| Venue: Empire Stadium, London. |
| Final | time | +time | L | t.a. | | 1. United States |  USA | 40.6s | | 3 | 40.7 | | 2. Great Britain |  GBR | 41.3s | +0.71 | 4 | | | 3. Italy |  ITA | 41.5s | +1.01 | 5 | | | 4. Hungary |  HUN | 41.6s | +1.20 | 1 | | | 5. Canada |  CAN | 41.9s | +1.22 | 6 | | | 6. Netherlands |  NED | 41.9s | +1.27 | 2 | |
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Heats - Friday 06.08 | | First 2 from 3 heats progressed to Final. |
| Heat 1 | time | +time | t.a. | | 1. United States | USA | 41.1s | | 41.2 | | 2. Italy | ITA | 41.3s | +0.11 | | | 3. Brazil |  BRA | 42.4s | | | | -. Turkey |  TUR | DQ | | |
| Heat 2 | time | t.a. | | 1. Great Britain | GBR | 41.4s | 41.4 | | 2. Hungary | HUN | 41.4s | | | 3. Australia |  AUS | 41.5s | | | 4. Uruguay |  URU | 42.8s | | | 5. Bermuda |  BER | 45.4s | | | -. Belgium |  BEL | DNF | |
| Heat 3 | time | t.a. | | 1. Netherlands | NED | 41.7s | | | 2. Canada | CAN | 42.3s | | | 3. Argentina |  ARG | 42.4s | | | 4. Iceland |  ISL | 42.9s | | | -. France |  FRA | DNF | |
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