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USA Swimming Zone Teams
| Time | Date | Name | Team | Meet |
|---|---|---|---|---|
| 47.28 | March 11, 2022 | Alex KHNYKIN | Springfield Aquatics (MO) | Speedo Sectionals - Columbia |
| 48.41 | Dec. 20, 2019 | Ben Hines | Berzerker Swimming | OK KMS King Marlin Pro-Am Classic |
| 49.07 | Nov. 23, 2019 | Ben Hines | Berzerker Swimming | OK BAC Turkey Meet |
| 49.21 | Dec. 16, 1999 | Robert O'Bryan | Arkansas Dolphins | 1999 OK Kerr-McGee Elite Pro-Am |
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