7.5 cm KwK 42

Design

The increased muzzle velocity and operating pressure of the new gun required a new armour-piercing projectile to be designed. The Panzergranate 39/42 was the result, and apart from the addition of wider driving bands it was otherwise identical to the older 7.5 cm Panzergranate 39. The wider driving bands added a little extra weight, from 6.8 kg for the old Panzergranate 39, to 7.2 kg for the new Panzergranate 39/42.

The gun was fired electrically, the primer being initiated using an electric current rather than a firing pin. The breech operated semi-automatically so that after the gun had fired, the empty shell casing was automatically ejected, and the falling wedge type breech block remained down so that the next round could be loaded. Once the round was loaded the breech closed automatically and the weapon was ready to be fired again. Three different types of ammunition were used: APCBC-HE, APCR and HE.

Data for KwK 42 and Pak 42

• Type: Tank gun (KwK 42), Anti-tank gun (Pak 42)
• Caliber: 7.5 cm
• Shell: 75×640 mm R
• Barrel length in calibres: 70
• Barrel length: 5.250 m
• Breech: semiautomatic, falling wedge
• Weight with muzzle brake and breech: 1000 kg
• Recoil length: 400 mm (normal), 430 mm (maximum)
• Maximum range: 10 km indirect
• Sight: TZF 12 or 12a (Panther), Sfl.ZF 1a (Jagdpanzer IV/70 (A) and (V))

Ammunition

;Panzergranate 39/42 (Pzgr. 39/42)

• Type: Armour Piercing Capped Ballistic Cap, High Explosive
• Projectile weight: 6.8 kg
• Explosive filler: 18 g of phlegmatized RDX
• Round weight: 14.3 kg
• Round length: 893.2 mm
• Cartridge case length: 640 mm
• Muzzle velocity: 935 m/s

;Panzergranate 40 (Hk) (Pzgr. 40/42)

• Type: Armour Piercing, Composite Rigid
• Projectile weight: 4.75 kg
• Round weight: 11.55 kg
• Round length: 875.2 mm
• Cartridge case length: 640 mm
• Muzzle velocity: 1130 m/s

;Sprenggranate 42 (Sprgr. 42)

• Type: High explosive
• Projectile weight: 5.74 kg
• Explosive weight: 0.650 kg (1.66 lb) (2,720 Kilojoules)
• Round weight: 11.14 kg
• Round length: 929.2 mm
• Cartridge case length: 640 mm
• Muzzle velocity: 700 m/s

Penetration comparison

Notes

References

• Gander, Terry and Chamberlain, Peter. Weapons of the Third Reich: An Encyclopedic Survey of All Small Arms, Artillery and Special Weapons of the German Land Forces 1939-1945. New York: Doubleday, 1979
• Hogg, Ian V. German Artillery of World War Two. 2nd corrected edition. Mechanicsville, PA: Stackpole Books, 1997
• Penetration data extracted from a French DoD publication "Le Panther" Ministere de la Guerre, Section Technique de l'Armee, Groupement Auto-Chars, 1947.

References

1. US Army Technical Manual TM9-1985-3, United States Government Printing Office Washington, 1953
2. Jentz, Thomas L.. (1997). "Germanys Panther Tank: The Quest for Combat Supremacy". Schiffer Military History.
3. (2001). "WWII Ballistics: Armor and Gunnery". Overmatch Press.