
FAG 231/1000-B-K-MB spherical roller bearing
- Brand
- FAG
- Category
- Bearings
- Subcategory
- Spherical roller bearings
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Decoding FAG 231/1000-B-K-MB
- 231Series
- Spherical roller bearings, 231 series. Series differ in outside diameter and width even when the bore is the same.
- /1000Bore
- Bore: 1000 mm.
- B-K-MBSuffix
- FAG suffix: identifies the variant, such as seals or shields, cage, internal clearance or other features.
231/1000 is the standard ISO basic designation, which sets the bearing type, series and bore.
Description
FAG 231/1000-B-K-MB measures 1000 mm across the bore and 1580 mm across the outside diameter; its width is 462 mm (1000 x 1580 x 462 mm).
FAG 231/1000-B-K-MB 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 231/1000-B-K-MB and any equivalents.
For equipment where shafts flex or alignment is less than perfect, FAG spherical roller bearings offer a self-aligning, double-row solution. They accommodate radial loads and axial loads in both directions. The spherical outer raceway works with the cage to offset angular misalignment between shaft and housing. MR Industrial Accessories LLC supplies this line to mining, cement, steel and other demanding industries across the United States and Latin America.
Reading the part number helps you specify the right variant. Take 230/1250-B-K-MB or 238/670-B-K-MB: the base number covers size and dimension series. A B stands for a modified internal design that improves load capacity and lubrication. A K means a tapered bore with 1:12 taper, so the bearing can go on an adapter sleeve or a tapered shaft. The MB suffix denotes a machined brass cage, guided by the inner ring. These options let you match the bearing to the application.
Typical uses include ball and rod mills in mining, rotary kilns and coolers in cement plants, rolling mills in steel plants, paper machines and material handling equipment. Because the bearing tolerates combined loads and misalignment, it suits long shafts that deflect, where other types might fail early. MR Industrial Accessories LLC supplies these bearings to meet such conditions.
When selecting, review radial and axial load, speed and the environment. Sealing matters if dust or moisture is present; consider sealed or shielded variants. Lubrication with grease or oil must suit the application. During mounting, check alignment and internal clearance; the tapered bore simplifies adjustment with an adapter sleeve. The brass cage handles shock and vibration well. Always follow the manufacturer's recommendations for each case.
Bearings from other makers with similar designations can often interchange, but verify dimensions, tolerances and load capacity first. Suffixes do not always match between brands. So when you request a quote, give the complete part number from the bearing or drawing. We can help you find the right option, whether FAG or another brand we carry.
If you need a spherical roller bearing for your equipment, send the part number or dimensions via WhatsApp or email. We will reply promptly with a quote and can suggest equivalents or help you choose. The right bearing supports the life of your machine.
Dimensions
1000 x 1580 x 462 mm (d x D x B): boundary dimensions for basic designation 231/1000, according to ISO 15.
- Bore
- 1000mm
- Outside diameter (D)
- 1580mm
- Width (B)
- 462mm
Same size, other brands
Other brands' pages with basic designation 231/1000: 1000 x 1580 x 462 mm (d x D x B) per ISO 15.
- RKB231/1000
- TIMKEN231/1000YMB
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
- FAG 231/1000-B-K-MB bearing: what are its dimensions?
- FAG 231/1000-B-K-MB measures 1000 mm across the bore and 1580 mm across the outside diameter; its width is 462 mm (1000 x 1580 x 462 mm). Those are the boundary dimensions standardized in ISO 15 for basic designation 231/1000.
- What does the suffix K mean in a FAG bearing?
- K indicates a tapered bore with 1:12 taper. This allows mounting on a tapered shaft or with an adapter sleeve, which makes adjusting internal clearance and securing the bearing easier.
- How do I choose between an MB brass cage and other cages?
- The machined MB brass cage is robust and better withstands shock loads and vibrations. It suits heavy applications. For very high speeds, evaluate other options. Contact us on WhatsApp for advice based on your equipment.
- Can I replace a bearing from another brand with a FAG one?
- Yes, if dimensions, tolerances and load capacity match. Suffixes may vary between manufacturers. Provide the complete part number and dimensions so we can verify the equivalence before quoting.

