BC-3
Vultee Model V.51 with retractable landing gear and a 600hp P&W R-1340-45, one built, not developed.

BT-13
Vultee Model V.54 with fixed undercarriage and a 450hp P&W R-985-25 engine, 300 built.

BT-13A
As BT-13 but fitted with a 450hp R-985-AN-1 engine and minor changes, 6407 built, survivors re-designated T-13A in 1948.

BT-13B
As BT-13A but with a 24-volt electrical system, 1125 built.

BT-15
As BT-13A with a 450hp Wright R-975-11 engine, 1693 built.

XBT-16
One BT-13A was re-built in 1942 by Vidal with an all-plastic fuselage as the XBT-16.

SNV-1
BT-13As for the United States Navy, 1350 transferred from United States Army Air Corps.

SNV-2
BT-13Bs for the United States Navy, 650 transferred from United States Army Air Corps.

T-13A
Surviving BT-13As were re-designated in 1948, due to dual allocation of T-13 with the PT-13 in practice they were still known as the BT-13 to avoid confusion.
BC-3
Vultee Model V.51 with retractable landing gear and a 600hp P&W R-1340-45, one built, not developed.
BT-13
Vultee Model V.54 with fixed undercarriage and a 450hp P&W R-985-25 engine, 300 built.
BT-13A
As BT-13 but fitted with a 450hp R-985-AN-1 engine and minor changes, 6407 built, survivors re-designated T-13A in 1948.
BT-13B
As BT-13A but with a 24-volt electrical system, 1125 built.
BT-15
As BT-13A with a 450hp Wright R-975-11 engine, 1693 built.
XBT-16
One BT-13A was re-built in 1942 by Vidal with an all-plastic fuselage as the XBT-16.
SNV-1
BT-13As for the United States Navy, 1350 transferred from United States Army Air Corps.
SNV-2
BT-13Bs for the United States Navy, 650 transferred from United States Army Air Corps.
T-13A
Surviving BT-13As were re-designated in 1948, due to dual allocation of T-13 with the PT-13 in practice they were still known as the BT-13 to avoid confusion.
Vultee BT-13 Valiant