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Double Row Super-Precision Cylindrical Roller Bearings NNU 4934 BK/SPW33

Double Row Super-Precision Cylindrical Roller Bearings NNU 4934 BK/SPW33

The NNU 4934 BK/SPW33 is a double-row cylindrical roller bearing with a 170mm tapered bore and 230mm outer diameter, crafted from high-quality chrome steel. It handles combined loads up to 75600 lbf and operates smoothly at speeds up to 4000 RPM.

Its open design allows for easy lubrication with grease or oil, while the double-row construction provides excellent stability. 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 heavy-duty applications like machine tools or industrial gearboxes where precision and durability are key.

Weighing 6.95kg, it’s built to last while meeting RoHS and REACH standards for safety and compliance.

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Product Parameters

  • Part Number NNU 4934 BK/SPW33
  • Size 170 mm x 230 mm x 60 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 170 mm
  • Bore Dia Tolerance 0 to +0.025mm
  • Outer Dia 230 mm
  • Outer Dia Tolerance -0.015mm to 0
  • Width 60 mm
  • Width Tolerance -0.25mm to 0
  • Chamfer Dimension Outer Ring(r1,2)(min.) 2 mm
  • Chamfer Dimension Inner Ring(r3,4)(min.) 2 mm
  • Permissible Axial Displacement(max.) 2 mm
  • Ring Material Chrome Steel
  • Roller Material Chrome Steel
  • Dynamic Radial Load 75600 lbf
  • Static Radial Load 156375 lbf
  • Max Speed 4000 rpm
  • Lubrication Grease, Oil
  • Temperature Range -30° to 110 °C
  • RoHS Compliant
  • REACH Compliant
  • Weight 6.95 kg
  • Width Annular Lubrication Groove Outer Ring(B1) 5.5 mm
  • Diameter Lubrication Hole (outer Ring) (K) 3 mm
  • Shoulder Dia Outer Ring 210.9 mm
  • Raceway Diameter Inner Ring 188.5 mm
Double Row Super-Precision Cylindrical Roller Bearings NNU 4934 BK/SPW33 dimension drawing
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Features

Performance Features of NNU 4934 BK/SPW33 Bearing

NNU 4934 BK/SPW33 Bearing is built with chrome steel rings and rollers, offering strong resistance to combined loads.
Its dynamic radial load capacity reaches 75600 lbf, ensuring reliable performance in demanding conditions.

The double-row cylindrical design enhances stability and load distribution, reducing wear over time.
With a maximum speed of 4000 rpm, it balances durability and efficiency for precision applications.

NNU 4934 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, minimising slippage during operation.
This bearing is ideal for high-precision machinery requiring consistent performance under heavy loads.

Application

Common Applications of NNU 4934 BK/SPW33 Bearing
NNU 4934 BK/SPW33 Bearing is widely used in machine tools, where its double-row design handles both radial and axial loads with precision. The tapered bore ensures a secure fit, reducing slippage during high-speed operations.

In wind turbines, NNU 4934 BK/SPW33 Bearing supports the main shaft, thanks to its high dynamic radial load capacity. The open seal design allows for easy lubrication, extending service life in harsh conditions.

For printing machinery, NNU 4934 BK/SPW33 Bearing provides smooth rotation, essential for maintaining print quality. Its chrome steel construction resists wear, even under continuous use.

Where Is NNU 4934 BK/SPW33 Bearing Used?
NNU 4934 BK/SPW33 Bearing is a go-to choice for gearboxes in heavy machinery, where combined loads are common. The grease or oil lubrication options adapt to various operational needs.

In paper mills, NNU 4934 BK/SPW33 Bearing ensures reliable performance in rollers, handling both speed and load demands. The metric dimensions make it compatible with standard industrial equipment.

Built for Heavy-Duty Use: NNU 4934 BK/SPW33 Bearing
NNU 4934 BK/SPW33 Bearing excels in steel rolling mills, where its static radial load capacity withstands extreme pressures. The chamfered edges reduce stress concentrations, enhancing durability.

For robotics, NNU 4934 BK/SPW33 Bearing offers precise movement in articulated arms. Its temperature range suits both indoor and outdoor applications.

Automotive vs Aerospace: Applications of NNU 4934 BK/SPW33 Bearing
In automotive testing rigs, NNU 4934 BK/SPW33 Bearing handles high-speed rotations, ensuring accurate results. The combined load capability mimics real-world driving conditions.

For aerospace components, NNU 4934 BK/SPW33 Bearing’s lightweight design and high rpm tolerance make it ideal for auxiliary systems. The chrome steel material meets stringent industry standards.

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