SKF NU 304 ECP/C3 cylindrical roller bearing
- Brand
- SKF
- Category
- Bearings
- Subcategory
- Cylindrical roller bearings
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Decoding SKF NU 304 ECP/C3
- NU 3Series
- Cylindrical roller bearings, NU 3 series. Series differ in outside diameter and width even when the bore is the same.
- 04Bore
- Bore 20 mm (04 × 5).
- ECP/C3Suffix
- SKF suffix: identifies the variant, such as seals or shields, cage, internal clearance or other features.
NU 304 is the standard ISO basic designation, which sets the bearing type, series and bore.
Description
SKF NU 304 ECP/C3 measures 20 mm across the bore and 52 mm across the outside diameter; its width is 15 mm (20 x 52 x 15 mm).
SKF NU 304 ECP/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 304 ECP/C3 and any equivalents.
The SKF NU series covers cylindrical roller bearings built to carry heavy radial loads at considerable speed. Cylindrical rollers running in a polyamide cage keep operation precise and dependable in tough industrial service. Machine tools, gearboxes, pumps and power transmission equipment are typical homes for these bearings, where radial capacity and rigidity matter most.
Reading the code NU ... ECP/C3: NU means the outer ring carries two ribs while the inner ring has none, so the shaft can shift axially inside the housing. The digits that follow give the size code within the dimension series. ECP points to an optimized internal design with a polyamide cage and higher-capacity rollers. C3 sets internal radial clearance above normal, which suits interference fits or elevated operating temperatures. In a full code, the number identifies a bearing of that series with these characteristics.
You will find these bearings in metallurgy, cement, food processing and petrochemical plants, among other industries. Gearboxes, centrifugal pumps, compressors, industrial fans and machine tool spindles all rely on them. Their rigidity and their ability to take heavy radial loads make them a fit for gear transmissions and for equipment that demands precision and durability.
Selection depends on the radial load, the rotation speed and the operating environment. Open bearings or versions with protective plates are available according to how much contamination is present. Grease or oil lubrication must be appropriate, with maintenance intervals respected. Mounting calls for precise alignment and correct setting of internal clearance, particularly with a polyamide cage. Because the NU series permits axial displacement, the support configuration deserves attention.
Cylindrical roller bearings from other manufacturers can serve as equivalents when dimensions and tolerances line up. For replacements, check the complete code, suffixes such as ECP and C3 included, so compatibility is assured.
Send the exact bearing code you need by WhatsApp or email to MR Industrial Accessories and the team will reply promptly. They can also suggest equivalents and help you choose.
Dimensions
20 x 52 x 15 mm (d x D x B): boundary dimensions for basic designation NU 304, according to ISO 15.
- Bore
- 20mm
- Outside diameter (D)
- 52mm
- Width (B)
- 15mm
Same size, other brands
Other brands' pages with basic designation NU 304: 20 x 52 x 15 mm (d x D x B) per ISO 15.
- FAGNU304-E-XL-TVP2
- NSKNU304ET
- NTNNU304EA
- RKBNU 304
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 304 ECP/C3 bearing: what are its dimensions?
- SKF NU 304 ECP/C3 measures 20 mm across the bore and 52 mm across the outside diameter; its width is 15 mm (20 x 52 x 15 mm). Those are the boundary dimensions standardized in ISO 15 for basic designation NU 304.
- What does the C3 suffix mean on an SKF NU bearing?
- C3 marks internal radial clearance above normal. It fits cases where high operating temperatures or interference fits would otherwise close up the clearance and make the bearing run too tight.
- Can this bearing accommodate axial displacement?
- Yes. With two ribs on the outer ring and none on the inner ring, the NU design lets the shaft move axially relative to the housing. That suits thermal expansion or any setup that needs axial freedom.
- Where are NU ECP/C3 bearings typically used?
- Gearboxes, pumps, compressors, fans and machine tools are common applications. Their high radial load capacity and rigidity suit gear transmissions and equipment that requires precision and durability.