| Time | Date | Name | Meet |
|---|---|---|---|
| 42.73 | Dec. 19, 2021 | Tate Jackson | OK KMS Pro-Am Classic |
| 43.52 | Dec. 10, 2011 | Matt Ellis | Speedo Junior National Championships |
| 46.73 | March 18, 2009 | Nick Allen | NCSA Junior National Swimming Championships |
| 46.78 | Dec. 7, 2008 | Nick Allen | NT COR A Winter Classic |
| 47.50 | March 21, 2007 | Kevin Frankenfeld | NCSA Junior Nationals |
| 48.07 | Jan. 26, 2007 | Anders Storvik | NT COPS A Greater Southwe |
| 48.13 | Dec. 3, 2006 | Kevin Frankenfeld | Gator Holiday Classic |
