| 21 cm Kanone 39 | |
|---|---|
 A 21 cm K 39 in Norway on coastal defense duties | |
| Type | Heavy siege gun |
| Place of origin | Czechoslovakia |
| Service history | |
| In service | 1939–45 |
| Used by | Nazi Germany Turkey Sweden |
| Wars | World War II |
| Production history | |
| Designer | Škoda |
| Manufacturer | Škoda |
| Produced | 1939–44 |
| No. built | 60 |
| Variants | K 39/40, K 39/41 |
| Specifications (21 cm Kanone 39/41) | |
| Mass | 39,800 kg (87,700 lb) |
| Barrel length | 9.53 m (31 ft 3 in) (excludes muzzle brake) |
| Shell | Separate-loading, bagged charge |
| Shell weight | 135 kg (298 lb) |
| Caliber | 210 mm (8.3 in) |
| Breech | Interrupted screw, de Bange obduration |
| Carriage | Box trail |
| Elevation | -4° to +45° |
| Traverse | 360° |
| Rate of fire | 3 rounds in 2 minutes |
| Muzzle velocity | 800–860 m/s (2,600–2,800 ft/s) (K 39 – K 39/40) |
| Maximum firing range | 33 km (36,000 yd) |
| Filling | TNT |
| Filling weight | 18.8–21.7 kg (41 lb 7 oz – 47 lb 13 oz) |
The 21 cm Kanone 39 (K 39) was a Czech-designed heavy gun used by the Germans in the Second World War. Two were built before the Germans occupied Czechoslovakia in March 1939 and seized the rest of the guns and kept it in production for their own use, eventually building a total of 60 guns for themselves. They saw action in Operation Barbarossa, the siege of Odessa, siege of Leningrad and the siege of Sevastopol and were used on coast defence duties.