The submitter states, “A Raytheon Hawker 800XP...was taxing on a maintenance check at the Teterboro airport when the (L/H) inboard wheel’s outer half separated from the inboard half. The twelve tie-bolts remained on the inboard wheel half and (were) therefore recovered. Only four tie-bolt nuts and two washers were recovered by the Port authority. An internal investigation is still ongoing, but it is suspected the tie-bolt nuts failed (P/N FN22A-524).”