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Double Row Super-Precision Cylindrical Roller Bearings NNU 4948 B/SPW33

Double Row Super-Precision Cylindrical Roller Bearings NNU 4948 B/SPW33

The NNU 4948 B/SPW33 is a double-row cylindrical roller bearing with a 240mm bore and 320mm outer diameter, built from tough chrome steel. It handles combined loads up to 118800 lbf and runs smoothly at speeds up to 3000 RPM.

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

This model is interchangeable with SKF bearings, making it a practical choice for replacements. Ideal for heavy machinery or industrial equipment where high radial loads are common.

Weighing 17.5kg, 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 4948 B/SPW33
  • Size 240 mm x 320 mm x 80 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 240 mm
  • Bore Dia Tolerance -0.015mm to 0
  • Outer Dia 320 mm
  • Outer Dia Tolerance -0.020mm to 0
  • Width 80 mm
  • Width Tolerance -0.30mm 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.) 3.7 mm
  • Ring Material Chrome Steel
  • Roller Material Chrome Steel
  • Dynamic Radial Load 118800 lbf
  • Static Radial Load 274500 lbf
  • Max Speed 3000 rpm
  • Lubrication Grease, Oil
  • Temperature Range -30° to 110 °C
  • RoHS Compliant
  • REACH Compliant
  • Weight 17.5 kg
  • Width Annular Lubrication Groove Outer Ring(B1) 11.1 mm
  • Diameter Lubrication Hole (outer Ring) (K) 3 mm
  • Shoulder Dia Outer Ring 292.2 mm
  • Raceway Diameter Inner Ring 265 mm
Double Row Super-Precision Cylindrical Roller Bearings NNU 4948 B/SPW33 dimension drawing
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Features

Performance Features of NNU 4948 B/SPW33 Bearing

NNU 4948 B/SPW33 Bearing is built with chrome steel rings and rollers, offering strong resistance to combined loads.
Its dynamic radial load capacity reaches 118,800 lbf, making it suitable for heavy-duty applications.

The double-row cylindrical design ensures stability and precision in high-speed operations.
With a maximum speed of 3,000 rpm, it delivers reliable performance in demanding conditions.

NNU 4948 B/SPW33 Bearing operates efficiently within a temperature range of -30° to 110°C.
Its open design allows for easy lubrication with grease or oil, reducing maintenance needs.

The bearing’s chamfer dimensions and permissible axial displacement enhance its installation flexibility.
This makes NNU 4948 B/SPW33 Bearing a practical choice for various industrial applications.

Application

Industrial Uses of NNU 4948 B/SPW33 Bearing
NNU 4948 B/SPW33 Bearing is commonly used in heavy machinery like large lathes and milling machines, where its double-row design handles both radial and axial loads efficiently. The open seal type allows for easy lubrication, ensuring long service life in demanding conditions.

Where Is NNU 4948 B/SPW33 Bearing Used?
In wind turbines, NNU 4948 B/SPW33 Bearing supports the main shaft, providing stability under high radial loads. Its chrome steel construction ensures durability even in harsh outdoor environments.

Built for Heavy-Duty Use: NNU 4948 B/SPW33 Bearing
NNU 4948 B/SPW33 Bearing excels in steel rolling mills, where its high dynamic load capacity keeps operations smooth. The grease or oil lubrication options make it adaptable to different maintenance schedules.

Automotive vs Aerospace: Applications of NNU 4948 B/SPW33 Bearing
In automotive gearboxes, NNU 4948 B/SPW33 Bearing handles combined loads with precision, while in aerospace, its high-speed capability suits auxiliary power units. The metric sizing ensures compatibility across industries.

What Makes NNU 4948 B/SPW33 Bearing a Preferred Choice?
For paper manufacturing equipment, NNU 4948 B/SPW33 Bearing’s robust design withstands constant vibration and moisture. The wide temperature range also makes it reliable in varying operational conditions.

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