| Name | Time | Date | Meet |
|---|---|---|---|
| Eddie McConnaha | 55.67 | Dec. 1, 2023 | Carthage Classic |
| David Gonzales | 55.76 | Dec. 2, 2022 | Carthage Classic |
| Brody Beyer | 56.07 | Dec. 3, 2016 | Grinnell Pioneer Classic |
| Brody Beyer | 57.88 | Jan. 16, 2016 | Carroll (WI) vs. Ripon |
| Robert Bonanno | 58.40 | Dec. 5, 2015 | Pioneer Classic |
