NU421-XL-M1

The NU421-XL-M1 is a high-performance, single-row cylindrical roller bearing engineered for demanding radial load applications. As part of the X-life series, this unit features optimized raceway surfaces and enhanced internal geometry, which significantly improves its basic dynamic load rating (C_r = 610,000 N) and extends overall service life. Designed as a non-locating bearing, the NU design includes two rigid ribs on the outer ring and a smooth inner ring, allowing for axial displacement of the shaft within the housing. This makes it an ideal choice for high-speed machinery where thermal expansion of the shaft is a factor, such as in large electric motors or industrial gearboxes.

Built for reliability in harsh environments, the NU421-XL-M1 incorporates a robust M1 machined brass cage. Unlike standard pressed steel alternatives, this two-piece, roller-guided brass cage offers superior stability under heavy vibrations and shock loads, ensuring the rollers remain perfectly aligned even at its limiting speed of 4,750 rpm. With a massive 260mm outside diameter and a 105mm bore, this bearing provides the extreme rigidity required for heavy-duty pumps, compressors, and agricultural equipment. Its separable design facilitates easier mounting and maintenance, allowing the inner and outer rings to be installed independently to streamline assembly workflows.

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