| Name | Time | Date | Meet |
|---|---|---|---|
| Christopher Walsh | 56.28 | Feb. 16, 2013 | 2013 Midwest Conference Championships |
| Tyler O'Neill | 56.94 | Feb. 19, 2011 | Midwest Conference Championships |
| Jeff Wickman | 1:05.52 | Dec. 4, 2010 | Pioneer (Grinnell) Invitational |
| Jeff Wickman | 1:06.09 | Jan. 15, 2010 | Grinnell Invitational |
| Jeff Wickman | 1:06.10 | Nov. 15, 2008 | 2008 Monmouth Invitational |
