SKF NUP 309 ECJ/C3 cylindrical roller bearing
- Brand
- SKF
- Category
- Bearings
- Subcategory
- Cylindrical roller bearings
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Decoding SKF NUP 309 ECJ/C3
- NUP 3Series
- Cylindrical roller bearings, NUP 3 series. Series differ in outside diameter and width even when the bore is the same.
- 09Bore
- Bore 45 mm (09 × 5).
- ECJ/C3Suffix
- SKF suffix: identifies the variant, such as seals or shields, cage, internal clearance or other features.
NUP 309 is the standard ISO basic designation, which sets the bearing type, series and bore.
Description
SKF NUP 309 ECJ/C3 measures 45 mm across the bore and 100 mm across the outside diameter; its width is 25 mm (45 x 100 x 25 mm).
SKF NUP 309 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 NUP 309 ECJ/C3 and any equivalents.
SKF NUP cylindrical roller bearings are engineered for applications where high radial loads and reliable shaft positioning are essential. With a fixed flange on the inner ring and two flanges on the outer ring, these bearings permit axial displacement in both directions while maintaining accurate guidance. They are a practical choice for industrial equipment that demands rigidity and precision.
The NUP design provides a fixed location on the shaft, making it suitable for non-locating positions where thermal expansion of the shaft must be accommodated. The ECJ suffix indicates a high-capacity stamped steel cage, while C3 denotes a radial internal clearance greater than normal. Part numbers such as NUP 309 ECJ/C3 and NUP 310 ECJ/C3 illustrate how these designations combine to meet specific operating conditions.
Typical applications include speed reducers, industrial pumps, large electric motors, and heavy machinery in sectors such as metallurgy, cement, and paper production. In these environments, the bearing's ability to handle heavy radial loads and maintain alignment under continuous operation is a key advantage. Proper selection begins with evaluating the radial load, speed, and ambient conditions.
For installations where thermal expansion or interference fits are expected, a C3 clearance is often recommended. Mounting should be done with appropriate tools to protect the rollers and raceways, and lubrication must be matched to the operating speed and temperature. Correct alignment between shaft and housing is critical to prevent premature wear and additional stress on the bearing.
When replacing an SKF NUP bearing, equivalent parts from other manufacturers may be available, but it is important to verify dimensions, tolerances, and cage type rather than relying solely on the part number. MR Industrial Accessories can help you identify the correct part number or suggest an equivalent based on your application requirements.
Dimensions
45 x 100 x 25 mm (d x D x B): boundary dimensions for basic designation NUP 309, according to ISO 15.
- Bore
- 45mm
- Outside diameter (D)
- 100mm
- Width (B)
- 25mm
Same size, other brands
Other brands' pages with basic designation NUP 309: 45 x 100 x 25 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 NUP 309 ECJ/C3 bearing: what are its dimensions?
- SKF NUP 309 ECJ/C3 measures 45 mm across the bore and 100 mm across the outside diameter; its width is 25 mm (45 x 100 x 25 mm). Those are the boundary dimensions standardized in ISO 15 for basic designation NUP 309.
- What does the ECJ suffix mean on an SKF NUP bearing?
- ECJ indicates a high-capacity stamped steel cage, designed for high loads and high speeds. It is a standard designation in SKF cylindrical roller bearings.
- When should I choose a bearing with C3 clearance?
- C3 clearance is recommended when there is thermal expansion, interference fits, or high speeds, as it provides additional margin to prevent premature seizure.
- Can I replace an SKF NUP bearing with a different brand?
- Yes, if the designation and dimensions match. Brands such as FAG, NSK, or NTN offer equivalents, but verify tolerances and cage type before replacing.