SKF NNU 4940 B/SPW33 cylindrical roller bearing
- Brand
- SKF
- Category
- Bearings
- Subcategory
- Cylindrical roller bearings
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Since 1945 · Martínez, Buenos Aires, Argentina
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How to read SKF NNU 4940 B/SPW33
- NNU 49Series
- Cylindrical roller bearings, NNU 49 series. For the same bore, each series has a different outside diameter and width.
- 40Bore
- 200 mm bore: 40 × 5.
- B/SPW33Suffix
- SKF suffix: it defines the variant (sealing, cage, internal clearance or other features).
NNU 4940 is the standard (ISO) basic designation: it defines the type, the series and the bore.
Description
SKF NNU 4940 B/SPW33 is a reference of cylindrical roller bearing, within Bearings. Request a quote for NNU 4940 B/SPW33 via WhatsApp or email with the quantity you need; we respond promptly with the quote and equivalents.
The SKF NNU series cylindrical roller bearing is a component with high radial load capacity, designed to withstand high loads and considerable speeds. Its two-row construction and flangeless inner ring allow some freedom of axial displacement, ideal for applications where the shaft expands due to temperature. It is used in heavy machinery, gearboxes, rolling mills and industrial equipment that demand robustness and precision.
The NNU designation identifies two-row cylindrical roller bearings with a flangeless inner ring and a flanged outer ring. The number that follows, for example 4920, indicates the size and dimensional series. The suffix B indicates a design with a machined brass cage, which provides strength and precise guidance. SPW33 is a combination of special tolerances and high-quality grease lubrication, suitable for severe conditions. Thus, a code such as NNU 4920 B/SPW33 summarizes dimensions, execution and lubrication.
These bearings are used in industries such as steel, cement, mining and pulp, where equipment operates with intense radial loads and moderate to high speeds. They are also present in large gearboxes, gear cases, paper machines and rolling trains. In Argentina, they are common in grinding plants, oil extractors and power transmission systems that require high reliability and long service life.
To select the right bearing, take into account the radial load, rotation speed and environmental conditions. Assembly must be carried out with suitable tools, avoiding direct blows on the rollers. Alignment between shaft and housing is critical to avoid parasitic loads. The lubrication indicated by the SPW33 suffix is already incorporated, but it is essential to respect the relubrication intervals according to the manufacturer. Sealing of the assembly protects against external contaminants.
As for equivalents, SKF NNU series bearings can be interchanged with products from other brands that follow the same dimensional designation, such as FAG, NSK or NTN. However, tolerances and internal clearance may vary between manufacturers, so compatibility must always be verified before replacing. MR Accesorios Industriales carries SKF as a brand, guaranteeing authenticity and the brand's technical support.
If you need a quote for an SKF NNU series cylindrical roller bearing, send the full code on WhatsApp to MR Accesorios Industriales. Our technical team advises you so you can choose the right execution for your application. We provide reliable solutions for Argentine industry.
Dimensions
- Bore
- 200mm
Frequently Asked Questions
- What does the B/SPW33 suffix mean on an NNU bearing?
- The B suffix indicates a machined brass cage, which withstands high temperatures and loads. SPW33 refers to special tolerances and high-quality grease lubrication. Together, they define a robust execution for demanding conditions.
- Does this bearing allow axial displacement?
- Yes, because the inner ring has no flanges, it allows some freedom of axial movement. This is useful when the shaft expands due to temperature, avoiding additional loads on the supports.
- How do I choose between an NNU and another type of roller bearing?
- The NNU is two-row with high radial capacity. If you need to support combined axial loads, evaluate other series. For purely radial loads and axial freedom, the NNU is an efficient option. Ask us on WhatsApp.