FLENDER Standard Couplings Torsionally Rigid All-Steel Couplings — ARPEX ARS-6 Series © Siemens AG 2015 Further hubs and flanges J hub ■ Selection and ordering data J hubs or jumbo hubs are used where the shaft diameter is greater than the maximum bore diameter of the N hub. Because of the larger hub core diameter "ШND1", the J hub cannot be used as a B hub, i.e. the hub core diameter is greater than the inside diameter of the spacer tube and cannot project into the spacer. The J hub can be combined with any spacer. NL U1 Ш ND1 Ш D1 Ш DA 6 G_MD10_XX_00150 6/20 Siemens MD 10.1 · 2015