NTN 32309CU tapered roller bearing
- Brand
- NTN
- Category
- Bearings
- Subcategory
- Tapered roller bearings
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Decoding NTN 32309CU
- 323Series
- Tapered roller bearings, 323 series. Series differ in outside diameter and width even when the bore is the same.
- 09Bore
- Bore 45 mm (09 × 5).
- CUSuffix
- NTN suffix: identifies the variant, such as seals or shields, cage, internal clearance or other features.
32309 is the standard ISO basic designation, which sets the bearing type, series and bore.
Description
NTN 32309CU measures 45 mm across the bore and 100 mm across the outside diameter; its total width is 38.25 mm (45 x 100 x 38.25 mm).
NTN 32309CU belongs to tapered roller 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 32309CU and any equivalents.
NTN CU series tapered roller bearings are engineered for applications where radial and axial forces act together. The cone and cup geometry provides linear contact that distributes load effectively, making these bearings suitable for equipment with heavy forces and controlled misalignment. They appear in industrial machinery, automotive systems, and transmission equipment. MR Industrial Accessories supplies them to customers across the United States and Latin America.
The CU series code is embedded in the part number. For instance, 32309CU and 32311CU each start with digits that denote the diameter and width series, while the CU suffix identifies a particular design variant in the NTN line. When selecting a bearing, verify the bore diameter, outer diameter, and width required by your equipment. If the exact reference is unclear, our team can help you identify it.
Typical uses include gearboxes, gear cases, transmission shafts, road machinery rollers, mining equipment, cranes, and bridges. In the automotive sector, they are found in wheel hubs and differentials. Their capacity to carry combined loads suits demanding environments with vibration and changing load directions.
Proper selection also involves sealing type, internal clearance, and lubrication. CU series bearings can be mounted in pairs for precise axial adjustment. Maintaining alignment between cone and cup is critical to prevent premature wear. Use the lubricant specified by the equipment manufacturer, and follow mounting procedures with the correct tools to avoid raceway damage.
Tapered roller bearings from different manufacturers are identified by distinct part numbers. If you provide a part number from another brand, we can suggest the equivalent NTN reference. Interchangeability depends on dimensions and tolerances, so always confirm the complete designation. Send us your part number or dimensions via WhatsApp or email, and we will respond promptly with a quote and technical guidance.
Dimensions
45 x 100 x 38.25 mm (d x D x T): boundary dimensions for basic designation 32309, according to ISO 355.
- Bore
- 45mm
- Outside diameter (D)
- 100mm
- Total width (T)
- 38.25mm
SKF and other brands, same size
Other brands' pages with basic designation 32309: 45 x 100 x 38.25 mm (d x D x T) per ISO 355.
What they share are the ISO 355 boundary dimensions, not the specs: seals or shields, internal clearance, cage and load rating may vary with brand and suffix. Every quote is by full part number.
Frequently asked questions
- NTN 32309CU bearing: what are its dimensions?
- NTN 32309CU measures 45 mm across the bore and 100 mm across the outside diameter; its total width is 38.25 mm (45 x 100 x 38.25 mm). Those are the boundary dimensions standardized in ISO 355 for basic designation 32309.
- What does the CU suffix indicate in NTN bearings?
- The CU suffix denotes a specific design variant within the NTN tapered roller bearing line. It may relate to tolerances, angles, or particular treatments. For exact details on your reference, contact us with the complete part number.
- How do I select the correct tapered roller bearing?
- You need the bore, outer diameter, and width, along with load and speed conditions. Also define lubrication and sealing requirements. If you have the original part number, send it to us and we will quote the equivalent NTN reference.
- Can NTN CU series bearings be interchanged with other brands?
- They may be interchangeable if dimensions and tolerances match. Each manufacturer uses its own nomenclature, so verify the full designation. Provide a part number from another brand and we will indicate the corresponding NTN equivalent.