SKF NJ 228 ECJ/C3 cylindrical roller bearing
- Brand
- SKF
- Category
- Bearings
- Subcategory
- Cylindrical roller bearings
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Decoding SKF NJ 228 ECJ/C3
- NJ 2Series
- Cylindrical roller bearings, NJ 2 series. Series differ in outside diameter and width even when the bore is the same.
- 28Bore
- Bore 140 mm (28 × 5).
- ECJ/C3Suffix
- SKF suffix: identifies the variant, such as seals or shields, cage, internal clearance or other features.
NJ 228 is the standard ISO basic designation, which sets the bearing type, series and bore.
Description
SKF NJ 228 ECJ/C3 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 NJ 228 ECJ/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 NJ 228 ECJ/C3 and any equivalents.
When a shaft has to carry heavy radial force at speed, the SKF NJ series cylindrical roller bearing is a common answer. Rollers running in line contact give the bearing its stiffness and load capacity, which is why machine tools, electric motors and power transmission equipment rely on this design. MR Industrial Accessories LLC supplies this line as part of its SKF bearing range.
Reading the code helps you order correctly. NJ means the inner ring has one rib and the outer ring has two, so the bearing can take axial force in a single direction. The digits after it follow the ISO dimension series and set the size. ECJ describes an optimized version with a stamped steel cage and rollers of higher capacity. The /C... block states the internal radial clearance class; C3 is the increased value, chosen when running temperatures are high or fits are tight. NJ 206 ECJ/C3 and NJ 210 ECJ/C3 are typical examples of this naming.
Typical duty covers gearboxes, pumps, fans, compressors, textile machinery and conveying equipment, plus transmissions and axles in railway and automotive work. Metalworking, food processing, mining and power generation all use this series. Where stiffness and dependable rotation matter, the NJ design fits.
Selection starts with the radial and axial loads, then the speed and the environment. Shaft and housing must be aligned during mounting so the bearing is not stressed beyond its duty. Grease or oil lubrication keeps it running, and the choice of seal or shield depends on how dirty the surroundings are. Consider C3 clearance when thermal expansion or tight fits are expected, and always check shaft and housing tolerances.
For interchangeability, an SKF NJ bearing can be matched by another maker that works to the same ISO designation, for example FAG, NSK or NTN, provided dimensions and radial clearance agree. Check the technical data of the alternative before committing. MR Industrial Accessories LLC can review your application and suggest an equivalent.
To request a quote, send the exact part number from your equipment or drawing by WhatsApp or email. The team replies promptly and can also help you choose a bearing or find an equivalent.
Dimensions
140 x 250 x 42 mm (d x D x B): boundary dimensions for basic designation NJ 228, according to ISO 15.
- Bore
- 140mm
- Outside diameter (D)
- 250mm
- Width (B)
- 42mm
Same size, other brands
Other brands' pages with basic designation NJ 228: 140 x 250 x 42 mm (d x D x B) per ISO 15.
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 NJ 228 ECJ/C3 bearing: what are its dimensions?
- SKF NJ 228 ECJ/C3 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 NJ 228.
- What does the ECJ suffix mean on an NJ bearing?
- It marks an optimized design that uses a stamped steel cage and rollers of higher capacity, which supports greater loads than the standard version.
- When should a bearing with C3 clearance be used?
- C3 is the increased radial clearance class. It suits applications where thermal expansion, interference fits or high speeds are present, since it lowers the risk of seizure.
- Can I replace an SKF NJ bearing with another brand?
- Yes, if the ISO designation matches in dimensions and clearance. FAG, NSK and NTN offer equivalents. Ask MR to confirm the interchange before you install it.