| Name | Time | Date | Meet |
|---|---|---|---|
| Cody Bybee | 50.22 | June 27, 2017 | Phillips 66 Summer National Championships |
| Cody Bybee | 50.96 | Aug. 9, 2016 | Speedo Summer Junior National Championships |
| JK Koehler | 51.46 | July 23, 2009 | Speedo Champions Series - Oxford |
| JK Koehler | 52.57 | July 22, 2009 | Speedo Champions Series - Oxford |
| JK Koehler | 53.08 | July 28, 2004 | 2004 Speedo Champions Series - Indiana |
| David Hughes | 53.64 | July 23, 2003 | Speedo Champions Series - Bloomington |
| Jason Piercey | 56.90 | Aug. 5, 2002 | 2002 NCSA Junior National Championship |
