SKF NU 228 ECJ cylindrical roller bearing
- Brand
- SKF
- Category
- Bearings
- Subcategory
- Cylindrical roller bearings
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Decoding SKF NU 228 ECJ
- NU 2Series
- Cylindrical roller bearings, NU 2 series. Series differ in outside diameter and width even when the bore is the same.
- 28Bore
- Bore 140 mm (28 × 5).
- ECJSuffix
- SKF suffix: identifies the variant, such as seals or shields, cage, internal clearance or other features.
NU 228 is the standard ISO basic designation, which sets the bearing type, series and bore.
Description
SKF NU 228 ECJ measures 140 mm across the bore and 250 mm across the outside diameter; its width is 42 mm (140 x 250 x 42 mm).
SKF NU 228 ECJ 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 228 ECJ and any equivalents.
SKF NU..ECJ cylindrical roller bearings are built for machinery that carries heavy radial loads at considerable speed. Because the rings separate, the bearing is easy to mount and inspect, and the arrangement of ribs on the outer ring gives the shaft axial guidance where it is needed. You will find this series in industrial machinery, electric motors, pumps and transmission equipment. MR Industrial Accessories LLC supplies it as part of its SKF bearing line.
Reading the designation helps you confirm you are ordering the right piece. NU tells you the outer ring carries two ribs while the inner ring has none, so the two rings can shift axially relative to each other. The digits that follow set the size: the first pair relates to bore diameter and the final digit to the dimension series. ECJ points to an optimized internal design with a stamped steel cage, which lowers friction.
Typical service includes metallurgy, cement, paper and food processing. Large electric motors, gearboxes, centrifugal pumps, industrial fans and machine tools are common homes for these bearings. Their rigidity suits gear and belt drives, and they also appear in mining equipment, aggregate plants and automated production lines.
Selection comes down to radial load, speed and the environment around the bearing. Check that shaft and housing tolerances and alignment are correct before mounting. Grease or oil both work as lubricants; oil with a cooling circuit is the usual choice where speeds run high. How much dust or moisture is present decides whether you need seals or protective plates. Internal clearance should match the working temperature and the fit.
If you want help matching a bearing to your application, send the part number or the dimensions to MR Industrial Accessories LLC by WhatsApp or email. The team answers promptly, can point you to equivalent options and assists with the selection.
Dimensions
140 x 250 x 42 mm (d x D x B): boundary dimensions for basic designation NU 228, according to ISO 15.
- Bore
- 140mm
- Outside diameter (D)
- 250mm
- Width (B)
- 42mm
Same size, other brands
Other brands' pages with basic designation NU 228: 140 x 250 x 42 mm (d x D x B) per ISO 15.
- FAGNU228-E-XL-M1
- NSKNU228EM
- NTNNU228NU228E
- RKBNU 228
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 228 ECJ bearing: what are its dimensions?
- SKF NU 228 ECJ measures 140 mm across the bore and 250 mm across the outside diameter; its width is 42 mm (140 x 250 x 42 mm). Those are the boundary dimensions standardized in ISO 15 for basic designation NU 228.
- What does the ECJ suffix indicate?
- It marks an optimized design with a stamped steel cage. The optimized geometry and the cage together reduce friction in operation.
- Can this bearing take axial load?
- No. With two ribs on the outer ring and none on the inner ring, an NU bearing carries radial load only. Where axial load is present, pair it with another bearing or use a design with additional ribs.
- Grease or oil?
- It depends on speed and temperature. High speeds or elevated temperatures call for oil and a circulation system; grease is enough for moderate speeds under normal conditions.