This self-propelled antitank gun consists of the 7.5 cm Stu. K. 42 (L/70) mounted on a modified Pz. Kpfw. IV chassis.
The vehicle is of all-welded construction except that the fighting compartment roof is bolted. The upper and lower nose plates are interlocked with each other and with the hull sides. The upper nose plate, set at an angle of 45° to the vertical, has a thickness of 80 mm. The lower nose plate, set at an angle of 55° to the vertical, has a thickness of 45 mm. The superstructure front plate is interlocked with the superstructure side plates and additional strength is provided by two brackets which are welded into recesses in the hull sides and bolted to plates welded to the superstructure front.
The crew compartment occupies the front three-quarters of the vehicle and accommodates a crew of five. The remaining quarter houses the engine which is the standard Maybach HL 120 as fitted in the Pz. Kpfw. IV.
The gun, which has no muzzle brake, is ballistically similar to the 7.5 cm Kw. K. 42 as mounted on the Pz. Kpfw. Panther. It is located eight inches to the right of the hull center line. The hydraulic buffer and hydropneumatic recuperator are mounted above the piece, the buffer being on the left. The recoil gear is protected by a cast mantlet with curved outer surfaces. Stowage is provided for 55 rounds of ammunition, all except four being stowed horizontally.
A port is provided in the superstructure front plate to the right of the 7.5 cm gun, behind which is a small machine gun ball mounting, five inches in diameter.
SPECIFICATIONS
| Weight (approx.) | 28 tons | |
| Length | 19 ft., 9 1/2 ins. | |
| Width | 10 ft., 4 /4 ins. | |
| Height | 6 ft., 5 ins. | |
| Ground clearance | 15 ins. | |
| Tread centers | 8 ft., 1 1/4 ins. | |
| Ground contact | 11 ft., 6 ins. | |
| Width of track | 15 ins. | |
| Pitch of track | 4 3/4 ins. | |
| Track links | 98 | |
| Fording depth | 3 ft. | |
| Theoretical radius of action | ||
| Roads | 130 miles | |
| Cross-country | 80 miles | |
| Speed | ||
| Roads | 28 m.p.h. | |
| Cross-country | 15 m.p.h. | |
| Armor | ||
| Superstructure, front | 80 mm at 50° to vertical | |
| Superstructure, sides (fighting compartment) | 40 mm at 30° | |
| Gun Mantlet | 150 mm (rounded) | |
| Upper nose plate | 80 mm at 45° | |
| Lower Nose plate | 45 mm at 55° | |
| Hull sides | 30 mm (vertical) | |
| Armament | 7.5 cm Stu. K. 42 (L/70); one M.G. | |
| Ammunition (Rds.) | 55 | |
| Engine | Maybach HL 120 TRM, 320 hp. | |
| Transmission | Synchromesh—6 speeds forward, 1 reverse | |
| Steering | Epicyclic, clutch brake | |
| Crew | 5 |
German: p. 32.3 (May 1, 1945)