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Double Row Super-Precision Cylindrical Roller Bearings NNU 4940 B/SPW33

Double Row Super-Precision Cylindrical Roller Bearings NNU 4940 B/SPW33

The NNU 4940 B/SPW33 is a double-row cylindrical roller bearing with a 200mm bore and 280mm outer diameter, crafted from durable chrome steel. It handles combined loads up to 108900 lbf and operates smoothly at speeds up to 3000 RPM.

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

This model is interchangeable with SKF bearings, making it a practical choice for replacements. Ideal for industrial machinery or heavy equipment where precision and durability are key.

Weighing 15kg, it’s built to last and complies with RoHS and REACH standards for safe use. The lubrication groove and holes ensure easy maintenance.

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Product Parameters

  • Part Number NNU 4940 B/SPW33
  • Size 200 mm x 280 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 200 mm
  • Bore Dia Tolerance -0.015mm to 0
  • Outer Dia 280 mm
  • Outer Dia Tolerance -0.018mm 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 108900 lbf
  • Static Radial Load 234000 lbf
  • Max Speed 3000 rpm
  • Lubrication Grease, Oil
  • Temperature Range -30° to 110 °C
  • RoHS Compliant
  • REACH Compliant
  • Weight 15 kg
  • Width Annular Lubrication Groove Outer Ring(B1) 11.1 mm
  • Diameter Lubrication Hole (outer Ring) (K) 3 mm
  • Shoulder Dia Outer Ring 252.2 mm
  • Raceway Diameter Inner Ring 225 mm
Double Row Super-Precision Cylindrical Roller Bearings NNU 4940 B/SPW33 dimension drawing
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Features

Performance Features of NNU 4940 B/SPW33 Bearing

NNU 4940 B/SPW33 Bearing is built with chrome steel rings and rollers, offering strong resistance to combined loads.
Its dynamic radial load capacity reaches 108,900 lbf, ensuring reliable performance in heavy-duty applications.

The double-row cylindrical design enhances stability and load distribution, reducing wear over time.
With a maximum speed of 3,000 rpm, it balances precision and durability in demanding conditions.

NNU 4940 B/SPW33 Bearing operates efficiently within a temperature range of -30° to 110°C.
Its open seal type allows for easy lubrication with grease or oil, maintaining smooth operation.

The precise tolerances and chamfer dimensions ensure easy installation and alignment.
This bearing is ideal for applications requiring high radial load capacity and precision.

Application

Industrial Uses of NNU 4940 B/SPW33 Bearing
NNU 4940 B/SPW33 Bearing is commonly used in heavy industrial machinery, such as large gearboxes and rolling mills, where its double-row design handles high radial loads efficiently. The open seal type allows for easy lubrication, ensuring long service life in demanding conditions.

What Makes NNU 4940 B/SPW33 Bearing a Preferred Choice?
In precision machine tools, NNU 4940 B/SPW33 Bearing provides excellent stability and accuracy, thanks to its chrome steel construction and tight tolerances. Its ability to handle combined loads makes it versatile for complex applications.

Built for Heavy-Duty Use: NNU 4940 B/SPW33 Bearing
For wind turbine applications, NNU 4940 B/SPW33 Bearing’s high dynamic radial load capacity ensures reliable performance under varying wind conditions. The grease or oil lubrication options adapt to different operational needs.

Automotive vs Aerospace: Applications of NNU 4940 B/SPW33 Bearing
In automotive test rigs, NNU 4940 B/SPW33 Bearing supports high-speed rotations, while in aerospace, its precision and durability are valued for landing gear systems. The metric sizing ensures compatibility with global standards.

Perfect Fit for Automation: NNU 4940 B/SPW33 Bearing
NNU 4940 B/SPW33 Bearing is ideal for robotic arms in automated production lines, where its low friction and high-speed capabilities enhance efficiency. The cylindrical roller design ensures smooth motion even under heavy loads.

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