| Time | Date | Name | Meet |
|---|---|---|---|
| 47.13 | March 21, 2024 | Frank Applebaum | NCAA Division III Championship |
| 47.41 | Dec. 2, 2023 | Frank Applebaum | Pomona-Pitzer @ CMS |
| 47.45 | March 17, 2022 | Frank Applebaum | NCAA Division III Championship |
| 47.80 | March 16, 2017 | Matthew Williams | NCAA Division III Championships |
| 48.66 | Feb. 17, 2017 | Matthew Williams | SCIAC Championships |
| 48.74 | Feb. 21, 2015 | Patrick Shultz | SCIAC Championships |
| 49.10 | Feb. 22, 2014 | Patrick Shultz | SCIAC Championships |
| 49.68 | March 24, 2011 | Jordan Lieberman | NCAA Division III Championships |
| 50.19 | Feb. 20, 2011 | Jordan Lieberman | Southern California Intercollegiate Athletic Conference Championships |
| 50.94 | Feb. 22, 2010 | Austin Hallett | Southern California Intercollegiate Athletic Conference Championships |
| 53.76 | Oct. 24, 2009 | Austin Hallett | UC-San Diego vs. Claremont-Mudd-Scripps |
