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| Time | Date | Name | Team | Meet |
|---|---|---|---|---|
| 49.69 | March 23, 2018 | Ian Finnerty | Indiana University-Bloomington | NCAA Division I Mens Championships |
| 50.72 | Feb. 23, 2018 | Ian Finnerty | Indiana University-Bloomington | Big Ten Conference Championships (M) |
| 51.38 | Feb. 24, 2017 | Ian Finnerty | Indiana University-Bloomington | Big Ten Conference Championships (M) |
| 51.41 | March 27, 2015 | Richard Funk | University of Michigan | NCAA Division I Mens Championships |
| 51.50 | March 1, 2013 | Cody Miller | Indiana University-Bloomington | Big Ten Conference Mens Championships |
| 51.56 | March 15, 2007 | Mike Alexandrov | Northwestern University | NCAA Division I Mens Championships |
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