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USA Swimming Zone Teams
| Time | Date | Name | Team | Meet |
|---|---|---|---|---|
| 51.39 | Aug. 8, 2015 | Jake Rollo | Walnut Creek Aquabears | PC WCAB SCY SUMR |
| 51.54 | March 29, 2014 | Filipe Medeiros | Santa Clara Swim Club | NASA Junior National Championship |
| 52.30 | Oct. 27, 2001 | Erik Scalise | Reno Aquatic Club | PC RENO SCY INVITATIONAL |
| 56.82 | June 26, 1999 | JEFF D. MAYNOR | Carson Tigersharks | 1999 PC DDST SCY INVITATIONAL |
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