| Name | Time | Date | Meet |
|---|---|---|---|
| Sammy Sierra | 48.79 | Dec. 10, 2021 | Speedo Winter Junior Championship East |
| Joe Radde | 49.25 | Dec. 11, 2020 | MI OLY Winter Invite |
| Joe Radde | 49.83 | Nov. 15, 2020 | 2020 IN ELK Skypoint Transit Invitational |
| Kyle Morris | 50.00 | March 13, 2016 | Indiana Senior State Championships |
| Kyle Morris | 49.34 | March 15, 2015 | 2015 Indiana Senior Short Course Championships |
| Jonathan Hueni | 50.71 | March 21, 2008 | NCSA Junior National Championships |
| Louis Cavadini | 51.47 | March 14, 2003 | Indiana Senior State |
