SKF NJ 309 ECJ/C3 cylindrical roller bearing
- Brand
- SKF
- Category
- Bearings
- Subcategory
- Cylindrical roller bearings
We respond promptly.
Since 1945 · Martínez, Buenos Aires, Argentina
Request your quote via WhatsApp or email, with the quantity you need.
Other brands in this category
Ask us about alternatives. Equivalence is verified for each reference and application.
Can't find the exact model? Write to us with the part number or model you're looking for: we'll find it and quote it, even if it's not listed in the catalog.
How to read SKF NJ 309 ECJ/C3
- NJ 3Series
- Cylindrical roller bearings, NJ 3 series. For the same bore, each series has a different outside diameter and width.
- 09Bore
- 45 mm bore: 09 × 5.
- ECJ/C3Suffix
- SKF suffix: it defines the variant (sealing, cage, internal clearance or other features).
NJ 309 is the standard (ISO) basic designation: it defines the type, the series and the bore.
Description
The SKF NJ 309 ECJ/C3 bearing has a 45 mm bore, a 100 mm outside diameter and a 25 mm width (45 x 100 x 25 mm).
SKF NJ 309 ECJ/C3 is a reference of cylindrical roller bearing, within Bearings. Request a quote for NJ 309 ECJ/C3 via WhatsApp or email with the quantity you need; we respond promptly with the quote and equivalents.
The SKF NJ series cylindrical roller bearing is a radial bearing with high load capacity, designed to withstand high radial loads and considerable speeds. Its cylindrical roller design provides linear contact, resulting in high rigidity and load capacity. It is used in industrial applications requiring precision and durability, such as machine tools, electric motors and power transmission equipment. MR Accesorios Industriales sells this line as part of its extensive catalog of SKF bearings.
The designation NJ … ECJ/C… is interpreted as follows: NJ indicates a cylindrical roller bearing with one rib on the inner ring and two ribs on the outer ring, which allows it to withstand axial loads in one direction. The number that follows corresponds to the size according to the ISO dimension series. The suffix ECJ indicates an optimized design with a stamped steel cage and higher-capacity rollers. The /C… part indicates the internal radial clearance class, with C3 being increased clearance, suitable for applications with high temperatures or interference fits. Examples such as NJ 206 ECJ/C3 or NJ 210 ECJ/C3 reflect this nomenclature.
These bearings are used in a wide variety of industries in Argentina, such as metalworking, food, mining and power generation. They are common in gearboxes, pumps, fans, compressors, textile machines and conveying equipment. Their ability to withstand heavy radial loads and their rigidity make them ideal for applications where precision and reliability are critical. In the railway and automotive fields they are also used in transmissions and axles.
To correctly select an NJ bearing, it is essential to consider the radial and axial load it will withstand, as well as the rotation speed and environmental conditions. Installation requires precise alignment between the shaft and the housing to avoid additional stresses. Proper lubrication, whether grease or oil, extends service life. Sealing will depend on the environment: in contaminated environments, seals or shields are recommended. C3 radial clearance is advisable when thermal expansion or tight fits are expected. Always verify shaft and housing tolerances.
Regarding equivalences and interchangeability, SKF NJ series bearings can be replaced by products from other brands that follow the same ISO designation, such as FAG, NSK or NTN, as long as dimensions and radial clearance are respected. It is important to verify the technical specifications and quality of the alternative manufacturer. MR Accesorios Industriales offers advice to find the best option for your needs, without compromising performance.
If you need a quote for an SKF NJ cylindrical roller bearing, or any other industrial component, do not hesitate to contact MR Accesorios Industriales. Send the exact part number shown on your equipment or drawing via WhatsApp and we will reply shortly with the information you need for your project.
Dimensions
Boundary dimensions of the basic designation NJ 309 per ISO 15: 45 x 100 x 25 mm (d x D x B).
- Bore
- 45mm
- Outside diameter (D)
- 100mm
- Width (B)
- 25mm
The same size in other brands
Pages from other brands with the basic designation NJ 309: 45 x 100 x 25 mm (d x D x B) per ISO 15.
They share the boundary dimensions set by ISO 15, not the technical data: seals or shields, internal clearance, cage and load rating can differ by brand and suffix. We quote each one by its full part number.
Frequently Asked Questions
- What are the dimensions of the SKF NJ 309 ECJ/C3 bearing?
- The SKF NJ 309 ECJ/C3 bearing has a 45 mm bore, a 100 mm outside diameter and a 25 mm width (45 x 100 x 25 mm). These are the standardised boundary dimensions (ISO 15) of the basic designation NJ 309.
- What does the ECJ suffix mean on an NJ bearing?
- The ECJ suffix indicates an optimized design with a stamped steel cage and higher-capacity rollers. This improves strength and allows higher loads to be supported compared to standard designs.
- When should a bearing with C3 clearance be used?
- C3 radial clearance is advisable in applications where thermal expansion, interference fits or high speeds are expected. It helps prevent seizure and extends bearing service life.
- Can I replace an SKF NJ bearing with another brand?
- Yes, as long as the ISO designation matches in dimensions and clearance. Brands such as FAG, NSK or NTN offer equivalents. Consult MR to verify interchangeability and ensure performance.