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Double Row Super-Precision Cylindrical Roller Bearings NNU 4920 BK/SPW33

Double Row Super-Precision Cylindrical Roller Bearings NNU 4920 BK/SPW33

The NNU 4920 BK/SPW33 is a double-row cylindrical roller bearing with a 100mm bore and 140mm outer diameter, crafted from robust chrome steel. It handles combined loads up to 28800 lbf and runs smoothly at speeds up to 6000 RPM.

Its open design allows flexible lubrication with grease or oil, while the tapered bore ensures secure fitting. The bearing operates reliably in temperatures 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 present.

Weighing 1.9kg, it’s built for durability without excessive bulk. Compliant with RoHS and REACH standards for safe industrial use.

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Product Parameters

  • Part Number NNU 4920 BK/SPW33
  • Size 100 mm x 140 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 100 mm
  • Bore Dia Tolerance 0 to +0.020mm
  • Outer Dia 140 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 28800 lbf
  • Static Radial Load 57375 lbf
  • Max Speed 6000 rpm
  • Lubrication Grease, Oil
  • Temperature Range -30° to 110 °C
  • RoHS Compliant
  • REACH Compliant
  • Weight 1.9 kg
  • Width Annular Lubrication Groove Outer Ring(B1) 5.5 mm
  • Diameter Lubrication Hole (outer Ring) (K) 3 mm
  • Shoulder Dia Outer Ring 125.8 mm
  • Raceway Diameter Inner Ring 113 mm
Double Row Super-Precision Cylindrical Roller Bearings NNU 4920 BK/SPW33 dimension drawing
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Features

Performance Features of NNU 4920 BK/SPW33 Bearing

NNU 4920 BK/SPW33 Bearing is built with a double-row cylindrical roller design, offering excellent load distribution for combined load applications.
Its chrome steel construction ensures durability and resistance to wear under high radial loads.
The bearing’s dynamic radial load capacity of 28,800 lbf makes it suitable for demanding industrial environments.
With a maximum speed of 6,000 rpm, it delivers reliable performance in precision applications.

How Is NNU 4920 BK/SPW33 Bearing Engineered for Reliability?

NNU 4920 BK/SPW33 Bearing features a tapered bore design, ensuring secure mounting and alignment for precise operation.
The open seal type allows for easy lubrication, enhancing its performance in various conditions.
Its permissible axial displacement of 1.1 mm accommodates slight misalignments without compromising functionality.
The bearing’s temperature range of -30° to 110 °C ensures stability in diverse working environments.

Designed for Durability: NNU 4920 BK/SPW33 Bearing

NNU 4920 BK/SPW33 Bearing’s chrome steel rollers and rings provide long-lasting performance under heavy loads.
The annular lubrication groove in the outer ring ensures consistent grease or oil distribution, reducing friction.
With a static radial load capacity of 57,375 lbf, it handles high-stress applications with ease.
Its precision engineering makes it ideal for machinery requiring accurate and smooth operation.

Steel vs Ceramic Bearings: Strengths of NNU 4920 BK/SPW33 Bearing

NNU 4920 BK/SPW33 Bearing uses high-quality chrome steel for both rings and rollers, offering superior strength and durability.
The material choice ensures resistance to wear and fatigue, even in high-speed applications.
Its double-row design enhances load-carrying capacity compared to single-row alternatives.
The bearing’s compatibility with both grease and oil lubrication adds versatility for different operational needs.

Application

Industrial Uses of NNU 4920 BK/SPW33 Bearing
NNU 4920 BK/SPW33 Bearing is commonly used in machine tools, where its double-row design handles both radial and axial loads efficiently. The open seal type allows for easy lubrication, making it suitable for high-speed operations.

In automotive applications, NNU 4920 BK/SPW33 Bearing supports gearboxes and drivetrains, ensuring smooth performance under combined loads. Its chrome steel construction provides durability in demanding conditions.

For automation systems, NNU 4920 BK/SPW33 Bearing is ideal for robotic arms and precision equipment, thanks to its high-speed capability and tapered bore. The metric sizing ensures compatibility with various industrial standards.

Where Is NNU 4920 BK/SPW33 Bearing Used?
NNU 4920 BK/SPW33 Bearing is found in wind turbines, where its ability to handle heavy loads and high speeds is crucial. The grease or oil lubrication options make it adaptable to different environments.

In medical imaging devices, NNU 4920 BK/SPW33 Bearing offers reliable performance due to its precision engineering. The chrome steel rollers ensure minimal wear over time.

Built for Heavy-Duty Use: NNU 4920 BK/SPW33 Bearing
NNU 4920 BK/SPW33 Bearing excels in rolling mills, where its combined load capacity and high-speed tolerance are essential. The tapered bore design simplifies installation and alignment.

For conveyor systems, NNU 4920 BK/SPW33 Bearing provides consistent performance under continuous operation. Its dynamic radial load capacity ensures longevity in industrial settings.

Automotive vs Aerospace: Applications of NNU 4920 BK/SPW33 Bearing
In automotive systems, NNU 4920 BK/SPW33 Bearing is used in transmissions, where its combined load handling is beneficial. The high-speed rating makes it suitable for performance vehicles.

In aerospace, NNU 4920 BK/SPW33 Bearing supports auxiliary systems, offering reliability in extreme conditions. The temperature range ensures performance from -30° to 110 °C.

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