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Double Row Super-Precision Cylindrical Roller Bearings NNU 4972 BK/SPW33

Double Row Super-Precision Cylindrical Roller Bearings NNU 4972 BK/SPW33

The NNU 4972 BK/SPW33 is a double-row cylindrical roller bearing with a 360mm bore and 480mm outer diameter, built from sturdy chrome steel. It handles combined loads with a dynamic radial capacity of 252000 lbf and spins smoothly at 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 reliably in temperatures from -30°C to 110°C, making it suitable for demanding environments.

This model is interchangeable with SKF bearings, offering flexibility for replacements. Ideal for heavy machinery, industrial gearboxes, or applications requiring high precision and load capacity.

Weighing 55kg, it’s robust yet manageable for its size. Compliant with RoHS and REACH standards, it’s a dependable choice for engineers and maintenance teams.

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Product Parameters

  • Part Number NNU 4972 BK/SPW33
  • Size 360 mm x 480 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 360 mm
  • Bore Dia Tolerance 0 to +0.040mm
  • Outer Dia 480 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 252000 lbf
  • Static Radial Load 630000 lbf
  • Max Speed 2000 rpm
  • Lubrication Grease, Oil
  • Temperature Range -30° to 110 °C
  • RoHS Compliant
  • REACH Compliant
  • Weight 55 kg
  • Width Annular Lubrication Groove Outer Ring(B1) 16.7 mm
  • Diameter Lubrication Hole (outer Ring) (K) 9 mm
  • Shoulder Dia Outer Ring 439 mm
  • Raceway Diameter Inner Ring 399 mm
Double Row Super-Precision Cylindrical Roller Bearings NNU 4972 BK/SPW33 dimension drawing
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Features

Performance Features of NNU 4972 BK/SPW33 Bearing

NNU 4972 BK/SPW33 Bearing is built with chrome steel rings and rollers, offering strong resistance to combined loads.
Its dynamic radial load capacity reaches 252,000 lbf, ensuring reliable performance in demanding applications.

The double-row cylindrical design enhances stability and load distribution, reducing wear over time.
With a maximum speed of 2,000 rpm, it balances durability and efficiency in high-speed operations.

NNU 4972 BK/SPW33 Bearing operates smoothly in temperatures ranging from -30° to 110°C.
Its open design allows for flexible lubrication options, either grease or oil, to suit different needs.

The tapered bore design ensures secure fitting, minimising misalignment during installation.
This makes NNU 4972 BK/SPW33 Bearing a practical choice for precision machinery.

Application

Industrial Uses of NNU 4972 BK/SPW33 Bearing
NNU 4972 BK/SPW33 Bearing is commonly used in heavy industrial machinery, such as large gearboxes and rolling mills, where its double-row design handles combined radial and axial loads efficiently. The tapered bore ensures a secure fit, reducing slippage during high-speed operations.

What Makes NNU 4972 BK/SPW33 Bearing a Preferred Choice?
In wind turbine applications, NNU 4972 BK/SPW33 Bearing’s high dynamic radial load capacity makes it reliable for supporting rotor shafts. Its chrome steel construction also withstands harsh environmental conditions, ensuring long service life.

Built for Heavy-Duty Use: NNU 4972 BK/SPW33 Bearing
For mining equipment, NNU 4972 BK/SPW33 Bearing’s open design allows easy lubrication, maintaining performance in dusty environments. The wide temperature range ensures functionality even in extreme climates.

Automotive vs Aerospace: Applications of NNU 4972 BK/SPW33 Bearing
In automotive testing rigs, NNU 4972 BK/SPW33 Bearing provides precision under high loads, while in aerospace, its lightweight yet robust design suits auxiliary power units. The metric sizing ensures compatibility across global standards.

Where Is NNU 4972 BK/SPW33 Bearing Used?
NNU 4972 BK/SPW33 Bearing is ideal for paper manufacturing machinery, where its high static radial load capacity supports heavy rollers. The grease or oil lubrication options adapt to various operational needs.

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