No. 73 grenade
| No. 73 | |
|---|---|
Hand percussion grenade (anti-tank No. 73 Mark I) | |
| Type | Anti-tank grenade |
| Place of origin | United Kingdom |
| Service history | |
| In service | 1940–1941 1943–?1945 |
| Used by | United Kingdom |
| Wars | Second World War |
| Specifications | |
| Mass | 4.5 pounds (2.0 kg) |
| Length | 11 inches (280 mm) |
| Diameter | 3.5 inches (89 mm) |
| Filling | Polar ammonal gelatine dynamite or nitrogelatine |
| Filling weight | 3.5 pounds (1.6 kg) |
Detonation mechanism | Impact |
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The No. 73 grenade, also known as the "Thermos", "Woolworth bomb", or "hand percussion grenade", was a British anti-tank grenade used during the Second World War. It got its nickname from the resemblance to a Thermos flask.