Double Row Super-Precision Cylindrical Roller Bearings NNU 49/670 B/SPW33X

The NNU 49/670 B/SPW33X is a double-row cylindrical roller bearing with a large 670mm bore and 900mm outer diameter, built from tough chrome steel. It handles combined loads up to 1113750 lbf and runs smoothly at speeds up to 1000 RPM.

Its open design allows flexible lubrication with grease or oil, while the double-row construction provides extra 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 heavy machinery like industrial gearboxes or large presses where precision and durability are key.

Weighing 410kg, it’s built for robust performance in demanding environments. Compliant with RoHS and REACH standards for safe use.

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Description

Features

Application

Q&A

Product Parameters

Part Number NNU 49/670 B/SPW33X
Size 670 mm x 900 mm x 230 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 670 mm
Bore Dia Tolerance -0.045mm to 0
Outer Dia 900 mm
Outer Dia Tolerance -0.050mm to 0
Width 230 mm
Width Tolerance -0.75mm to 0
Chamfer Dimension Outer Ring(r1,2)(min.) 6 mm
Permissible Axial Displacement(max.) 6 mm
Ring Material Chrome Steel
Roller Material Chrome Steel
Dynamic Radial Load 1113750 lbf
Static Radial Load 3082500 lbf
Max Speed 1000 rpm
Lubrication Grease, Oil
Temperature Range -30° to 110 °C
RoHS Compliant
REACH Compliant
Weight 410 kg
Width Annular Lubrication Groove Outer Ring(B1) 22.3 mm
Diameter Lubrication Hole (outer Ring) (K) 12 mm
Shoulder Dia Outer Ring 821.2 mm
Raceway Diameter Inner Ring 738 mm

Double Row Super-Precision Cylindrical Roller Bearings NNU 49/670 B/SPW33X dimension drawing

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Features

Performance Features of NNU 49/670 B/SPW33X Bearing

NNU 49/670 B/SPW33X Bearing is built with chrome steel rings and rollers, offering high resistance to combined loads.
Its dynamic radial load capacity reaches 1,113,750 lbf, making it suitable for heavy-duty applications.

The double-row cylindrical design ensures stability and precision in demanding conditions.
With a maximum speed of 1,000 rpm, it balances performance and durability.

NNU 49/670 B/SPW33X Bearing operates efficiently in temperatures ranging from -30° to 110°C.
Its open design allows for easy lubrication with grease or oil, reducing maintenance needs.

The bearing’s large bore diameter of 670 mm accommodates heavy shafts.
Precision tolerances ensure smooth operation and extended service life.

Application

Industrial Uses of NNU 49/670 B/SPW33X Bearing
NNU 49/670 B/SPW33X Bearing is commonly used in heavy industrial machinery, such as large gearboxes and rolling mills, where its double-row design handles high radial and axial loads. The open seal type allows for efficient lubrication, ensuring long service life in demanding conditions.

Where Is NNU 49/670 B/SPW33X Bearing Used?
In wind turbine systems, NNU 49/670 B/SPW33X Bearing provides reliable support for the main shaft, thanks to its high dynamic load capacity. Its chrome steel construction also makes it suitable for harsh outdoor environments.

Built for Heavy-Duty Use: NNU 49/670 B/SPW33X Bearing
NNU 49/670 B/SPW33X Bearing excels in steel production equipment, where its combined load capability and large bore diameter are essential. The grease or oil lubrication options offer flexibility for different operational needs.

Automotive vs Aerospace: Applications of NNU 49/670 B/SPW33X Bearing
While NNU 49/670 B/SPW33X Bearing is too large for most automotive uses, it’s ideal for aerospace applications like landing gear systems, where precision and durability are critical. The high static radial load rating ensures safety under extreme conditions.

Key Fields for NNU 49/670 B/SPW33X Bearing
NNU 49/670 B/SPW33X Bearing is a go-to choice for mining equipment, such as crushers and conveyors, due to its robust construction and tolerance for misalignment. The wide temperature range also makes it versatile for various climates.