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The 228 series (NU228, NJ228, NUP228) are heavy-duty, single-row cylindrical roller bearings measuring 140 mm (ID) × 250 mm (OD) × 42 mm (Width). Engineered to accommodate exceptionally high radial loads combined with high-speed capabilities, these separable bearings are available in different flange configurations to suit your specific axial location requirements. We supply B2B industrial buyers with customizable cage materials (steel or brass), OEM branding, and secure bulk packaging—contact us for a competitive quotation.
The 228 Series Cylindrical Roller Bearings feature optimized roller geometry that provides maximum load distribution and reduces stress peaks. The linear contact between the cylindrical rollers and the raceways allows these bearings to handle much heavier radial loads than ball bearings of the same size. Their separable design (where either the inner or outer ring can be removed) simplifies mounting and dismounting, especially when tight interference fits are required on both the shaft and housing.
Please use the following data to verify fitment against your equipment's Bill of Materials (BOM).
Item | Specification |
Bearing Designations | NU228, NJ228, NUP228 |
Bearing Type | Single-row cylindrical roller bearing |
Bore diameter (d) | 140 mm |
Outer diameter (D) | 250 mm |
Width (B) | 42 mm |
Weight | ≈ 7.88 kg – 8.5 kg (varies by cage/type) |
Dynamic load rating (C) | ≈ 345 kN (typical base design) |
Static load rating (C0) | ≈ 400 kN (typical base design) |
Clearance | Normal (CN/C0), C3 available upon request |
The prefixes indicate the flange design on the inner and outer rings, determining how the bearing handles axial displacement:
NU228: Two flanges on the outer ring, no flanges on the inner ring. The shaft can move axially in both directions relative to the housing (used as a non-locating bearing).
NJ228: Two flanges on the outer ring, one flange on the inner ring. Can accommodate axial displacement in one direction only.
NUP228: Two flanges on the outer ring, one integral flange and one loose flange ring on the inner ring. Used to locate the shaft axially in both directions (locating bearing).
To meet specific operating environments, we offer these bearings with different cage options:
Steel cage (e.g., ECJ / CJ): Standard stamped steel cage, excellent for general-purpose applications combining high strength with low weight and good lubricant flow.
Brass cage (e.g., EM / M / M1): Machined brass cage, highly recommended for applications involving high speeds, heavy vibrations, or shock loads (e.g., vibrating screens, heavy gearboxes).
Due to their high radial stiffness and load capacity, the 140x250x42 mm cylindrical roller bearings are widely utilized in heavy industrial sectors, including:
Large industrial electric motors and generators.
Heavy-duty gearboxes and transmissions.
Pumps, compressors, and blowers.
Manufacturing plant machinery and rolling mills.
We cater to industrial distributors and OEM equipment manufacturers by offering comprehensive customization. We can apply customer logo markings via laser etching, supply specific internal clearances (like C3 for high-temp running), and arrange packaging "As Customer Required" (from neutral industrial pallets to custom-branded single boxes).
Q1: Can I interchange an NU228 with an NUP228?
A: No. While the basic dimensions (140x250x42) and radial load capacities are the same, they serve different functions. The NU228 allows the shaft to float axially, while the NUP228 locks the shaft in both directions. You must match the original design intent of the machine.
Q2: What does the "E" suffix mean (e.g., NU228E)?
A: The "E" (or EC) suffix denotes an optimized internal design with larger or more rollers, providing a higher load-carrying capacity than the standard design.
Q3: Can I request a sample before a bulk order?
A: Yes, we provide sample bearings so your engineering team can evaluate the cage quality, surface finish, and dimensional accuracy prior to placing wholesale orders.
Q4: Do you offer different precision classes?
A: Standard production is P0 (Normal), but higher precision grades (like P6) are available upon request for high-speed spindle or specialized applications.
The 228 Series Cylindrical Roller Bearings feature optimized roller geometry that provides maximum load distribution and reduces stress peaks. The linear contact between the cylindrical rollers and the raceways allows these bearings to handle much heavier radial loads than ball bearings of the same size. Their separable design (where either the inner or outer ring can be removed) simplifies mounting and dismounting, especially when tight interference fits are required on both the shaft and housing.
Please use the following data to verify fitment against your equipment's Bill of Materials (BOM).
Item | Specification |
Bearing Designations | NU228, NJ228, NUP228 |
Bearing Type | Single-row cylindrical roller bearing |
Bore diameter (d) | 140 mm |
Outer diameter (D) | 250 mm |
Width (B) | 42 mm |
Weight | ≈ 7.88 kg – 8.5 kg (varies by cage/type) |
Dynamic load rating (C) | ≈ 345 kN (typical base design) |
Static load rating (C0) | ≈ 400 kN (typical base design) |
Clearance | Normal (CN/C0), C3 available upon request |
The prefixes indicate the flange design on the inner and outer rings, determining how the bearing handles axial displacement:
NU228: Two flanges on the outer ring, no flanges on the inner ring. The shaft can move axially in both directions relative to the housing (used as a non-locating bearing).
NJ228: Two flanges on the outer ring, one flange on the inner ring. Can accommodate axial displacement in one direction only.
NUP228: Two flanges on the outer ring, one integral flange and one loose flange ring on the inner ring. Used to locate the shaft axially in both directions (locating bearing).
To meet specific operating environments, we offer these bearings with different cage options:
Steel cage (e.g., ECJ / CJ): Standard stamped steel cage, excellent for general-purpose applications combining high strength with low weight and good lubricant flow.
Brass cage (e.g., EM / M / M1): Machined brass cage, highly recommended for applications involving high speeds, heavy vibrations, or shock loads (e.g., vibrating screens, heavy gearboxes).
Due to their high radial stiffness and load capacity, the 140x250x42 mm cylindrical roller bearings are widely utilized in heavy industrial sectors, including:
Large industrial electric motors and generators.
Heavy-duty gearboxes and transmissions.
Pumps, compressors, and blowers.
Manufacturing plant machinery and rolling mills.
We cater to industrial distributors and OEM equipment manufacturers by offering comprehensive customization. We can apply customer logo markings via laser etching, supply specific internal clearances (like C3 for high-temp running), and arrange packaging "As Customer Required" (from neutral industrial pallets to custom-branded single boxes).
Q1: Can I interchange an NU228 with an NUP228?
A: No. While the basic dimensions (140x250x42) and radial load capacities are the same, they serve different functions. The NU228 allows the shaft to float axially, while the NUP228 locks the shaft in both directions. You must match the original design intent of the machine.
Q2: What does the "E" suffix mean (e.g., NU228E)?
A: The "E" (or EC) suffix denotes an optimized internal design with larger or more rollers, providing a higher load-carrying capacity than the standard design.
Q3: Can I request a sample before a bulk order?
A: Yes, we provide sample bearings so your engineering team can evaluate the cage quality, surface finish, and dimensional accuracy prior to placing wholesale orders.
Q4: Do you offer different precision classes?
A: Standard production is P0 (Normal), but higher precision grades (like P6) are available upon request for high-speed spindle or specialized applications.
