Of all-metal construction with a semi-monocoque fuselage and fabric covered wings, the XF3J-1 was powered by a 625 hp Wright XR-1510-26 fourteen-cylinder two-row air-cooled radial and carried an armament of two 0.30 in (7.62 mm) synchronized machine guns. Provision was made for two 116 lb (52.6 kg) bombs beneath the wings.
Although offering a good performance, the XF3J-1 was surpassed by the Grumman XF2F-1, and no further development was undertaken. The XF3J-1 was the last of the Berliner-Joyce fighters.
Span: 29 ft 0 in (8,84 m)
Length: 22 ft 11 in (6,98 m)
Height: 10 ft 9 in (3,28 m)
Wing area: 239.6 sq.ft (22.26 sq.m)
Empty weight: 2,717 lb (1,233 kg)
Loaded weight: 4,409 lb (2,000 kg)
Max level speed: 290 mph (336 kmh) at 6,000 ft (1,830 m)
Climb: to 5,000 ft (1,524 m) 2 min 42 sec
Service ceiling: 24,500 ft (7,468 m)
Range: 719 mls (1,157 km)