SKF cylindrical roller bearings are available in a wide range of designs, series, variants, and sizes. The main design differences lie in the number of roller rows, the flanges on the inner and/or outer rings, as well as the design and material of the cage. These bearings are capable of meeting the demands of applications involving heavy radial loads and high rotational speeds. They offer high load-carrying capacity, high rigidity, allowance for axial displacement, low friction, and long service life.
ⅠHow many types of SKF cylindrical roller bearings are there, and which letters correspond to the different structural designs?
They can be classified into the following types according to the number of roller rows and the presence or absence of a cage:
| Prefix | Description |
| N | Inner ring with two flanges, outer ring without flanges. |
| NJ | Outer ring with two flanges, inner ring with a single flange. |
| NU | Outer ring with two flanges, inner ring without flanges. |
| NUP | Outer ring with two flanges, inner ring with a single flange plus a loose flange ring. |
| NJP | Outer ring with two flanges, inner ring with one loose flange ring. |
| NUB | Outer ring with two flanges, inner ring extended on both sides without flanges. |
| NF | Inner ring with two flanges, outer ring with a single flange. |
| Prefix | Description |
| NNCL | Inner ring with three flanges, outer ring without flanges. |
| NNCF | Inner ring with three flanges, outer ring with a single flange. |
| NNC | Inner ring with three flanges, outer ring with two flanges. |
| NNF sealed | Inner ring with three flanges, outer ring with a single flange in the middle. |
NN design: Inner ring with three flanges, outer ring without flanges.
NNU design: Outer ring with three flanges, inner ring without flanges.
NNUP design: Outer ring with three flanges, inner ring with a single flange plus a loose flange ring.
With a cylindrical or tapered bore
Open or sealedNCF design: Inner ring with two flanges, outer ring with a single flange.
NJG design: Outer ring with two flanges, inner ring with a single flange.
Ⅱ SKF cylindrical roller bearing model designation and meaning
SKF cylindrical roller bearing designations use a systematic coding system, which consists of a basic designation with or without one or more prefixes or suffixes, accurately conveying the bearing’s structure, dimensions, and functional features.
Prefix + Basic designation + Suffix
Prefix: Mainly used to indicate bearing assemblies.
Basic designation: The core identifier, including the bearing type, design, and basic dimensions.
Suffix: Indicates design variants, materials, accuracy, and other characteristics; multiple suffixes are arranged in a fixed order.
The meaning of the alphanumeric combinations is as follows:
Bearing type: Letter combinations indicate the bearing type.
Dimension series: The two digits following the letters indicate the dimension series. The first digit represents the width or height series, and the second digit represents the diameter series.
Size: The last two digits of the basic designation indicate the bearing bore code. Multiply the bore code by 5 to obtain the inner diameter. For bearings with an actual bore diameter of 500 mm or larger, the actual dimension is used directly in the designation.
Media Relations :
Tel: 86.156.6578.7336 Email: service@hsnindustrial.com Website: www.rollingparts.com www.hsnbearing.com