| Name | Time | Date | Meet |
|---|---|---|---|
| Peter Mikheyev | 49.51 | March 18, 2016 | NCSA Spring Junior National Championship |
| Peter Mikheyev | 51.32 | March 20, 2015 | NCSA Spring Junior National Championship |
| Patrick Murphy | 52.30 | Dec. 5, 2008 | ConocoPhillips Short Course Championships |
| Alex MacDonald | 53.35 | March 9, 2007 | Speedo Champions Series (Harvard) |
| Alex MacDonald | 54.91 | Jan. 14, 2007 | Swim Your Own Age |
