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Double Row Super-Precision Cylindrical Roller Bearings NNU 4960 BK/SPW33

Double Row Super-Precision Cylindrical Roller Bearings NNU 4960 BK/SPW33

The NNU 4960 BK/SPW33 is a double-row cylindrical roller bearing with a 300mm tapered bore and 420mm outer diameter, built for combined loads. Made from durable chrome steel, it handles radial loads up to 229500 lbf and spins smoothly at 2000 RPM.

Its open design allows easy lubrication with grease or oil, while the double-row construction provides stability under heavy loads. 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 high-precision applications like machine tools or industrial gearboxes where both radial and axial loads are present.

Weighing 50kg, it’s a robust unit designed for long-lasting performance. Compliant with RoHS and REACH standards for safe use.

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Product Parameters

  • Part Number NNU 4960 BK/SPW33
  • Size 300 mm x 420 mm x 118 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 300 mm
  • Bore Dia Tolerance 0 to +0.035mm
  • Outer Dia 420 mm
  • Outer Dia Tolerance -0.023mm to 0
  • Width 118 mm
  • Width Tolerance -0.35mm to 0
  • Chamfer Dimension Outer Ring(r1,2)(min.) 3 mm
  • Chamfer Dimension Inner Ring(r3,4)(min.) 1.1 mm
  • Permissible Axial Displacement(max.) 5.5 mm
  • Ring Material Chrome Steel
  • Roller Material Chrome Steel
  • Dynamic Radial Load 229500 lbf
  • Static Radial Load 531000 lbf
  • Max Speed 2000 rpm
  • Lubrication Grease, Oil
  • Temperature Range -30° to 110 °C
  • RoHS Compliant
  • REACH Compliant
  • Weight 50 kg
  • Width Annular Lubrication Groove Outer Ring(B1) 16.7 mm
  • Diameter Lubrication Hole (outer Ring) (K) 3 mm
  • Shoulder Dia Outer Ring 379 mm
  • Raceway Diameter Inner Ring 339 mm
Double Row Super-Precision Cylindrical Roller Bearings NNU 4960 BK/SPW33 dimension drawing
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Features

How Is NNU 4960 BK/SPW33 Bearing Engineered for Reliability?

NNU 4960 BK/SPW33 Bearing features a double-row cylindrical roller design, providing strong resistance to combined loads.

Its chrome steel construction ensures durability, with a dynamic radial load capacity of 229500 lbf.

The tapered bore design allows for precise alignment, enhancing performance in high-speed applications.

With a maximum speed of 2000 rpm, it balances efficiency and reliability in demanding conditions.

What Makes NNU 4960 BK/SPW33 Bearing Suitable for High-Temperature Applications?

NNU 4960 BK/SPW33 Bearing operates smoothly in temperatures ranging from -30° to 110 °C.

Its chrome steel rollers and rings maintain performance even under thermal stress.

The open seal design allows for effective lubrication, reducing friction and heat buildup.

This makes it ideal for industrial applications where temperature variations are common.

Designed for Durability: NNU 4960 BK/SPW33 Bearing

NNU 4960 BK/SPW33 Bearing is built with precision-ground chrome steel rollers for long-lasting performance.

Its double-row construction distributes loads evenly, reducing wear and extending service life.

The annular lubrication groove ensures consistent grease distribution, minimising maintenance needs.

With a static radial load capacity of 531000 lbf, it handles heavy-duty applications with ease.

Steel vs Ceramic Bearings: Strengths of NNU 4960 BK/SPW33 Bearing

NNU 4960 BK/SPW33 Bearing uses high-quality chrome steel for both rings and rollers, offering excellent strength.

This material choice provides superior load capacity compared to ceramic alternatives in industrial settings.

The bearing’s design ensures reliable operation under heavy radial and axial loads.

Its compatibility with both grease and oil lubrication adds versatility in various applications.

Application

Industrial Uses of NNU 4960 BK/SPW33 Bearing
NNU 4960 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, making it suitable for high-speed operations up to 2000 rpm.

Where Is NNU 4960 BK/SPW33 Bearing Used?
In wind turbines, NNU 4960 BK/SPW33 Bearing supports the main shaft, providing stability under dynamic radial loads. Its chrome steel construction ensures durability in harsh outdoor conditions, while the tapered bore simplifies installation.

Built for Heavy-Duty Use: NNU 4960 BK/SPW33 Bearing
NNU 4960 BK/SPW33 Bearing excels in paper manufacturing equipment, where its high static radial load capacity (531000 lbf) prevents deformation under constant pressure. The grease or oil lubrication options adapt to varying operational demands.

Automotive vs Aerospace: Applications of NNU 4960 BK/SPW33 Bearing
In automotive testing rigs, NNU 4960 BK/SPW33 Bearing handles precise alignment requirements, thanks to its tapered bore. For aerospace applications, its temperature range (-30° to 110°C) ensures reliability in extreme environments.

Key Fields for NNU 4960 BK/SPW33 Bearing
NNU 4960 BK/SPW33 Bearing is ideal for hydraulic pumps, where its axial displacement tolerance (5.5 mm) accommodates shaft movements. The annular lubrication groove extends service life by ensuring consistent grease distribution.

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