Here's every occasion the club have broken their record over the last twenty years, based on estimated fees...
5. 2006 - Ade Akinbiyi £2.2m
Fee: £2.2m. Four goals in two seasons was a less than impressive tally for the Nigeria international, who ended up going back to Burnley. Photo: Matthew Lewis
6. 2006 - Claude Davis
Fee: £3m. The Jamaica international spent a season with United, before Derby County snapped him up for the same fee the following year. Photo: Ross Kinnaird
7. 2007 - James Beattie
Fee: £4m. This proved to be an excellent piece of business from the Blades, as the England international netted 34 goals in 65 games for the club. Photo: Matthew Lewis
8. 2018 – John Egan
Fee: £4.1m. The Republic of Ireland international was on fire for the Blades last season, and will be looking to excel in the top tier this year. Photo: Aitor Alcalde