FAG 239/500-K-MB spherical roller bearing

FAG 239/500-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 239/500-K-MB and any equivalents.

When shaft deflection or slight misalignment between supports is a concern, a self-aligning bearing is often the answer. FAG's K MB series of spherical roller bearings meets this need with a two-row design: the outer ring raceway is spherical, allowing the inner assembly to tilt relative to the shaft without reducing load capacity. These bearings are commonly found in heavy equipment where perfect alignment is difficult to maintain and loads are demanding.

Reading the part number reveals the key features. The first digits indicate the dimension series: 238, 239, and 230 are thin-section series for large diameters. The number after the slash gives the bore diameter in millimeters, as seen in 239/500-K-MB or 230/1000-K-MB. The letter K denotes a tapered bore, and the MB suffix indicates a solid brass cage guided by the inner ring. This pattern holds for other sizes like 238/600-K-MB and 238/850-K-MB.

These bearings are used in gearboxes, mills, crushers, paper machines, large fans, cranes, and material handling equipment—applications where shafts experience combined loads and some deflection. Mounting on a tapered shaft or adapter sleeve simplifies assembly and allows internal clearance to be set. They are also common in cement, steel, oilseed, and mining plants, as well as in the oil and gas sector.

Selection begins with bore diameter and the series that provides the needed load capacity. The K taper requires either an adapter sleeve or a tapered shaft with a controlled fit. Sealing should match the environment: dust, water, or abundant lubricant will influence the choice. Lubrication can be grease or oil, and internal clearance is adjusted during mounting. Proper alignment between supports and correct seating of the spherical outer ring are essential for the bearing to function as self-aligning rather than rigid.

When comparing brands, a spherical roller bearing is identified by its dimensional designation and by the taper and cage suffixes; different manufacturers may use their own letters for the same features. Interchangeability is determined by comparing series, bore diameter, bore type, and cage design, not just the base number. The part number stamped on the bearing or on the equipment drawing is the most reliable reference for requesting a replacement.

For a quote on a FAG spherical roller bearing from this family, send the complete part number via WhatsApp to MR Industrial Accessories, exactly as it appears on the equipment. We will verify the series, bore type, and cage, and respond promptly.