| _ | Start at: 17:20. Temperature: 27 C. Humiduty: 66% |
| Final | time | | L | React. | bib | | 1. Abdelmalik Lahoulou |  ALG | 48.67s | NR | 4 | 0.223 | 12 | | 2. Miloud Rahmani | ALG | 49.27s | | 6 | 0.224 | 17 | | 3. Mohamed Sghaier |  TUN | 49.32s | | 5 | 0.200 | 565 | | 4. William Mbevi Mutunga |  KEN | 49.43s | SB | 7 | 0.176 | 315 | | 5. Kurt Couto |  MOZ | 49.55s | | 9 | 0.172 | 367 | | 6. Saber Boukmouche | ALG | 49.87s | | 3 | 0.174 | 5 | | 7. Henry Okorie |  NGR | 50.01s | | 8 | 0.159 | 431 | | 8. Ziem Esau Somda |  BUR | 51.02s | SB | 2 | 0.224 | 53 |
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| Records | | Rec | Athlete | time | Birth | Venue | date | | WR | Kevin Young |  USA | 46.78s | 1966 | Barcelona | 06/08/1992 | | AR | Samuel Matete |  ZAM | 47.10s | 1968 | Zurich | 07/08/1991 | | CR | Amadou Dia Ba |  SEN | 48.03s | | Nairobi | 1987 |
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Heats - Tuesday 15.09 Afternoon session | | First 3 and best 2 progress to Final. |
| Ranking | time | | L | React. | bib | | 1. Abdelmalik Lahoulou | ALG | 50.41s | | 8 | 0.155 | 12 | | 2. Miloud Rahmani | ALG | 50.58s | | 6 | 0.182 | 17 | | 3. Henry Okorie | NGR | 51.07s | | 5 | 0.208 | 431 | | 4. Kiprono Koskei | KEN | 51.18s | | 7 | 0.221 | 309 | | 5. Gerhardus Maritz |  NAM | 51.20s | | 3 | 0.159 | 394 | | 6. Abebe Chala |  ETH | 53.61s | | 4 | 0.191 | 193 |
| Ranking | time | | L | React. | bib | | 1. William Mbevi Mutunga | KEN | 50.23s | | 5 | 0.187 | 315 | | 2. Mohamed Sghaier | TUN | 50.41s | | 3 | 0.215 | 565 | | 3. Kurt Couto | MOZ | 50.47s | | 8 | 0.199 | 367 | | 4. Saber Boukmouche | ALG | 50.61s | | 6 | 0.258 | 5 | | 5. Ziem Esau Somda | BUR | 50.61s | NR | 7 | 0.287 | 53 | | 6. Jean Martin Mbana |  CGO | 54.56s | | 4 | 0.166 | 83 |
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