In high-speed applications like turbine drives, NNU 4944 BK/SPW33 Bearing’s precision construction minimizes friction and heat buildup. Its chrome steel rollers and rings provide excellent durability, even under continuous operation.

Perfect Fit for Automation: NNU 4944 BK/SPW33 Bearing
NNU 4944 BK/SPW33 Bearing works well in robotic arms and automated production lines, where its tapered bore ensures secure mounting. The generous axial displacement tolerance accommodates slight misalignments without compromising performance.

Automotive vs Aerospace: Applications of NNU 4944 BK/SPW33 Bearing
In automotive gearboxes, NNU 4944 BK/SPW33 Bearing supports high torque transmission, while in aerospace, its precision suits helicopter rotor systems. The metric sizing ensures compatibility with international standards.

Where Is NNU 4944 BK/SPW33 Bearing Used?
NNU 4944 BK/SPW33 Bearing can be found in medical imaging devices, where its smooth rotation is vital for accurate diagnostics. The grease or oil lubrication options make it adaptable to different operational needs.

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