Designed to lock the outboard onto the transom, simply replace on of the mounting nuts with a McGard locking nut. A free spinning collar turns if attacked by gripping tools, protecting against theft and inconvenience. (74049 fits most motors listed and will fit other small outboards with a 5/16" hole in the transom bracket for mounting the motor.)
(A)1/2-20 Merc/Mariner 40+ hp (2-stroke), Mere 25+ hp ( 4-stroke), Suzuki 150-300 hp
(B) M12 x 1.25 Yamaha 40+ hp (2-stroke), 30+ hp (4-stroke), Honda 40+ hp, Suzuki 25-140 hp (2005 & newer)
(C) 1/2-13 Johnson/Evinrude 40+ hp (2-stroke)
(D) 5/16 -18 Honda 8-30 hp, Johnson/Evinrude 6-30 hp, Merc/Mariner 8-25 hp, Nissan 8-18 hp, Suzuki 8-30 hp, Tohatsu 8-18 hp, Yamaha 8-25 hp. May fit other 2-strokes up to 30 hp with 5/16-18 bolts.