| Time | Date | Name | Meet |
|---|---|---|---|
| 48.60 | Feb. 23, 2018 | Ryan Drover | SCIAC Championships |
| 49.00 | Feb. 17, 2017 | Ryan Drover | SCIAC Championships |
| 50.34 | Dec. 13, 2014 | Samuel To | California Collegiate Invitational |
| 51.21 | Feb. 18, 2013 | Thomas DePaoli | SCIAC Championships |
| 51.39 | Feb. 21, 2011 | Thomas DePaoli | Southern California Intercollegiate Athletic Conference Championships |
| 51.77 | Feb. 22, 2010 | Thomas DePaoli | Southern California Intercollegiate Athletic Conference Championships |
