+86 15806631151 [email protected]
TFL BEARINGS
REQUEST A QUOTE
Double Row Super-Precision Cylindrical Roller Bearings NNU 4938 BK/SPW33

Double Row Super-Precision Cylindrical Roller Bearings NNU 4938 BK/SPW33

The NNU 4938 BK/SPW33 is a double-row cylindrical roller bearing with a 190mm tapered bore and 260mm outer diameter, crafted from durable chrome steel. It manages combined loads up to 90450 lbf and operates smoothly at speeds up to 3000 RPM.

Its open design allows flexible lubrication with grease or oil, while the double-row construction enhances 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 precision machinery like gearboxes or industrial equipment where high radial loads are common.

Weighing 11kg, it’s robust yet manageable for its size. Compliant with RoHS and REACH standards for safe and eco-friendly use.

Get A Free Quote
    Description Features Application Q&A Featured Products Our Process

Product Parameters

  • Part Number NNU 4938 BK/SPW33
  • Size 190 mm x 260 mm x 69 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 190 mm
  • Bore Dia Tolerance 0 to +0.030mm
  • Outer Dia 260 mm
  • Outer Dia Tolerance -0.018mm to 0
  • Width 69 mm
  • Width Tolerance -0.30mm to 0
  • Chamfer Dimension Outer Ring(r1,2)(min.) 2 mm
  • Chamfer Dimension Inner Ring(r3,4)(min.) 1 mm
  • Permissible Axial Displacement(max.) 1.1 mm
  • Ring Material Chrome Steel
  • Roller Material Chrome Steel
  • Dynamic Radial Load 90450 lbf
  • Static Radial Load 198000 lbf
  • Max Speed 3000 rpm
  • Lubrication Grease, Oil
  • Temperature Range -30° to 110 °C
  • RoHS Compliant
  • REACH Compliant
  • Weight 11 kg
  • Width Annular Lubrication Groove Outer Ring(B1) 8.3 mm
  • Diameter Lubrication Hole (outer Ring) (K) 3 mm
  • Shoulder Dia Outer Ring 236 mm
  • Raceway Diameter Inner Ring 212 mm
Double Row Super-Precision Cylindrical Roller Bearings NNU 4938 BK/SPW33 dimension drawing
Download DWG Download PDF

Features

Performance Features of NNU 4938 BK/SPW33 Bearing

NNU 4938 BK/SPW33 Bearing is built with chrome steel rings and rollers, offering high resistance to combined loads.
Its dynamic radial load capacity reaches 90450 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 3000 rpm, it balances performance and durability.

NNU 4938 BK/SPW33 Bearing operates efficiently in temperatures ranging from -30° to 110°C.
Its open seal type allows for easy lubrication with grease or oil.

The tapered bore design simplifies installation and alignment.
This feature enhances the bearing’s reliability in demanding industrial environments.

Application

Industrial Uses of NNU 4938 BK/SPW33 Bearing
NNU 4938 BK/SPW33 Bearing is commonly used in heavy machinery like industrial gearboxes and large pumps, where its double-row design handles combined loads efficiently. The tapered bore ensures a secure fit, reducing slippage during high-speed operations.

In wind turbines, NNU 4938 BK/SPW33 Bearing supports the main shaft, offering reliable performance under dynamic radial loads. Its chrome steel construction withstands harsh environmental conditions, making it a durable choice for renewable energy applications.

For precision machine tools, NNU 4938 BK/SPW33 Bearing provides stable rotation, essential for achieving accurate cuts. The open seal design allows for easy lubrication, extending the bearing’s service life in demanding industrial settings.

What Makes NNU 4938 BK/SPW33 Bearing a Preferred Choice?
NNU 4938 BK/SPW33 Bearing excels in paper manufacturing equipment, where its high static radial load capacity ensures smooth operation. The grease or oil lubrication options adapt to different operational needs.

In steel rolling mills, NNU 4938 BK/SPW33 Bearing handles extreme loads and speeds, thanks to its robust chrome steel rollers. The permissible axial displacement accommodates slight misalignments, reducing wear over time.

For printing presses, NNU 4938 BK/SPW33 Bearing’s precision reduces vibration, ensuring consistent print quality. Its metric dimensions make it compatible with a wide range of European machinery.

Built for Heavy-Duty Use: NNU 4938 BK/SPW33 Bearing
NNU 4938 BK/SPW33 Bearing is ideal for mining equipment, where its double-row cylindrical rollers distribute loads evenly. The open seal design simplifies maintenance in dusty environments.

In marine propulsion systems, NNU 4938 BK/SPW33 Bearing’s corrosion-resistant materials perform reliably in saltwater conditions. The tapered bore ensures a tight fit, even under heavy thrust loads.

For railway applications, NNU 4938 BK/SPW33 Bearing’s high dynamic radial load capacity supports axle boxes, ensuring smooth and safe train operations. Its temperature range suits both cold and moderate climates.

Automotive vs Aerospace: Applications of NNU 4938 BK/SPW33 Bearing
In automotive testing rigs, NNU 4938 BK/SPW33 Bearing handles high-speed rotations, providing accurate data collection. Its combined load capacity makes it versatile for various test scenarios.

For aerospace ground equipment, NNU 4938 BK/SPW33 Bearing’s precision ensures reliable performance in aircraft maintenance tools. The grease lubrication option reduces friction during prolonged use.

In heavy-duty trucks, NNU 4938 BK/SPW33 Bearing supports transmission systems, where its durability extends component life. The metric sizing fits seamlessly into global vehicle designs.

Q&A

SEND INQUIRY