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Double Row Super-Precision Cylindrical Roller Bearings NNU 4968 BK/SPW33

Double Row Super-Precision Cylindrical Roller Bearings NNU 4968 BK/SPW33

The NNU 4968 BK/SPW33 is a double-row cylindrical roller bearing with a 340mm bore and 460mm outer diameter, built for combined loads. Made from durable chrome steel, it handles radial loads up to 247500 lbf and speeds of 2000 RPM.

Its open design allows flexible lubrication with grease or oil, while the tapered bore ensures secure fitting. The bearing operates smoothly in temperatures from -30°C to 110°C.

With a 118mm width and 56kg weight, it’s robust for heavy-duty applications like industrial gearboxes or large machinery. Compliant with RoHS and REACH standards, it’s a reliable choice for precision engineering needs.

Interchangeable with SKF bearings, this model offers easy replacement. The annular lubrication groove and holes simplify maintenance, making it practical for long-term use.

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Product Parameters

  • Part Number NNU 4968 BK/SPW33
  • Size 340 mm x 460 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 340 mm
  • Bore Dia Tolerance 0 to +0.040mm
  • Outer Dia 460 mm
  • Outer Dia Tolerance -0.023mm to 0
  • Width 118 mm
  • Width Tolerance -0.40mm to 0
  • Chamfer Dimension Outer Ring(r1,2)(min.) 3 mm
  • Chamfer Dimension Inner Ring(r3,4)(min.) 1.5 mm
  • Permissible Axial Displacement(max.) 5.5 mm
  • Ring Material Chrome Steel
  • Roller Material Chrome Steel
  • Dynamic Radial Load 247500 lbf
  • Static Radial Load 596250 lbf
  • Max Speed 2000 rpm
  • Lubrication Grease, Oil
  • Temperature Range -30° to 110 °C
  • RoHS Compliant
  • REACH Compliant
  • Weight 56 kg
  • Width Annular Lubrication Groove Outer Ring(B1) 16.7 mm
  • Diameter Lubrication Hole (outer Ring) (K) 9 mm
  • Shoulder Dia Outer Ring 419 mm
  • Raceway Diameter Inner Ring 379 mm
Double Row Super-Precision Cylindrical Roller Bearings NNU 4968 BK/SPW33 dimension drawing
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Features

Performance Features of NNU 4968 BK/SPW33 Bearing

NNU 4968 BK/SPW33 Bearing is built with chrome steel rings and rollers, offering strong resistance to combined loads.
Its dynamic radial load capacity reaches 247500 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 2000 rpm, it balances durability and efficiency in demanding conditions.

NNU 4968 BK/SPW33 Bearing operates smoothly in temperatures ranging from -30° to 110°C.
Its open design allows for easy lubrication with grease or oil, extending service life.

The tapered bore design ensures secure fitting, reducing slippage during operation.
Precision engineering minimises noise and vibration, making it suitable for high-precision tasks.

Application

Industrial Uses of NNU 4968 BK/SPW33 Bearing
NNU 4968 BK/SPW33 Bearing is commonly used in heavy industrial machinery, such as large gearboxes and rolling mills, where its double-row design handles both radial and axial loads efficiently. The tapered bore ensures a secure fit, reducing the risk of slippage during operation.

Where Is NNU 4968 BK/SPW33 Bearing Used?
In wind turbines, NNU 4968 BK/SPW33 Bearing supports the main shaft, providing stability under high wind loads. Its chrome steel construction offers durability in harsh outdoor conditions.

Built for Heavy-Duty Use: NNU 4968 BK/SPW33 Bearing
NNU 4968 BK/SPW33 Bearing excels in paper manufacturing equipment, where its high dynamic load capacity ensures smooth operation. The open design allows for easy lubrication, extending service life.

Automotive vs Aerospace: Applications of NNU 4968 BK/SPW33 Bearing
In automotive applications, NNU 4968 BK/SPW33 Bearing is found in large trucks and buses, handling combined loads in transmissions. For aerospace, it’s used in ground support equipment, where precision and reliability are key.

Key Fields for NNU 4968 BK/SPW33 Bearing
NNU 4968 BK/SPW33 Bearing is ideal for mining equipment, such as crushers and conveyors, where its robust design withstands heavy loads. The grease or oil lubrication options adapt to various operating conditions.

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