NTN NNU4956K cylindrical roller bearing de doble hilera
- Brand
- NTN
- Category
- Bearings
- Subcategory
- Cylindrical roller bearings
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Decoding NTN NNU4956K
- NNU 49Series
- Cylindrical roller bearings, NNU 49 series. Series differ in outside diameter and width even when the bore is the same.
- 56Bore
- Bore 280 mm (56 × 5).
- KSuffix
- NTN suffix: identifies the variant, such as seals or shields, cage, internal clearance or other features.
NNU 4956 is the standard ISO basic designation, which sets the bearing type, series and bore.
Description
NTN NNU4956K belongs to cylindrical roller bearing de doble hilera, 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 NNU4956K and any equivalents.
For equipment that carries heavy radial loads and still demands rigidity, the NTN NNU double row cylindrical roller bearing is a common choice. Its design pairs a flangeless inner ring with a flanged outer ring, and the series covers a wide range of sizes. MR Industrial Accessories LLC supplies this bearing to maintenance and purchasing teams across the United States and several Latin American countries.
Reading the NNU code helps you confirm what you are ordering. The letters NNU identify a double row cylindrical roller bearing: the inner ring has no flange, while the outer ring is flanged. A trailing K means the bore is tapered, which simplifies mounting and adjustment on the shaft. Bore size follows the number that comes after the slash or in the series designation: NNU49/500K has a 500 mm bore, and NNU4920K has a 100 mm bore. Other sizes in the series are available for different shaft diameters.
Typical service includes mining machinery, cement and steel plants, high-precision machine tools, gearboxes and gear units where radial forces are substantial. The bearing also suits milling and drilling spindles that need rigidity at speed. When selecting one, review the radial load, the operating speed and the surrounding conditions. A tapered bore calls for an interference fit on the shaft to keep the assembly secure. Grease or oil lubrication can be used depending on the application, and accurate alignment matters to avoid premature wear. In dirty or contaminated areas, add extra sealing protection.
NTN NNU bearings can be cross-referenced with other brands that use the same international nomenclature. Before substituting, check the principal dimensions and tolerances, because they may differ from one maker to another. The NNU series is widely standardized, so compatible options are usually easy to locate. If you are unsure, send us the part number and we will review it with you.
To get a quote, message the complete bearing part number on WhatsApp or by email. The team replies promptly and can suggest equivalents or help you choose the right variant in the series.
Dimensions
- Bore
- 280mm
Frequently asked questions
- What does the K suffix mean in the NNU designation?
- The K indicates a tapered bore. It allows an interference fit on a tapered shaft, which improves fastening and makes disassembly easier. This is common where high precision and rigidity are required.
- In which applications is a double row NNU bearing recommended?
- It is used in machine tools, mining equipment, cement plants and gearboxes where radial loads are high and rigidity is important. It also appears in milling and drilling spindles that run at considerable speeds.
- How can I request a quote for a specific NNU bearing?
- Send the complete bearing part number by WhatsApp or email to MR Industrial Accessories LLC. We will respond promptly with the quote and the technical information you need. If you cannot find the part number, contact us and we will help identify it.