| Time | Date | Name | Meet |
|---|---|---|---|
| 54.39 | Feb. 21, 2020 | Mitchell Mages | College Conference of Illinois & Wisconsin Championships |
| 55.47 | Feb. 15, 2019 | Mitchell Mages | College Conference of Illinois & Wisconsin Championships |
| 55.54 | Feb. 10, 2017 | Christopher Riordan | College Conference of Illinois & Wisconsin Championships |
| 56.40 | March 16, 2007 | Zachary Jole | NCAA Division III Mens Championships |
| 56.62 | Feb. 9, 2007 | Zachary Jole | CCIW Championships |
| 56.79 | Feb. 10, 2006 | Zachary Jole | CCIW Swimming Championships |
| 57.16 | Nov. 19, 2005 | Zachary Jole | Minnesota Invitational |
| 57.78 | Feb. 11, 2005 | Zachary Jole | CCIW Championships |
| 59.77 | Feb. 14, 2003 | Henry Somers | CCIW Swimming Championships |
| 1:00.26 | Feb. 14, 2002 | Matt Kolodica | CCIW Championships |
