QJ 308 MA

When axial space is tight but bidirectional thrust loads are severe, the QJ 308 MA four-point contact ball bearing offers a highly efficient mechanical solution. Featuring a 40 mm bore, 90 mm outer diameter, and 23 mm width, the compact envelope of the QJ 308 MA delivers a much smaller axial footprint than conventional double-row angular contact bearings without sacrificing load capacity. A major maintenance advantage comes from its split inner ring architecture. This structural setup allows the one-piece outer ring and cage assembly to be mounted completely independently from the inner halves. Under high-speed operations-reaching up to 14,000 r/min-the QJ 308 MA relies on its machined brass cage to minimize frictional heat and withstand high centrifugal forces, making it a reliable fit for demanding compressor, pump, and gearbox applications.

We provide sea and air freight services for large bearings, and international express shipping services for small bearings.

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