SKF 3309 A-Z/C3 double row angular contact ball bearing
- Brand
- SKF
- Category
- Bearings
- Subcategory
- Double row angular contact ball bearings
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Decoding SKF 3309 A-Z/C3
- 33Series
- Double row angular contact ball bearings, 33 series. Series differ in outside diameter and width even when the bore is the same.
- 09Bore
- Bore 45 mm (09 × 5).
- A-Z/C3Suffix
- SKF suffix: identifies the variant, such as seals or shields, cage, internal clearance or other features.
3309 is the standard ISO basic designation, which sets the bearing type, series and bore.
Description
SKF 3309 A-Z/C3 measures 45 mm across the bore and 100 mm across the outside diameter; its width is 39.7 mm (45 x 100 x 39.7 mm).
SKF 3309 A-Z/C3 belongs to double row angular contact ball bearing, part of our Bearings range. Tell us how many you need by WhatsApp or email and we'll get back to you promptly with a quote for 3309 A-Z/C3 and any equivalents.
When a machine needs to handle radial and axial forces in both directions within a tight space, a double row angular contact bearing is often the answer. SKF produces this type of bearing, and MR Industrial Accessories LLC supplies it to maintenance and purchasing teams across the United States and Latin America.
The part number 3309 A-Z/C3 breaks down into meaningful segments. The initial digits 3309 identify the bearing type and dimension series. The letter A denotes an internal design change. The Z indicates a stamped steel cage. The suffix /C3 means the internal radial clearance is larger than the standard value, which helps in setups where temperature rise or tight fits could otherwise reduce clearance.
These bearings are common in metalworking, food processing, mining, and petrochemical operations. They appear in machine tool spindles, centrifugal pumps, gearboxes, and compressors. Because they accommodate axial loads in both directions, they suit equipment that demands high precision and rigidity, such as high-speed machining centers or transmission systems with combined loading.
Selecting the right double row angular contact bearing starts with the axial and radial loads it will see, along with speed and ambient conditions. If dust or moisture is present, choose a variant with seals or shields. Lubricant choice must match the operating temperature. During installation, correct alignment is critical to avoid extra stress on the bearing. Also match internal clearance to the fit and expected thermal expansion.
Bearings from different makers may not be directly interchangeable even if they look similar, because dimensions and load ratings can vary. Always check the complete designation and suffixes. SKF is one of the brands MR supplies, and our team can help you compare options. For a quote, send the full part number via WhatsApp or email; we respond quickly and can suggest equivalents or assist with selection.
Dimensions
45 x 100 x 39.7 mm (d x D x B): boundary dimensions for basic designation 3309, according to ISO 15.
- Bore
- 45mm
- Outside diameter (D)
- 100mm
- Width (B)
- 39.7mm
Frequently asked questions
- SKF 3309 A-Z/C3 bearing: what are its dimensions?
- SKF 3309 A-Z/C3 measures 45 mm across the bore and 100 mm across the outside diameter; its width is 39.7 mm (45 x 100 x 39.7 mm). Those are the boundary dimensions standardized in ISO 15 for basic designation 3309.
- What does the C3 suffix mean on an SKF bearing?
- C3 indicates an internal radial clearance greater than standard. It is used when the bearing will run at elevated temperatures or when mounting fits reduce clearance, preventing the bearing from becoming preloaded.
- Does this bearing allow axial loads in both directions?
- Yes, the double row angular contact design supports axial loads in both directions as well as radial loads, making it suitable for combined load applications requiring high rigidity.
- How do I choose between a single row and a double row bearing?
- The double row handles higher axial and radial loads and provides greater rigidity, but it is wider. If space is limited or loads are moderate, a single row bearing may be sufficient. Evaluate load and speed conditions.