SKF NU 2256 ECMA/C3 cylindrical roller bearing
- Brand
- SKF
- Category
- Bearings
- Subcategory
- Cylindrical roller bearings
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Decoding SKF NU 2256 ECMA/C3
- NU 22Series
- Cylindrical roller bearings, NU 22 series. Series differ in outside diameter and width even when the bore is the same.
- 56Bore
- Bore 280 mm (56 × 5).
- ECMA/C3Suffix
- SKF suffix: identifies the variant, such as seals or shields, cage, internal clearance or other features.
NU 2256 is the standard ISO basic designation, which sets the bearing type, series and bore.
Description
SKF NU 2256 ECMA/C3 measures 280 mm across the bore and 500 mm across the outside diameter; its width is 130 mm (280 x 500 x 130 mm).
SKF NU 2256 ECMA/C3 belongs to cylindrical 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 NU 2256 ECMA/C3 and any equivalents.
Cylindrical roller bearings in the SKF NU ECMA/C range are built for machinery that carries heavy radial loads at high speed. The machined brass cage, guided by the rollers, keeps the rolling set aligned through demanding duty cycles. MR Industrial Accessories LLC supplies these bearings to plants across the United States and Latin America, and our team can walk you through the code, the clearance and the fit before you order.
Reading the designation helps you confirm you have the right part. NU means the outer ring carries two ribs while the inner ring has none, so the bearing takes radial load only and the shaft can move axially inside it. ECMA points to an optimized internal design with a single-piece machined brass cage guided by the rollers. C3 tells you the internal radial clearance sits above the standard value. Part numbers in this series include NU 2256 ECMA/C3, NU 2348 ECMA/C3 and NU 2356 ECMA/C3; the digits after NU set the bore and the dimension series.
Typical service is in speed reducers, gearboxes, centrifugal pumps, compressors, machine tools, and mining and cement equipment, as well as large electric motors and mill drives. In every one of these, radial load dominates and precision matters, so the bearing has to hold up in severe industrial conditions where uptime depends on it.
Selection comes down to three inputs: radial load, rotational speed and the environment around the bearing. Choose C3 when temperature swings or mounting fits will cause thermal expansion. Match the lubricant to speed and operating temperature, with synthetic products for the higher speed end. During mounting, keep the seat clean and aligned, then verify radial clearance once the bearing is in place. The machined brass cage adds strength and supports higher speeds.
Bearings from other manufacturers with similar designations may interchange, but dimensions and tolerances always need checking. Compare load capacity and internal design rather than the code alone. Our team can review interchangeability and point you to the option that fits your application.
Send the complete part number by WhatsApp or email and we will respond with a quote. If the number is unclear, share your dimensions or describe the application and we will help identify the right bearing.
Dimensions
280 x 500 x 130 mm (d x D x B): boundary dimensions for basic designation NU 2256, according to ISO 15.
- Bore
- 280mm
- Outside diameter (D)
- 500mm
- Width (B)
- 130mm
Same size, other brands
Other brands' pages with basic designation NU 2256: 280 x 500 x 130 mm (d x D x B) per ISO 15.
- FAGNU2256-E-TB-M1
- NTNNU2256
- RKBNU 2256
What they share are the ISO 15 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
- SKF NU 2256 ECMA/C3 bearing: what are its dimensions?
- SKF NU 2256 ECMA/C3 measures 280 mm across the bore and 500 mm across the outside diameter; its width is 130 mm (280 x 500 x 130 mm). Those are the boundary dimensions standardized in ISO 15 for basic designation NU 2256.
- What does C3 mean on an SKF NU ECMA bearing?
- C3 marks an internal radial clearance above the standard value. It suits situations where temperature differences between shaft and housing, or the fits you plan to use, will close up the clearance during operation. Confirm your operating conditions before settling on a clearance class.
- Where do NU ECMA/C3 bearings normally go?
- They show up in gearboxes, pumps, compressors, machine tools and mining equipment, wherever radial load is heavy and speeds are high. Correct mounting and lubrication are what let them perform in those environments.
- How do I get a quote from MR?
- Send the full bearing part number over WhatsApp or email and we will reply with a quote. If you do not have the number handy, we can help identify the bearing from its dimensions or from the application.