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SKF
Deep Groove Ball Bearings SKF 6211 -2Z/C3
- Technical data
- Inner diameter
- 55 mm
- Outer diameter
- 100 mm
- Width
- 21 mm
- Material
- Standard bearing steel
- Ball rows
- Single row bearing
- Seal
- Cover on both sides
- Cage
- Sheet steel cage
- Clearance
- Slightly increased radial clearance
- Running accuracy
- Tolerance class P0/PN2 / ABEC 1
- Current insulation
- No current insulation
- Bore
- Cylindrical bore
- Outer ring
- Without flange/groove
- Material of rolling elements
- Standard bearing steel
- Temperature range
- -20 to +120 °C
- Weight
- 0,618 kg
| Scale quantity | Your discount | Unit price |
|---|---|---|
| 25 | 1,19 € | 22,55 € |
| 35 | 2,37 € | 21,37 € |
Deep Groove Ball Bearings SKF 6211 -2Z/C3
The SKF 6211 -2Z/C3 deep-groove ball bearing, measuring 55x100x21 mm, features non-contacting cover plates and increased bearing clearance for industrial applications subject to thermal stress.
The SKF 6211 -2Z/C3 deep groove ball bearing is a single-row radial ball bearing made from standard roller bearing steel (100Cr6) with a bore of 55 mm, an outside diameter of 100 mm and a width of 21 mm. The outer ring is cylindrical, without a flange or groove. As a versatile rolling bearing, this component primarily accommodates radial and moderate axial loads. With its sheet steel cage and factory-fitted gap cover, the component is designed for a temperature range of –20 to +120 degrees Celsius.
What is the 6211-2Z/C3 deep groove ball bearing suitable for in industrial applications?
This rolling bearing is suitable for rotating shafts in industrial applications where clean environmental conditions prevail and low friction is required. The sheet metal covers on both sides ensure that the lubricant remains within the bearing chamber, whilst coarse dirt particles are kept out.
At the same time, the C3 design is well-suited to applications where there are operational temperature differences between the shaft and the housing. Where machine components generate heat during operation or tight fits are required, the additional clearance prevents stress build-up in the bearing.
What features do cover plates and C3 bearing clearance offer in the 6211?
The 2Z version features non-contacting metal cover plates that do not generate any additional frictional heat during operation. This facilitates high speeds whilst providing basic protection against the ingress of coarse particles.
The internal radial bearing clearance of C3 means a slightly increased clearance compared with the standard version. This allows the bearing to compensate for thermal expansion of the shaft or constrictions caused by tight fits. The component complies with standard tolerance class P0 (ABEC 1), which ensures dimensional accuracy in accordance with standards for industrial applications.
What are the dimensions of the 6211-2Z/C3 deep-groove ball bearing?
This model has an internal diameter (bore) of 55 mm, an external diameter of 100 mm and a width of 21 mm. The outer ring is manufactured without a groove or flange, allowing the bearing to fit flush into cylindrical housing bores.
What does the suffix combination -2Z/C3 mean?
The designation 2Z refers to cover plates made of sheet steel fitted on both sides, which act as a non-contact gap cover. The designation C3 indicates a slightly increased radial bearing clearance compared with the standard version. This combination provides protection against coarse foreign objects and prevents jamming due to thermal expansion.
What is the temperature range for which the bearing is designed?
The component is designed for an operating range of -20 to +120 degrees Celsius. Within these temperature limits, the dimensional stability of the rolling elements and the functionality of the sheet steel cage are maintained. For applications outside this range, specific lubricant or material combinations should be investigated.
What is the function of the cover discs (2Z)?
Double-sided cover plates (2Z) act as a non-contact cover, retaining lubricant within the bearing and making it more difficult for coarser particles to penetrate. As there is no abrasive contact with the mating surface, no additional frictional heat is generated, which facilitates use at high speeds.
When is the increased bearing clearance C3 required?
An increased bearing clearance (C3) is selected if the shaft is expected to heat up relative to the bearing housing during operation. It also compensates for the radial compression of the inner ring in the case of tight fits. In the absence of temperature differences or tight fits, the standard bearing clearance class is usually sufficient.
What tolerance class does this roller bearing meet?
The bearing is manufactured to the standard tolerance class P0, which corresponds to the ABEC 1 rating. This tolerance class covers standard requirements in general mechanical engineering and industrial drive bearings. It defines the limit dimensions for the bore, outer diameter and axial runout.
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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