Jan 25 (Reuters) - Private equity-backed Hillman Group Inc plans to go public through a merger with billionaire Tilman Fertitta’s blank-check firm in a deal that values the hardware supplier at $2.64 billion. The transaction with Landcadia Holdings III Inc will be supported by a $375 million investment from a fund managed by Columbia Threadneedle Investments and investors led by Wells Capital Management, Hillman parent HMAN Group said on Monday. (Reporting by Sohini Podder in Bengaluru; Editing by Shinjini Ganguli)