The deal is contracted to five years and is believed to be worth in the region of £1,000,000 plus bonuses if the Blades reach the Premiership.
As of next season the Macclesfield based company will replace DeSun of the Blades shirts and the DeSun (John St Stand) will now be renamed Hfs Loans Stand.
Andy Daykin (Commercial Manager) told sufc.co.uk,: "It is an ideal partnership which is set to bring many commercial benefits to both brands."