SKF NNU 4972 BK/SPW33
Super-precision double row cylindrical roller bearing with tapered bore and lubrication feature
Dimensions
Abutment dimensions
SKF NNU 4972 BK/SPW33 Super-Precision Cylindrical Roller Bearing
The NNU 4972 BK/SPW33 is an SKF bearing in the Super-precision cylindrical roller bearings series. Product data identifies it as a double row cylindrical roller bearing with a tapered bore and a lubrication feature.
What type of bearing is the NNU 4972 BK/SPW33?
It is an SKF super-precision, double row cylindrical roller bearing. The category path places it within super-precision cylindrical roller bearings, and the product title notes the tapered bore and lubrication feature.
Stated Dimensions and Mass for the NNU 4972 BK/SPW33
The supplied dimensional data lists the bearing as follows:
- Bore diameter d: 360.0 mm
- Outside diameter D: 480.0 mm
- Width B: 118.0 mm
- Shoulder diameter, outer ring D1: 439.0 mm
- Raceway diameter, inner ring F: 399.0 mm
- Annular lubrication groove width b: 16.7 mm
- Lubrication hole diameter K: 9.0 mm
- Outer ring chamfer r1,2: 3.0 mm
- Inner ring chamfer r3,4: 6.0 mm
- Permissible axial displacement s: 5.5 mm
- Mass: 57.9 kg
What abutment dimensions are provided?
The product data lists shaft abutment diameters of 373.0 mm and 395.0 mm for the NNU design, a housing abutment diameter of 467.0 mm, and a fillet radius of 2.5 mm.
Performance and Design Data Supplied for the Bearing
The supplied performance values include a 1120.0 kN figure and speed figures of 1500.0 r/min and 1700.0 r/min. The bearing data also includes an annular lubrication groove in the outer ring and a lubrication hole.
What design features are identified in the product data?
The bearing is described as having a double row cylindrical roller arrangement, a tapered bore, an outer-ring annular lubrication groove, and a lubrication hole. These details reflect the supplied product information rather than additional application claims.
