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

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

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

Its open design allows flexible lubrication with grease or oil, while the double-row construction ensures stability under heavy loads. The bearing operates well in temperatures from -30°C to 110°C.

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

Weighing 11kg, it’s built to last and complies with RoHS and REACH standards for safe use. The lubrication groove and holes simplify maintenance.

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

Product Parameters

  • Part Number NNU 4938 B/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 Cylindrical
  • For Load Direction Combined
  • Construction Double Row
  • Seal Type Open
  • Bore Dia 190 mm
  • Bore Dia Tolerance -0.015mm to 0
  • 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.) 2 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 B/SPW33 dimension drawing
Download DWG Download PDF

Features

Performance Features of NNU 4938 B/SPW33 Bearing

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

NNU 4938 B/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 precise tolerances and chamfered edges ensure easy installation and alignment.
This makes NNU 4938 B/SPW33 Bearing a practical choice for heavy-duty machinery.

Application

Industrial Uses of NNU 4938 B/SPW33 Bearing
NNU 4938 B/SPW33 Bearing is commonly used in heavy industrial machinery, such as large lathes and rolling mills, where its double-row design handles both radial and axial loads efficiently. The open seal type allows for easy lubrication, making it suitable for high-speed operations up to 3000 rpm.

What Makes NNU 4938 B/SPW33 Bearing a Preferred Choice?
In wind turbine gearboxes, NNU 4938 B/SPW33 Bearing’s chrome steel construction ensures durability under extreme loads and varying temperatures. Its precise metric dimensions make it interchangeable with major brands like SKF, simplifying maintenance.

Built for Heavy-Duty Use: NNU 4938 B/SPW33 Bearing
NNU 4938 B/SPW33 Bearing excels in paper manufacturing equipment, where its high static radial load capacity (198000 lbf) supports consistent performance. The grease or oil lubrication options adapt to different operational needs.

Automotive vs Aerospace: Applications of NNU 4938 B/SPW33 Bearing
In automotive testing rigs, NNU 4938 B/SPW33 Bearing provides reliable precision under combined loads. For aerospace applications, its temperature range (-30° to 110°C) ensures stability in demanding environments.

Where Is NNU 4938 B/SPW33 Bearing Used?
NNU 4938 B/SPW33 Bearing is ideal for robotics, particularly in articulated arms requiring smooth rotation and load distribution. The 69 mm width fits compact spaces without compromising strength.

Q&A

SEND INQUIRY