SKF 21308 EW/C3 spherical roller bearing
- Brand
- SKF
- Category
- Bearings
- Subcategory
- Spherical roller bearings
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Since 1945 · Martínez, Buenos Aires, Argentina
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How to read SKF 21308 EW/C3
- 213Series
- Spherical roller bearings, 213 series. For the same bore, each series has a different outside diameter and width.
- 08Bore
- 40 mm bore: 08 × 5.
- EW/C3Suffix
- SKF suffix: it defines the variant (sealing, cage, internal clearance or other features).
21308 is the standard (ISO) basic designation: it defines the type, the series and the bore.
Description
The SKF 21308 EW/C3 bearing has a 40 mm bore, a 90 mm outside diameter and a 23 mm width (40 x 90 x 23 mm).
SKF 21308 EW/C3 is a reference of spherical roller bearing, within Bearings. Request a quote for 21308 EW/C3 via WhatsApp or email with the quantity you need; we respond promptly with the quote and equivalents.
The SKF spherical roller bearing is a self-aligning component with two rows of rollers that accepts radial and axial loads in both directions, even with misaligned shafts. It is used in equipment where shaft deflection or mounting errors are common, such as conveyor belts, mills, pumps and gearboxes. Its self-aligning design simplifies mounting and extends service life under demanding conditions. At MR Accesorios Industriales we sell it and advise you to choose the correct variant.
The designation of these bearings combines numbers and letters that indicate their geometry and performance. In the 213 series, the first digit indicates the bearing type and the following ones the dimension series; the EW suffix defines the stamped steel cage design, optimized for high speeds and loads. The slash separates the base code from additional variants, such as C3, which establishes an internal radial clearance greater than standard. For example, 21308 EW/C3 identifies a spherical roller bearing with steel cage and C3 clearance. Knowing these suffixes is key to ordering the exact replacement.
In Argentine industry, these bearings are found in mining, cement, steel, paper and aggregate processing equipment. They appear in belt conveyors, vibrating screens, ball and hammer mills, high-flow centrifugal pumps and speed reducers. They are also used in agricultural machinery and food plants, where cleanliness and resistance to contamination are important. Their ability to withstand misalignment makes them ideal for long shafts or shafts mounted in structures that deflect under load.
To select correctly, take into account radial and axial load, rotation speed and environmental conditions. Sealing is critical: in dusty or humid environments, choose variants with seals or flingers. C3 internal clearance is recommended when there are interference fits or thermal gradients. Lubrication must be adequate: high-quality grease for high temperatures or oil in circulation systems. During mounting, verify alignment and use controlled impact tools to avoid damaging the rollers. Poor practice shortens bearing life.
SKF spherical roller bearings are interchangeable with those of other European, Japanese or American brands that follow the same standardized dimensions. When replacing, compare not only the base code but also the suffixes: cage, internal clearance and heat treatment may vary between manufacturers. If space allows, a bronze cage can be an alternative to the stamped steel one. Always verify the complete code of the original bearing and consult our technical team with any questions.
To request a quote for the SKF spherical roller bearing you need, send us the complete code by WhatsApp. At MR Accesorios Industriales we reply with the alternatives. We back every sale with personalized technical advice.
Dimensions
Boundary dimensions of the basic designation 21308 per ISO 15: 40 x 90 x 23 mm (d x D x B).
- Bore
- 40mm
- Outside diameter (D)
- 90mm
- Width (B)
- 23mm
The same size in other brands
Pages from other brands with the 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
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 21308 EW/C3 bearing?
- The SKF 21308 EW/C3 bearing has a 40 mm bore, a 90 mm outside diameter and a 23 mm width (40 x 90 x 23 mm). These are the standardised boundary dimensions (ISO 15) of the basic designation 21308.
- What does the C3 suffix mean in a spherical roller bearing?
- The C3 suffix indicates an internal radial clearance greater than standard. It is used when the bearing operates at elevated temperatures or with interference fits, since it compensates for thermal expansion and prevents excessive preload.
- How do I choose between a stamped steel cage and a bronze one?
- The stamped steel cage is suitable for high speeds and moderate loads. The bronze one offers greater resistance to fatigue and elevated temperatures, but may limit speed. The choice depends on operating conditions.
- Does this bearing allow shaft misalignment?
- Yes, its self-aligning design compensates for static and dynamic angular misalignment. This reduces stresses on the shaft and housing, extending the service life of the assembly. It is ideal for equipment with deflection or imprecise mounting.