SKF NUP 218 ECM/C4 cylindrical roller bearing
- Brand
- SKF
- Category
- Bearings
- Subcategory
- Cylindrical roller bearings
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Decoding SKF NUP 218 ECM/C4
- NUP 2Series
- Cylindrical roller bearings, NUP 2 series. Series differ in outside diameter and width even when the bore is the same.
- 18Bore
- Bore 90 mm (18 × 5).
- ECM/C4Suffix
- SKF suffix: identifies the variant, such as seals or shields, cage, internal clearance or other features.
NUP 218 is the standard ISO basic designation, which sets the bearing type, series and bore.
Description
SKF NUP 218 ECM/C4 measures 90 mm across the bore and 160 mm across the outside diameter; its width is 30 mm (90 x 160 x 30 mm).
SKF NUP 218 ECM/C4 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 218 ECM/C4 and any equivalents.
For applications that combine heavy radial loads with the need to locate the shaft in both directions, the SKF NUP series cylindrical roller bearing is a common choice. Its inner ring carries two ribs and the outer ring one, a configuration that provides axial positioning while maintaining high rigidity and running accuracy. These bearings appear in machine tools, gearboxes and other industrial equipment where precision matters.
The NUP designation is only part of the story. Suffixes tell you how a particular bearing is built. Take NUP 215 ECM/C3: 215 is the size, ECM means a machined brass cage, and C3 is an internal radial clearance larger than standard. NUP 218 ECM/C4 uses C4 clearance, which is wider still, for situations where temperature rise or a tight fit would otherwise close up the clearance. NUP 224 ECM/C3 and NUP 308 ECM/C3 follow the same pattern. Once you can read the code, picking the right variant becomes straightforward.
You will find these bearings in gearboxes, milling machine spindles, industrial pumps, fans and power transmission equipment. Their ability to take heavy radial loads and their stiffness suit them to precision work under tough conditions. Industries such as metallurgy, cement, mining, food processing and machine tool building rely on them.
Selecting an NUP bearing means looking at radial and axial load, speed and the operating environment. Mounting should be done with the proper tools, without impacts that could mark rollers or raceways. Grease or oil must match the temperature and speed. Shaft and housing alignment is critical to avoid extra loads. The C3 and C4 suffixes give more internal clearance when thermal expansion or interference fits are expected.
For equivalents, bearings from other makers that share the same dimensional and execution designation can work, provided tolerances and clearance are checked. Always compare the technical data from each manufacturer. MR supplies SKF as one of its brands and can help you choose the right option for your application.
If you need an SKF NUP series cylindrical roller bearing, send the complete part number on WhatsApp or by email. The team replies promptly with a quote and can suggest equivalents or assist with selection.
Dimensions
90 x 160 x 30 mm (d x D x B): boundary dimensions for basic designation NUP 218, according to ISO 15.
- Bore
- 90mm
- Outside diameter (D)
- 160mm
- Width (B)
- 30mm
Same size, other brands
Other brands' pages with basic designation NUP 218: 90 x 160 x 30 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 218 ECM/C4 bearing: what are its dimensions?
- SKF NUP 218 ECM/C4 measures 90 mm across the bore and 160 mm across the outside diameter; its width is 30 mm (90 x 160 x 30 mm). Those are the boundary dimensions standardized in ISO 15 for basic designation NUP 218.
- What does the C3 suffix mean on an NUP bearing?
- C3 indicates an internal radial clearance greater than standard. It is used when high operating temperatures or interference fits would reduce clearance during running, helping to avoid excessive preload.
- What is the difference between the ECM and EC suffixes?
- ECM denotes a one-piece machined brass cage, while EC indicates a stamped steel cage. The brass cage is stronger and is chosen for more demanding applications, but both designs are valid depending on the job.
- Can I replace an SKF NUP bearing with another brand?
- Yes, as long as the dimensional designation and internal clearance match. Brands such as FAG, NSK or NTN offer equivalents. Verify tolerances and specific features to ensure correct operation in your equipment.