SKF NJ 324 ECM/C4VA301 cylindrical roller bearing
- Brand
- SKF
- Category
- Bearings
- Subcategory
- Cylindrical roller bearings
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Decoding SKF NJ 324 ECM/C4VA301
- NJ 3Series
- Cylindrical roller bearings, NJ 3 series. Series differ in outside diameter and width even when the bore is the same.
- 24Bore
- Bore 120 mm (24 × 5).
- ECM/C4VA301Suffix
- SKF suffix: identifies the variant, such as seals or shields, cage, internal clearance or other features.
NJ 324 is the standard ISO basic designation, which sets the bearing type, series and bore.
Description
SKF NJ 324 ECM/C4VA301 measures 120 mm across the bore and 260 mm across the outside diameter; its width is 55 mm (120 x 260 x 55 mm).
SKF NJ 324 ECM/C4VA301 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 324 ECM/C4VA301 and any equivalents.
For applications that generate high radial loads and demand reliable performance at speed, SKF NJ series cylindrical roller bearings offer a proven solution. These bearings are built to handle demanding conditions in industrial machinery, from gearboxes to pumps and heavy equipment. Their design supports axial guidance in one direction while managing substantial radial forces. At MR, we supply these bearings as part of our SKF line, helping you match the right configuration to your equipment.
Understanding the designation helps when specifying a bearing. The NJ prefix means the bearing has two ribs on the outer ring and one on the inner ring, providing axial location in a single direction. The numeric code that follows—such as 312, 314, or 320—identifies the size series for bore diameter and width. Suffixes add execution details: ECM indicates a one-piece machined brass cage, roller-guided, suited to higher speeds and temperatures. C4 specifies internal radial clearance greater than normal, and VA301 denotes a particular execution specification. Examples like NJ 312 ECM/C4VA301 and NJ 326 ECM/C4VA301 combine these elements.
These bearings appear frequently in steel, cement, mining, paper, and general machinery manufacturing. They are common in speed reducers, gearboxes, centrifugal pumps, compressors, industrial fans, and belt or chain drives. Their ability to absorb high radial loads while operating at moderate to high speeds makes them versatile for continuously stressed rotating equipment.
When selecting an NJ bearing, review the radial load, rotational speed, and operating environment. C4 clearance is beneficial where thermal expansion or interference fits on the shaft or housing are expected. The ECM cage requires proper lubrication—check grease or oil type and relubrication intervals. During installation, confirm shaft and housing alignment, and avoid impacts that could damage rollers or raceways. Use a hydraulic press or induction heater rather than direct hammering.
While SKF NJ bearings can be interchanged with equivalents from other manufacturers that follow the same dimensional and execution designations, tolerances, internal clearance, and cage type may differ. Always verify main dimensions, clearance, and operating conditions before substituting. Interchangeability is possible, but specifications must match the application.
To request a quote, send the complete bearing code via WhatsApp or email to MR. Our team can help you confirm the correct execution and suggest equivalents if needed.
Dimensions
120 x 260 x 55 mm (d x D x B): boundary dimensions for basic designation NJ 324, according to ISO 15.
- Bore
- 120mm
- Outside diameter (D)
- 260mm
- Width (B)
- 55mm
Same size, other brands
Other brands' pages with basic designation NJ 324: 120 x 260 x 55 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 324 ECM/C4VA301 bearing: what are its dimensions?
- SKF NJ 324 ECM/C4VA301 measures 120 mm across the bore and 260 mm across the outside diameter; its width is 55 mm (120 x 260 x 55 mm). Those are the boundary dimensions standardized in ISO 15 for basic designation NJ 324.
- What does the C4 suffix mean in an SKF NJ bearing?
- C4 indicates internal radial clearance greater than normal. It is used when thermal expansion or interference fits could reduce clearance during operation. Verify that the clearance suits your application.
- How should an NJ cylindrical roller bearing be mounted?
- Mount with a hydraulic press or induction heater, applying force only to the ring being fitted. Avoid impacts on rollers or cage. Check shaft and housing alignment and follow lubrication guidelines.
- Can I replace an SKF NJ bearing with another brand?
- Yes, if main dimensions, internal clearance, and cage type are equivalent. Designations vary by manufacturer, so compare technical specifications. Contact us with the original code for help finding a suitable equivalent.