SKF 21308 EKW spherical roller bearing
- Brand
- SKF
- Category
- Bearings
- Subcategory
- Spherical roller bearings
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Decoding SKF 21308 EKW
- 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).
- EKWSuffix
- 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 EKW 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 EKW 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 EKW and any equivalents.
The SKF EKW series is a self-aligning spherical roller bearing that accommodates radial loads and axial loads in both directions. Its two rows of rollers handle shaft angular misalignment, and the tapered bore with lubrication groove simplifies mounting and relubrication. MR Industrial Accessories supplies this series as part of its SKF bearing line.
Reading the EKW designation helps you select the right bearing. E stands for an optimized design with higher load capacity. K means the bore is tapered at 1:12, so it fits a tapered shaft or an adapter sleeve. W indicates a lubrication groove and holes in the outer ring. For example, in 21308 EKW, 21308 defines the size and dimensional series. These suffixes tell you how the bearing mounts and how it is lubricated.
This bearing suits equipment where loads are heavy and alignment is less than ideal. Typical uses include conveyor belts, mills, crushers, vibrating screens, paper machines, large centrifugal pumps, mining equipment, gearboxes and agricultural machinery. In these applications, the ability to tolerate combined forces and minor misalignment helps avoid unplanned downtime.
When selecting a spherical roller bearing, consider the radial and axial loads, the rotation speed and the lubrication method. The K suffix requires an adapter sleeve or a tapered shaft; check the taper and tighten correctly to prevent slippage. The W groove makes relubrication easier, particularly in dirty environments. Initial alignment does not have to be perfect, but internal clearance after mounting must be controlled. Use appropriate tools and follow the manufacturer's lubrication guidance.
Spherical roller bearings with a tapered bore and lubrication groove are offered by several brands under similar, but not identical, designations. Other makers may use suffixes such as K30, K, W33 or C3 for comparable features. Always confirm critical dimensions and tolerances before substituting one brand for another. MR Industrial Accessories can advise on interchangeability and source the part you need.
If you have the bearing part number, send it via WhatsApp to MR Industrial Accessories for a prompt quote. We work with SKF and other brands to help you find the right solution for your equipment. Feel free to ask about mounting options.
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 EKW bearing: what are its dimensions?
- SKF 21308 EKW 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 the EKW suffix mean on an SKF bearing?
- E indicates an optimized design with higher capacity; K, a tapered bore 1:12; W, a lubrication groove and holes in the outer ring. These suffixes define mounting and maintenance.
- Does this bearing need an adapter sleeve?
- Yes, because it has a tapered bore (K suffix), it mounts on a tapered shaft or with a suitable adapter sleeve. Follow the manufacturer's instructions for tightening and internal clearance.
- Where are spherical roller bearings recommended?
- In applications with high radial loads and possible misalignment, such as conveyor belts, mills, crushers and vibrating equipment. Their self-aligning capability reduces wear and extends service life.