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5311 Nachi Double Row Angular Ball Bearings, Made in Japan, the 5311 inner diameter is 55mm, the 5311 outer diameter is 120mm and the 5311 width is 49.2mm.
The construction of this type ball bearing is similar to the adjacent, BACK-TO-BACK mounting of two Single-row Angular Contact ball bearings. Because fewer balls can be inserted per row compared to Single-row Angular Contact ball bearings, a Double-row Angular Contact ball bearing will have less load capacity than an equivalent size/series BACK-TO-BACK set of two Single-row Angular Contact ball bearings. This bearing type can sustain radial, moment and bi-directional axial loads.
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