8.10 OD Lovejoy 69790442198 HERCUFLEX FX SERIES 42198 FX 4E Steel Rigid Hub 3-15/16 Bore Length Through Bore 4.75 1 x 1/2 Keyway Length Through Bore 4.75 3-15/16 Bore 8.10 OD 1 x 1/2 Keyway LOV   FX 4E HUB RGD 3-15/16 