RKB 239/630 spherical roller bearing
- Brand
- RKB
- Category
- Bearings
- Subcategory
- Spherical roller bearings
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Other brands for this category
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Decoding RKB 239/630
- 239Series
- Spherical roller bearings, 239 series. Series differ in outside diameter and width even when the bore is the same.
- /630Bore
- Bore: 630 mm.
239/630 is the standard ISO basic designation, which sets the bearing type, series and bore.
Description
RKB 239/630 measures 630 mm across the bore and 850 mm across the outside diameter; its width is 165 mm (630 x 850 x 165 mm).
RKB 239/630 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 239/630 and any equivalents.
RKB spherical roller bearings are double-row, self-aligning units that handle radial loads and axial loads in both directions, even when the shaft and housing are not perfectly aligned. They suit heavy equipment where shaft deflection or mounting errors call for self-aligning capability. MR Industrial Accessories supplies this line and helps you select the right part number for your application.
The series designation is based on its main number: examples run from 230/500 to 230/750. The 230 prefix identifies the medium-section spherical roller series, while the digits after the slash give the bore diameter in millimeters. So a 230/500 has a 500 mm bore, a 230/530 has 530 mm, and the remaining sizes follow the same logic. This naming convention makes it easy to spot the size and order the exact replacement.
Typical applications include cement plants, steel mills, crushing plants, mills, high-capacity conveyors, industrial fans and paper machines. In Latin American mining and aggregate operations, these bearings appear in heavy drives where the shaft flexes or the housing is not perfectly aligned. Their self-aligning design lowers the risk of premature failure and simplifies mounting on welded or cast structures.
When selecting a bearing, consider radial and axial load, rotation speed and environmental conditions. Check that the housing and shaft meet the recommended tolerances for self-aligning bearings. Sealing matters: in dusty, wet or particle-laden areas, choose sealed or shielded variants. Lubrication must match temperature and speed—high-viscosity grease or circulating oil as needed. During mounting, align carefully and avoid direct impacts on the rollers.
When replacing a spherical roller bearing, you may find equivalent part numbers from other brands. The 230, 231, 232 and 240 series share standardized dimensions, so a bearing with the same designation from another manufacturer is often interchangeable. Still, verify suffixes for cage, heat treatment or special tolerance, as these can differ between makers. If you are unsure, MR Industrial Accessories can suggest a compatible alternative for your equipment.
To request a quote for the RKB spherical roller bearing you need, send the complete part number or size via WhatsApp or email. The team replies promptly with purchasing options. If you cannot find the exact reference, message us with the model or dimensions and we will quote the size you are looking for.
Dimensions
630 x 850 x 165 mm (d x D x B): boundary dimensions for basic designation 239/630, according to ISO 15.
- Bore
- 630mm
- Outside diameter (D)
- 850mm
- Width (B)
- 165mm
SKF and other brands, same size
Other brands' pages with basic designation 239/630: 630 x 850 x 165 mm (d x D x B) per ISO 15.
- Need the SKF 239/630? We can also quote:239/630 CA/W33239/630 CAK/W33
- FAG239/630-B-MB239/630-B-K-MB
- NSK239/630CAME4239/630CAMKE4
- NTN239/630239/630K
- TIMKEN239/630YMB
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
- RKB 239/630 bearing: what are its dimensions?
- RKB 239/630 measures 630 mm across the bore and 850 mm across the outside diameter; its width is 165 mm (630 x 850 x 165 mm). Those are the boundary dimensions standardized in ISO 15 for basic designation 239/630.
- What does the 230/500 designation mean in a spherical roller bearing?
- The 230 prefix indicates the medium-section spherical roller series, and the number after the slash is the bore diameter in millimeters—500 mm here. The same pattern applies across the series, so the final number tells you the size.
- When should I use a spherical roller bearing instead of a deep groove ball bearing?
- Use one when radial loads are high, axial loads act in both directions, or the shaft and housing are misaligned. The self-aligning capability and higher load capacity suit heavy equipment with flexible shafts or mountings that do not align perfectly.
- How do I request a quote for an RKB bearing from this series?
- Message us on WhatsApp or email with the complete part number or the size you need. We will quote you promptly. If you have another brand's part number, we can also provide the corresponding equivalent.