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FAG spherical roller bearing · FAG 23980-B-K-MB
FAG 23980-B-K-MB spherical roller bearing

FAGBrand we market

FAG 23980-B-K-MB spherical roller bearing

Manufacturer Part Number23980-B-K-MBDimensions: 400 x 540 x 106 mm (d x D x B)23980 bearing: all versions and brands →Also searched as: 23980BKMB · 23980 B K MBFAG 239 series: dimension table →
Brand
FAG
Category
Bearings
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Since 1945 · Martínez, Buenos Aires, Argentina

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How to read FAG 23980-B-K-MB

239Series
Spherical roller bearings, 239 series. For the same bore, each series has a different outside diameter and width.
80Bore
400 mm bore: 80 × 5.
B-K-MBSuffix
FAG suffix: it defines the variant (sealing, cage, internal clearance or other features).

23980 is the standard (ISO) basic designation: it defines the type, the series and the bore.

Description

The FAG 23980-B-K-MB bearing has a 400 mm bore, a 540 mm outside diameter and a 106 mm width (400 x 540 x 106 mm).

FAG 23980-B-K-MB is a reference of spherical roller bearing, within Bearings. Request a quote for 23980-B-K-MB via WhatsApp or email with the quantity you need; we respond promptly with the quote and equivalents.

FAG spherical roller bearings are self-aligning double-row components designed to withstand high radial loads and axial loads in both directions. Their spherical outer raceway and cage allow them to compensate for angular misalignment between shaft and housing, making them ideal for applications with shaft deflection or mountings that cannot guarantee perfect alignment. MR Accesorios Industriales sells this line for mining, cement, steel and other industries that demand robustness and durability.

The designation of these bearings follows a clear scheme. The base number, as in 230/1250-B-K-MB or 238/670-B-K-MB, indicates the size and dimension series. The letter B indicates a modified internal design, with higher load capacity and better lubrication conditions. The letter K indicates a tapered bore (taper 1:12), suitable for mounting on an adapter sleeve or tapered shaft. The suffix MB identifies a machined brass cage, high strength, guided by the inner ring. These variants cover a wide range of requirements.

In Argentine industry, these bearings are used in critical applications: ball and rod mills in mining, rotary kilns and coolers in cement plants, rolling mills in steel plants, paper machines and material handling equipment. Their ability to withstand combined loads and misalignment makes them suitable for long shafts subject to deflection, where other bearing types would fail prematurely. MR Accesorios Industriales sells them to meet these demands.

To select correctly, take into account radial and axial load, rotational speed and environmental conditions. Sealing is key: if there is dust or moisture, consider variants with seals or shields. Lubrication must be adequate, with grease or oil depending on the application. During mounting, check alignment and internal clearance; the tapered bore makes adjustment with an adapter sleeve easier. The brass cage tolerates shocks and vibrations better. Always consult the manufacturer's recommendations for each case.

There are equivalences between brands: spherical roller bearings from other manufacturers with similar designations can be interchanged, but it is essential to verify dimensions, tolerances and load capacity. Not all suffixes match between brands. Therefore, when requesting a quote, provide the complete part number shown on the bearing or on the drawing. At MR Accesorios Industriales we can guide you to find the right option, whether FAG or another brand we sell.

If you need a spherical roller bearing for your equipment, write to us on WhatsApp with the part number or dimensions. At MR Accesorios Industriales we will reply shortly with the quote. Don't wait for it to fail: the right bearing extends the life of your machine.

Dimensions

Boundary dimensions of the basic designation 23980 per ISO 15: 400 x 540 x 106 mm (d x D x B).

Bore
400mm
Outside diameter (D)
540mm
Width (B)
106mm

Same size in SKF and other brands

Pages from other brands with the basic designation 23980: 400 x 540 x 106 mm (d x D x B) per ISO 15.

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 FAG 23980-B-K-MB bearing?
The FAG 23980-B-K-MB bearing has a 400 mm bore, a 540 mm outside diameter and a 106 mm width (400 x 540 x 106 mm). These are the standardised boundary dimensions (ISO 15) of the basic designation 23980.
What does the suffix K mean in a FAG bearing?
The letter K indicates that the bearing has a tapered bore with taper 1:12. This allows it to be mounted on a tapered shaft or with an adapter sleeve, making it easier to adjust internal clearance and secure it.
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 is ideal for heavy applications. If the speed is very high, 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, as long as 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.
Request a quote for 23980-B-K-MB via WhatsApp
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