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SKF
Cylindrical Roller Bearings SKF RNU203 TN9
- Technical data
- Inner diameter
- 22,9 mm
- Outer diameter
- 40 mm
- Width
- 12 mm
- Roller rows
- Single row bearing
- Seal
- None, open bearing
- Cage
- Polyamide cage
- Clearance
- Normal radial clearance
- Running accuracy
- Dimensional accuracy P0/PN or ABEC 1, running accuracy P6 or ABEC 3
- Current insulation
- No current insulation
- Bore
- Cylindrical bore
- Outer ring
- Without groove/lubrication holes
- Design
- Bearing without inner ring
- Temperature range
- -30 to +120 °C
- Weight
- 0,053 kg
| Scale quantity | Your discount | Unit price |
|---|---|---|
| 25 | 1,25 € | 23,80 € |
| 35 | 2,50 € | 22,55 € |
Cylindrical Roller Bearings SKF RNU203 TN9
The SKF RNU203 TN9 cylindrical roller bearing features a space-saving design without an inner ring, measuring 22.9 x 40 x 12 mm, and is designed for purely radial loads.
The RNU203 TN9 cylindrical roller bearing is a single-row rolling bearing manufactured by SKF, designed without a separate inner ring. The cylindrical rollers run directly on the hardened and ground shaft journal. With a pitch circle diameter of 22.9 mm, an outer diameter of 40 mm and a width of 12 mm, this design is suitable for installation spaces with limited radial clearance. The open bearing has a standard radial clearance and an outer ring without a lubrication groove.
What is the RNU203 TN9 cylindrical roller bearing suitable for?
This radial roller bearing is used in bearing arrangements where high radial forces must be accommodated and radial installation space is limited. By omitting the inner ring, the shaft diameter can be maximised whilst maintaining the same outer diameter, which increases the stiffness of the entire shaft. The open design allows for direct integration into the existing lubrication systems of the surrounding assembly.
What are the benefits of combining a polyamide cage with the RNU design?
The TN9 version is fitted with a polyamide cage. This cage guides the cylindrical rollers evenly, ensuring low friction and smooth running. The design covers a temperature range from -30 to +120 degrees. With dimensional accuracy to tolerance class P0 (ABEC 1) and finer running accuracy to P6 (ABEC 3), the roller bearing supports precise rotational movements. During design, care must be taken to ensure that the shaft is properly hardened and has a suitable surface finish.
What are the distinctive features of the RNU203 TN9 cylindrical roller bearing design?
The RNU series does not have a separate inner ring. The roller cage is guided directly by the outer ring and runs directly on the shaft. This design saves radial space and allows for stiffer shaft diameters whilst maintaining compact housing dimensions.
What are the dimensions of the RNU203 TN9 cylindrical roller bearing?
The bearing has an inner diameter of 22.9 mm for the roller set. The outer diameter is 40 mm and the width is 12 mm. The outer ring is smooth, i.e. without a circumferential groove or separate lubrication holes.
What does the suffix TN9 mean at SKF?
The abbreviation TN9 denotes a polyamide cage. This cage is characterised by low inertia and smooth running properties, and is suitable for operating temperatures ranging from -30 to +120 degrees.
What type of seal does the RNU203 TN9 cylindrical roller bearing have?
This model is designed as an open roller bearing without integrated cover or sealing discs. Sealing against contaminants and moisture, as well as ensuring that the lubricant remains within the bearing, must therefore be achieved via the surrounding structure, for example by means of radial shaft seals in the housing.
What requirements apply to the shaft in the case of bearings without an inner ring?
As the rollers run directly on the shaft, the shaft journal acts as the inner raceway. The surface must be suitably hardened, finely ground and free from damage in order to achieve the roller bearing’s full load-carrying capacity and service life.
What are the bearing’s tolerance classes?
The bearing combines dimensional accuracy in the ‘Normal’ class (P0 or ABEC 1) with increased running accuracy (P6 or ABEC 3). This ensures precise concentricity during operation with standardised mounting dimensions.
SKF Group
Sven Wingquists Gata 2, 415 50 Gothenburg, Sweden
info@skf.com, https://www.skf.com/uk/footer/site-ownership
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