Specifications HS.404
- Type: single-barrel automatic cannon
- Caliber: 20 mm × 110 (0.79 in)
- Operation: gas operated
- Length without muzzle brake: 2.32 m (7 ft 7 in)
- Length with muzzle brake: 2.52 m (8 ft 3 in)
- Weight without drum magazine: 43 kg (94 lb 13 oz)
- Weight (complete): 68.7 kg (151 lb 7 oz)
- Rate of fire: 600–700 rpm
- Muzzle velocity: 840 to 880 m/s (2,800 to 2,900 ft/s)
- Recoil force: 400 kg (881.849 lb) with muzzle brake
- Ammunition: Ball, Incendiary, HE (High Explosive)
- Projectile weight: HE and HEI: 130 g (4.6 oz), AP-T: 168 g (5.9 oz)
- HE and HEI rounds explosive filler: 6 to 11 g (0.21 to 0.39 oz)
Read more about this topic: Hispano-Suiza HS.404