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Double Row Super-Precision Cylindrical Roller Bearings NNU 4921 B/SPW33

Double Row Super-Precision Cylindrical Roller Bearings NNU 4921 B/SPW33

The NNU 4921 B/SPW33 is a double-row cylindrical roller bearing with a 105mm bore and 145mm outer diameter, crafted from durable chrome steel. It handles combined loads up to 29250 lbf and operates smoothly at speeds up to 6000 RPM.

Its open design allows for easy lubrication with grease or oil, while the double-row construction provides added stability under heavy loads. The bearing performs reliably in temperatures ranging from -30°C to 110°C.

This model is interchangeable with SKF bearings, making it a practical choice for replacements. Ideal for precision applications like machine tools or industrial gearboxes where high radial loads are common.

Weighing 2kg, it’s robust yet manageable for its size. Compliant with RoHS and REACH standards, it’s a safe and dependable option for various industrial uses.

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Product Parameters

  • Part Number NNU 4921 B/SPW33
  • Size 105 mm x 145 mm x 40 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 105 mm
  • Bore Dia Tolerance -0.010mm to 0
  • Outer Dia 145 mm
  • Outer Dia Tolerance -0.011mm to 0
  • Width 40 mm
  • Width Tolerance -0.20mm to 0
  • Chamfer Dimension Outer Ring(r1,2)(min.) 1.1 mm
  • Chamfer Dimension Inner Ring(r3,4)(min.) 1.1 mm
  • Permissible Axial Displacement(max.) 1.1 mm
  • Ring Material Chrome Steel
  • Roller Material Chrome Steel
  • Dynamic Radial Load 29250 lbf
  • Static Radial Load 58500 lbf
  • Max Speed 6000 rpm
  • Lubrication Grease, Oil
  • Temperature Range -30° to 110 °C
  • RoHS Compliant
  • REACH Compliant
  • Weight 2 kg
  • Width Annular Lubrication Groove Outer Ring(B1) 5.5 mm
  • Diameter Lubrication Hole (outer Ring) (K) 3 mm
  • Shoulder Dia Outer Ring 130.8 mm
  • Raceway Diameter Inner Ring 118 mm
Double Row Super-Precision Cylindrical Roller Bearings NNU 4921 B/SPW33 dimension drawing
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Features

Performance Features of NNU 4921 B/SPW33 Bearing

NNU 4921 B/SPW33 Bearing is built with chrome steel rings and rollers, offering strong resistance to combined loads.
Its dynamic radial load capacity reaches 29,250 lbf, ensuring reliable performance in demanding applications.

The double-row cylindrical design enhances stability and load distribution, reducing wear over time.
With a maximum speed of 6,000 rpm, it balances durability and efficiency for precision tasks.

NNU 4921 B/SPW33 Bearing operates smoothly in temperatures 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 precise tolerances and chamfered edges ensure easy installation and long service life.
This makes NNU 4921 B/SPW33 Bearing a practical choice for high-performance machinery.

Application

Industrial Uses of NNU 4921 B/SPW33 Bearing
NNU 4921 B/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 open seal type allows for easy lubrication, ensuring long service life in demanding conditions.

In automotive applications, NNU 4921 B/SPW33 Bearing is ideal for high-performance gearboxes and drivetrains, providing stability under combined loads. Its chrome steel construction offers durability, making it suitable for both passenger and commercial vehicles.

For automation systems, NNU 4921 B/SPW33 Bearing supports robotic arms and precision equipment, where its high-speed capability and low friction are key. The metric dimensions ensure compatibility with a wide range of European and Asian machinery.

In medical imaging devices, NNU 4921 B/SPW33 Bearing’s precision and smooth operation are essential for accurate diagnostics. The grease or oil lubrication options allow for flexibility in different operating environments.

NNU 4921 B/SPW33 Bearing also finds use in consumer electronics, particularly in high-end printers and scanners, where its reliability ensures consistent performance. The temperature range of -30° to 110 °C makes it adaptable to various climates and conditions.

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