| Venue: Empire Stadium, London. |
| Final | time | +time | L | t.a. | | 1. Netherlands |  NED | 47.5s | | 5 | 47.6 | | 2. Australia |  AUS | 47.6s | +0.09 | 1 | | | 3. Canada |  CAN | 47.8s | +0.48 | 2 | | | 4. Great Britain |  GBR | 48.0s | +0.55 | 3 | | | 5. Denmark |  DEN | 48.2s | +0.63 | 6 | | | 6. Austria |  AUT | 49.2s | +1.65 | 4 | |
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Heats - Friday 06.08 | | First 2 from 3 heats progressed to Final. |
| Heat 1 | time | +time | t.a. | | 1. Canada | CAN | 47.9s | | 48.0 | | 2. Australia | AUS | 48.0s | +0.06 | | | 3. France |  FRA | 48.1s | +0.10 | | | 4. Brazil |  BRA | 49.0s | +1.12 | |
| Heat 2 | time | +time | t.a. | | 1. Great Britain | GBR | 48.4s | | 48.4 | | 2. Austria | AUT | 50.0s | +1.81 | | | 3. Chile |  CHI | 51.5s | +3.28 | | | -. Italy |  ITA | DNF | | |
| Heat 3 | time | +time | t.a. | | 1. Netherlands | NED | 47.6s | | 47.6 | | 2. Denmark | DEN | 48.1s | +0.50 | | | 3. United States |  USA | 48.5s | +0.73 | |
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