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

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

The NNU 4956 B/SPW33 is a double-row cylindrical roller bearing with a 280mm bore and 380mm outer diameter, built for combined loads. Made from durable chrome steel, it handles radial loads up to 172125 lbf and speeds up to 2000 RPM.

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

With a weight of 32.5kg, it’s designed for robust industrial use. Compliant with RoHS and REACH standards, it’s a reliable choice for machinery requiring precision and durability.

Ideal for applications like heavy-duty gearboxes or industrial presses where high radial loads and precision alignment are needed. Interchangeable with SKF bearings for easy replacement.

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Product Parameters

  • Part Number NNU 4956 B/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 Cylindrical
  • For Load Direction Combined
  • Construction Double Row
  • Seal Type Open
  • Bore Dia 280 mm
  • Bore Dia Tolerance -0.018mm to 0
  • 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.) 2.1 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 B/SPW33 dimension drawing
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Features

Performance Features of NNU 4956 B/SPW33 Bearing

NNU 4956 B/SPW33 Bearing is built with chrome steel rings and rollers, offering strong resistance to combined loads.
Its dynamic radial load capacity reaches 172125 lbf, ensuring reliable performance in demanding conditions.

The double-row design enhances stability and load distribution, making it suitable for precision applications.
With a maximum speed of 2000 rpm, it balances durability and efficiency.

NNU 4956 B/SPW33 Bearing operates smoothly in temperatures ranging from -30° to 110°C.
Its open construction allows for easy lubrication with grease or oil, reducing maintenance needs.

The precise tolerances and chamfer dimensions ensure easy installation and alignment.
This bearing is ideal for applications requiring high precision and long service life.

Application

Industrial Uses of NNU 4956 B/SPW33 Bearing
NNU 4956 B/SPW33 Bearing is commonly used in heavy machinery like rolling mills and gearboxes, where its double-row design handles combined radial and axial loads efficiently. The open seal type allows for easy lubrication, ensuring long service life in demanding conditions.

Where Is NNU 4956 B/SPW33 Bearing Used?
In wind turbines, NNU 4956 B/SPW33 Bearing supports the main shaft, providing stability under high dynamic loads. Its chrome steel construction ensures reliability even in harsh outdoor environments.

Built for Heavy-Duty Use: NNU 4956 B/SPW33 Bearing
NNU 4956 B/SPW33 Bearing excels in industrial presses, where its high static radial load capacity prevents deformation under extreme pressure. The grease or oil lubrication options make it adaptable to different operating conditions.

Automotive vs Aerospace: Applications of NNU 4956 B/SPW33 Bearing
In automotive applications, NNU 4956 B/SPW33 Bearing is found in large truck transmissions, offering durability under heavy loads. For aerospace, its precision makes it suitable for landing gear systems, where reliability is critical.

Key Fields for NNU 4956 B/SPW33 Bearing
NNU 4956 B/SPW33 Bearing is ideal for machine tools, providing smooth rotation and high rigidity. The wide temperature range ensures consistent performance in both hot and cold environments.

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