| Mills bomb | |
|---|---|
 Mills bombs. From left to right : No. 5, No. 23, No. 36 | |
| Type | Hand grenade |
| Place of origin | United Kingdom |
| Service history | |
| In service | 1915–2021 |
| Production history | |
| Designed | 1915 |
| No. built | over 75 million |
| Variants | No. 5; No. 23 Mk I, II and III; No. 36 Mk I; No. 36M Mk I; No. 36 Mk II |
| Specifications | |
| Mass | 765 g (1 lb 11.0 oz) |
| Length | 95.2 mm (3.75 in) |
| Diameter | 61 mm (2.4 in) |
| Filling | Baratol |
Detonation mechanism | Percussion cap and time delay fuse: 7 seconds, later reduced to 4 |
"Mills bomb" is the popular name for a series of British hand grenades which were designed by William Mills. They were the first modern fragmentation grenades used by the British Army and saw widespread use in the First and Second World Wars.