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Double Row Super-Precision Cylindrical Roller Bearings NNU 4928 BK/SPW33

Double Row Super-Precision Cylindrical Roller Bearings NNU 4928 BK/SPW33

The NNU 4928 BK/SPW33 is a double-row cylindrical roller bearing with a 140mm bore and 190mm outer diameter, crafted from sturdy chrome steel. It handles combined loads up to 42750 lbf and runs smoothly at speeds up to 5000 RPM.

Its open design allows easy lubrication with grease or oil, while the tapered bore ensures a secure fit. The bearing operates well in temperatures from -30°C to 110°C.

This model is interchangeable with SKF bearings, making it a reliable choice for replacements. Ideal for precision machinery like gearboxes or spindles where high radial loads are common.

Weighing 4.1kg, 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 4928 BK/SPW33
  • Size 140 mm x 190 mm x 50 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 140 mm
  • Bore Dia Tolerance 0 to +0.025mm
  • Outer Dia 190 mm
  • Outer Dia Tolerance -0.015mm to 0
  • Width 50 mm
  • Width Tolerance -0.25mm to 0
  • Chamfer Dimension Outer Ring(r1,2)(min.) 1.5 mm
  • Chamfer Dimension Inner Ring(r3,4)(min.) 1 mm
  • Permissible Axial Displacement(max.) 2.2 mm
  • Ring Material Chrome Steel
  • Roller Material Chrome Steel
  • Dynamic Radial Load 42750 lbf
  • Static Radial Load 90000 lbf
  • Max Speed 5000 rpm
  • Lubrication Grease, Oil
  • Temperature Range -30° to 110 °C
  • RoHS Compliant
  • REACH Compliant
  • Weight 4.1 kg
  • Width Annular Lubrication Groove Outer Ring(B1) 5.5 mm
  • Diameter Lubrication Hole (outer Ring) (K) 3 mm
  • Shoulder Dia Outer Ring 172 mm
  • Raceway Diameter Inner Ring 156 mm
Double Row Super-Precision Cylindrical Roller Bearings NNU 4928 BK/SPW33 dimension drawing
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Features

Performance Features of NNU 4928 BK/SPW33 Bearing

NNU 4928 BK/SPW33 Bearing is built with chrome steel rings and rollers, offering strong resistance to combined loads.
Its dynamic radial load capacity reaches 42750 lbf, ensuring reliable performance in demanding conditions.

The double-row cylindrical design enhances stability and load distribution, reducing wear over time.
With a maximum speed of 5000 rpm, it balances precision and durability for high-performance applications.

NNU 4928 BK/SPW33 Bearing operates efficiently in temperatures ranging from -30° to 110°C.
Its open design allows for flexible lubrication options, including grease or oil, to suit various operational needs.

The tapered bore design simplifies installation and ensures secure fitting.
This feature, combined with precise tolerances, enhances the bearing’s overall reliability and service life.

Application

Industrial Uses of NNU 4928 BK/SPW33 Bearing
NNU 4928 BK/SPW33 Bearing is commonly used in heavy industrial machinery, such as large lathes and milling machines, where its double-row design handles both radial and axial loads efficiently. The tapered bore ensures a secure fit, reducing slippage during high-speed operations.

What Makes NNU 4928 BK/SPW33 Bearing a Preferred Choice?
In wind turbine gearboxes, NNU 4928 BK/SPW33 Bearing’s high dynamic radial load capacity ensures reliable performance under fluctuating forces. Its open design allows for easy lubrication, extending service life in harsh environments.

Built for Heavy-Duty Use: NNU 4928 BK/SPW33 Bearing
For steel rolling mills, NNU 4928 BK/SPW33 Bearing’s chrome steel construction withstands extreme pressures and temperatures. The precise tolerances and grease lubrication options make it suitable for continuous operation.

Automotive vs Aerospace: Applications of NNU 4928 BK/SPW33 Bearing
In automotive drivetrains, NNU 4928 BK/SPW33 Bearing supports high torque loads, while in aerospace, its lightweight yet robust design is ideal for landing gear systems. The metric sizing ensures compatibility across global standards.

Where Is NNU 4928 BK/SPW33 Bearing Used?
NNU 4928 BK/SPW33 Bearing is often found in paper manufacturing equipment, where its ability to handle combined loads keeps production lines running smoothly. The high static radial load capacity also makes it a dependable choice for heavy presses.

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