SKF 21308 EW/C3 spherical roller bearing
- Brand
- SKF
- Category
- Bearings
- Subcategory
- Spherical roller bearings
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Decoding SKF 21308 EW/C3
- 213Series
- Spherical roller bearings, 213 series. Series differ in outside diameter and width even when the bore is the same.
- 08Bore
- Bore 40 mm (08 × 5).
- EW/C3Suffix
- SKF suffix: identifies the variant, such as seals or shields, cage, internal clearance or other features.
21308 is the standard ISO basic designation, which sets the bearing type, series and bore.
Description
SKF 21308 EW/C3 measures 40 mm across the bore and 90 mm across the outside diameter; its width is 23 mm (40 x 90 x 23 mm).
SKF 21308 EW/C3 belongs to spherical 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 21308 EW/C3 and any equivalents.
When a shaft flexes or the housing is not perfectly aligned, a self-aligning bearing keeps the assembly running. The SKF 21308 EW/C3 is a spherical roller bearing with two rows of rollers, built to carry radial and axial loads in both directions. The code tells you what you are getting: 21308 for the 213 series and its dimension series, EW for the stamped steel cage, and C3 for internal radial clearance above standard. Our team helps you confirm the exact code before you order.
Reading the designation is the first step in getting the right part. The digits 21308 place the bearing in the 213 series and define its dimension series; the EW suffix points to a stamped steel cage; the C3 suffix means internal radial clearance is greater than standard. Put together, 21308 EW/C3 describes a spherical roller bearing with a steel cage and C3 clearance. Suffixes matter as much as the base number, so compare the whole code, not just the first digits.
These bearings show up in demanding US plants: mining, cement, steel, paper and aggregate processing. You will find them on belt conveyors, vibrating screens, ball and hammer mills, high-flow centrifugal pumps and speed reducers. Agricultural equipment and food processing lines also use them, where contamination control matters. Because the design tolerates misalignment, it suits long shafts and shafts supported by structures that deflect under load.
Selection comes down to radial and axial load, speed and the operating environment. In dusty or damp areas, consider sealed or flinger variants. C3 clearance is the usual choice with interference fits or when temperature differences across the bearing are expected. Lubrication also decides service life: a quality grease for high temperatures, or oil in circulating systems. At mounting, check alignment and use controlled impact tools so the rollers are not damaged.
SKF spherical roller bearings interchange with other European, Japanese and American brands that share the same standardized dimensions. On a replacement, compare suffixes too, since cage type, internal clearance and heat treatment can differ from one maker to another. Where space permits, a bronze cage may replace the stamped steel one. Confirm the complete code of the original bearing and let our technical team review it with you.
For a quote on the SKF spherical roller bearing you need, send the full code by WhatsApp or email. We reply promptly and can suggest equivalents or help you choose the right variant.
Dimensions
40 x 90 x 23 mm (d x D x B): boundary dimensions for basic designation 21308, according to ISO 15.
- Bore
- 40mm
- Outside diameter (D)
- 90mm
- Width (B)
- 23mm
Same size, other brands
Other brands' pages with basic designation 21308: 40 x 90 x 23 mm (d x D x B) per ISO 15.
- FAG21308-E1-XL21308-E1-XL-K
- NSK21308EAE421308EAKE4
- NTN21308C21308CK
- RKB21308
- TIMKEN21308EJ
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 21308 EW/C3 bearing: what are its dimensions?
- SKF 21308 EW/C3 measures 40 mm across the bore and 90 mm across the outside diameter; its width is 23 mm (40 x 90 x 23 mm). Those are the boundary dimensions standardized in ISO 15 for basic designation 21308.
- What does C3 mean on a spherical roller bearing?
- C3 identifies internal radial clearance above standard. It is specified when the bearing runs at elevated temperatures or is mounted with interference fits, because the extra clearance offsets thermal expansion and keeps preload from building up.
- Stamped steel cage or bronze cage: which one fits my application?
- The stamped steel cage handles high speeds and moderate loads. A bronze cage resists fatigue and elevated temperatures better, though it can reduce the permissible speed. The operating conditions decide.
- Can this bearing handle shaft misalignment?
- Yes. The self-aligning geometry absorbs angular misalignment, both static and dynamic, which lowers stress on the shaft and housing and supports longer assembly life. It fits equipment where deflection or mounting accuracy is a concern.