Outboard motor lock

McGard outboard motor locks are designed to secure the bolt fastening the outboard motor to the boat's transom. Simply replace one of the fitted nuts with a McGard safety nut. The quality and design of the McGard outboard motor locks are identical to our stern drive locks. An attempt to force open the lock causes a loose sleeve to rotate, but the lock itself remains fixed and your motor is protected against theft.


Mercury/Mariner 40 hp and higher (2 stroke)
Mercury 25 hp and higher (4 stroke) 
Suzuki 150–300 hp


Yamaha 40 hp and higher (2 stroke)
Yamaha 30 hp and higher (4 stroke)
Honda 40 hp and higher
Suzuki 25–140 hp (from 2005)

M12 x 1.2574037
Johnson/Evinrude 40 hp and higher (2 stroke)1/2-1374038
*For almost all of the following outboard motors:

Honda 8-20 HP
Johnson/Evinrude 6-30 HP
Mercury/Mariner 8-25 HP
Nissan 8-18 HP
Suzuki 8-30 HP
Tohatsu 8-18 HP
Yamaha 8-25 HP (also suitable for some 2 strokers up to 30 hp; please check the pitch circle diameter)


*Also for other small outboard motors with a 5/16" aperture in the motor's mount (sets include stainless steel bolts)

Nissan 25 hp and higher
Suzuki 25–140 hp (up to 2004)
Tohatsu 25 hp and higher
Johnson/Evinrude 40 hp and higher (4 stroke)
M12 x 1.7574054