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Inner ring (sleeve) IR 253026.5 JNS, Japan. Fits needle roller bearing without RNA inner ring. Metric series of dimensions (dxDxT): 25x30x26.5mm.
Inner ring (sleeve) IR 404520 JNS, Japan. Fits needle roller bearing without RNA inner ring. Metric series of dimensions (dxDxT): 40x45x20mm.
Inner ring (bushing) IR12x15x16.5 NTN, Japan. Suitable for needle roller bearings, which are designated NA when assembled with a bushing. Metric series of sizes (dxFxC): 12x15x16.5mm.
Designation: IR20x24x20 SKF IR20x24x20-XL Schaeffler Design: Inner ring / Inner bush / Inner cage of bearings - type IR - looks like steel cylinder. It use with radial bearings us additional inner ring. Features: - precision machined - minimal tolerance of raceway
Inner ring (sleeve) IR50x60x40 China, China. Fits needle roller bearing without inner ring. Metric series of dimensions (dxFxC): 50x60x40mm.