NNU4138-M

The NNU4138-M is a high-performance double row cylindrical roller bearing engineered to handle extreme radial loads in demanding industrial environments. Featuring a 190mm bore, 320mm outside diameter, and a substantial 128mm width, this bearing utilizes a dual-row roller configuration to provide significantly higher radial stiffness and load-carrying capacity than standard single-row alternatives. The "M" suffix denotes a machined brass cage, which is roller-centered to ensure stable operation, reduced friction, and superior heat dissipation during high-speed rotation. This robust construction makes it a reliable choice for heavy-duty machinery, such as large electric motors, gearboxes, and metal-processing equipment.

Designed with a separable structure, the NNU4138-M allows for independent installation of the inner and outer rings, greatly simplifying the mounting and maintenance process. Its NNU design features three integral flanges on the outer ring and a smooth, flangeless inner ring, which accommodates axial displacement of the shaft relative to the housing-making it an ideal "non-locating" bearing. To further enhance its service life, the outer ring is typically equipped with a lubrication groove and holes (W33 feature) to facilitate efficient relubrication. Whether used in precision machine tool spindles or heavy industrial drives, this bearing delivers the durability and rotational accuracy required to minimize downtime and optimize equipment performance.

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