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Double Row Super-Precision Cylindrical Roller Bearings NNU 4956 BK/SPW33

Double Row Super-Precision Cylindrical Roller Bearings NNU 4956 BK/SPW33

The NNU 4956 BK/SPW33 is a double-row cylindrical roller bearing with a 280mm bore and 380mm outer diameter, built from sturdy chrome steel. It handles combined loads up to 172125 lbf and runs smoothly at speeds up to 2000 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 heavy machinery or industrial equipment where precision and durability are key.

Weighing 32.5kg, 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 4956 BK/SPW33
  • Size 280 mm x 380 mm x 100 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 280 mm
  • Bore Dia Tolerance 0 to +0.035mm
  • Outer Dia 380 mm
  • Outer Dia Tolerance -0.020mm to 0
  • Width 100 mm
  • Width Tolerance -0.35mm to 0
  • Chamfer Dimension Outer Ring(r1,2)(min.) 2.1 mm
  • Chamfer Dimension Inner Ring(r3,4)(min.) 1.1 mm
  • Permissible Axial Displacement(max.) 4.5 mm
  • Ring Material Chrome Steel
  • Roller Material Chrome Steel
  • Dynamic Radial Load 172125 lbf
  • Static Radial Load 405000 lbf
  • Max Speed 2000 rpm
  • Lubrication Grease, Oil
  • Temperature Range -30° to 110 °C
  • RoHS Compliant
  • REACH Compliant
  • Weight 32.5 kg
  • Width Annular Lubrication Groove Outer Ring(B1) 13.9 mm
  • Diameter Lubrication Hole (outer Ring) (K) 3 mm
  • Shoulder Dia Outer Ring 345.6 mm
  • Raceway Diameter Inner Ring 312 mm
Double Row Super-Precision Cylindrical Roller Bearings NNU 4956 BK/SPW33 dimension drawing
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Features

Performance Features of NNU 4956 BK/SPW33 Bearing

NNU 4956 BK/SPW33 Bearing is built with chrome steel rings and rollers, offering high resistance to combined loads.
Its dynamic radial load capacity reaches 172125 lbf, ensuring stability in demanding applications.

The double-row cylindrical design enhances load distribution, reducing stress on individual rollers.
This construction improves precision and extends the bearing’s operational life.

NNU 4956 BK/SPW33 Bearing operates smoothly at speeds up to 2000 rpm, balancing performance and durability.
Its open design allows for easy lubrication with grease or oil, maintaining efficiency.

With a temperature range of -30° to 110 °C, NNU 4956 BK/SPW33 Bearing performs reliably in varied conditions.
The tapered bore ensures secure fitting, minimising misalignment risks.

NNU 4956 BK/SPW33 Bearing’s design includes lubrication grooves, promoting consistent performance.
This feature reduces maintenance needs and enhances long-term reliability.

Application

Common Applications of NNU 4956 BK/SPW33 Bearing
NNU 4956 BK/SPW33 Bearing is widely used in industrial machinery, especially in heavy-duty applications like large machine tools and rolling mills. Its double-row design provides excellent radial load capacity, making it suitable for high-precision environments.

In the automotive sector, NNU 4956 BK/SPW33 Bearing can be found in gearboxes and drivetrains, where its combined load handling ensures smooth operation. The taper bore design allows for easy installation and secure fitting in rotating components.

For automation systems, NNU 4956 BK/SPW33 Bearing supports robotic arms and precision equipment, thanks to its high-speed capabilities. The open seal type facilitates lubrication, ensuring long service life in demanding conditions.

Medical imaging devices also benefit from NNU 4956 BK/SPW33 Bearing’s precision and reliability. The chrome steel construction ensures durability, while the grease lubrication option reduces maintenance needs.

In wind turbines, NNU 4956 BK/SPW33 Bearing handles the high radial loads and variable speeds typical of such applications. Its robust design and temperature tolerance make it a dependable choice for renewable energy systems.

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