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

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

The NNU 4921 BK/SPW33 is a double-row cylindrical roller bearing with a 105mm tapered bore and 145mm outer diameter, crafted from high-quality chrome steel. It handles combined loads up to 29250 lbf and reaches speeds of 6000 RPM.

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

With a 1:12 taper bore, it ensures secure fitting on shafts, and the 40mm width offers a compact yet robust solution. The chamfered edges on both inner and outer rings make installation easier.

Ideal for precision applications like machine tool spindles or industrial gearboxes, this bearing is interchangeable with SKF models. Compliant with RoHS and REACH standards, it’s a reliable choice for demanding environments. Weighing 2kg, it balances strength and practicality.

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Product Parameters

  • Part Number NNU 4921 BK/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 Taper 1:12
  • For Load Direction Combined
  • Construction Double Row
  • Seal Type Open
  • Bore Dia 105 mm
  • Bore Dia Tolerance 0 to +0.020mm
  • 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.) 0.6 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 BK/SPW33 dimension drawing
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Features

Performance Features of NNU 4921 BK/SPW33 Bearing

NNU 4921 BK/SPW33 Bearing is built with chrome steel rings and rollers, offering high resistance to combined loads.
Its dynamic radial load capacity reaches 29,250 lbf, making it suitable for demanding industrial applications.

The double-row cylindrical design ensures stability and precision in high-speed operations.
With a maximum speed of 6,000 rpm, it delivers consistent performance under various conditions.

NNU 4921 BK/SPW33 Bearing operates efficiently 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 simplifies installation and ensures a secure fit.
This feature enhances the bearing’s reliability in heavy-duty applications.

Application

Industrial Uses of NNU 4921 BK/SPW33 Bearing
NNU 4921 BK/SPW33 Bearing is commonly used in heavy-duty machine tools, where its double-row design handles combined radial and axial loads efficiently. The open seal type allows for easy lubrication, making it suitable for high-speed operations up to 6000 rpm.

Where Is NNU 4921 BK/SPW33 Bearing Used?
In automotive applications, NNU 4921 BK/SPW33 Bearing supports gearboxes and drivetrains, thanks to its high dynamic radial load capacity. The chrome steel construction ensures durability even under demanding conditions.

Built for Heavy-Duty Use: NNU 4921 BK/SPW33 Bearing
NNU 4921 BK/SPW33 Bearing excels in industrial fans and compressors, where its tapered bore provides secure fitting. The grease or oil lubrication options make it adaptable to various operating environments.

Automotive vs Aerospace: Applications of NNU 4921 BK/SPW33 Bearing
In automotive systems, NNU 4921 BK/SPW33 Bearing is ideal for transmissions, while in aerospace, it supports auxiliary equipment. Its precision engineering ensures reliable performance in both sectors.

Perfect Fit for Automation: NNU 4921 BK/SPW33 Bearing
NNU 4921 BK/SPW33 Bearing is a great choice for robotic arms and automated production lines. The high static radial load capacity ensures stability during repetitive movements.

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