SKF NNU 4940 BK/SPW33
Super-precision double row cylindrical roller bearing with tapered bore and lubrication feature
Dimensions
Abutment dimensions
SKF NNU 4940 BK/SPW33 Super-Precision Bearing Introduction
The NNU 4940 BK/SPW33 is an SKF bearing in the Super-precision cylindrical roller bearings series. Product information identifies it as a double row cylindrical roller bearing with a tapered bore and a lubrication feature.
What type of bearing is the NNU 4940 BK/SPW33?
It is an SKF super-precision, double row cylindrical roller bearing. The supplied data also identifies a tapered bore and lubrication-related design features.
Stated Dimensions and Abutment Data for NNU 4940 BK/SPW33
- Bore diameter d: 200.0 mm
- Outside diameter D: 280.0 mm
- Width B: 80.0 mm
- Shoulder diameter outer ring D1: 252.2 mm
- Raceway diameter inner ring F: 225.0 mm
- Annular lubrication groove width b: 11.1 mm
- Lubrication hole diameter K: 3.0 mm
- Outer ring chamfer r1,2: 2.1 mm
- Inner ring chamfer r3,4: 1.1 mm
- Permissible axial displacement s: 3.7 mm
What abutment dimensions are provided?
The supplied data lists shaft abutment diameters of 211.0 mm and 222.0 mm for the NNU design, a housing abutment diameter of 269.0 mm, a fillet radius of 2.0 mm, and an oil nozzle position dimension dn of 227.0 mm. The oil nozzle position is noted as not for variants with a TNHA cage.
NNU 4940 BK/SPW33 Mass and Supplied Performance Values
The bearing mass is listed as 15.1 kg. The supplied structured values also include 484.0 kN and speed values of 2600.0 r/min and 3000.0 r/min.
Which main measurements should be checked against the installation design?
Installation or selection should be checked against the stated 200.0 mm bore, 280.0 mm outside diameter, 80.0 mm width, relevant chamfer dimensions, abutment dimensions, and permissible axial displacement. Use these supplied values only where they match the intended bearing arrangement.
