5 cm KwK 38

The 5 cm KwK 38 L/42 (5 cm Kampfwagenkanone 38 L/42) was a German 50 mm calibre cannon used as the main armament of variants of the German Panzer III medium tank during the Second World War. The towed anti-tank gun equivalent was the PaK.37 of which 2,600 were produced from 1937 until 1940.

History
The Panzer III was intended to fight other tanks; in the initial design stage a 50 mm gun was specified. However, the infantry at the time were being equipped with the 37 mm 3.7 cm PaK 36, and it was thought that, in the interest of standardization, the tanks should carry the same armament. As a compromise, the turret ring was made large enough to accommodate a 50 mm gun should a future upgrade be required. This single decision later assured the Panzer III a prolonged life in the German Army.

The early Panzer III Ausf. A to early Ausf. G were equipped with a 3.7 cm KwK 36 L/45, which proved adequate during the campaigns of 1939 and 1940. In response to increasingly better armed and armored opponents, the later Panzer III Ausf. F to Ausf. J were upgraded with the 5 cm KwK 38 L/42. And the later Panzer III Ausf. J¹ to M went with the longer 5 cm KwK 39 L/60 gun.

Ammunition
Average penetration performance established against rolled homogenous steel armour plate laid back at 30° from the vertical.


 * PzGr (Armour Piercing)
 * Weight of projectile: 2.06 kg
 * Muzzle velocity: 685 m/s


 * PzGr. 39 (Armour-piercing, capped, ballistic cap)
 * Weight of projectile: 2.06 kg
 * Muzzle velocity: 685 m/s


 * PzGr. 40 (Armour-piercing, composite, rigid)
 * Weight of projectile: 0.925 kg
 * Muzzle velocity: 1050 m/s

Vehicles mounted on

 * Panzerr III (Sd. Kfz. 141) - Ausf. F to J (serial production), several earlier models were re-equipped with this gun.
 * VK 20 series proposed replacement of the Panzer III and IV

Weapons of comparable role, performance and era

 * Ordnance QF 2-pounder: British 40mm tank and anti-tank gun
 * 45 mm anti-tank gun M1932 (19-K): Soviet tank gun
 * 37 mm gun M3: US tank gun