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USA Swimming Zone Teams
| Time | Date | Name | Team | Meet |
|---|---|---|---|---|
| 47.92 | March 7, 2020 | Sam Stewart | YMCA Hub Fins | Speedo Champions Series - Cary |
| 49.03 | March 18, 2011 | Ty Stewart | YMCA Hub Fins | NASA Junior National Championship |
| 51.20 | March 20, 2009 | Timmy Dasinger | Sunkist Swim Team | NCSA Junior National Swimming Championships |
| 51.29 | March 21, 2008 | Timmy Dasinger | Sunkist Swim Team | NCSA Junior National Championships |
| 52.07 | March 22, 2005 | John Dasinger | Sunkist Swim Team | NCSA Junior National Championships |
| 52.98 | March 22, 2004 | John Dasinger | Sunkist Swim Team | NCSA Junior National Championships |
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